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Jehbco: From little things, big things grow

Jehbco: From little things, big things grow

Local Beaches company Jehbco Manufacturing Pty Ltd – whose products are used worldwide in almost every industry imaginable – is celebrating its 50th year.

Originating in an unassuming factory in Brookvale, you’ll find little pieces of this third-generation family-run company in planes, trains and automobiles, boats, buildings, restaurants, hospitals and research facilities all around the world.

Founded on the northern beaches in 1974 by partners Jim, Eric, Hank and Burt (their initials forming the company name), Jehbco is a world-leading manufacturer of quality silicone extrusions that are fire, UV, oil, heat and weather resistant, for industries such as mining, pharmaceutical, construction, defence and transport.

Since 1974 the business has grown from a small rented space with one extruder and mill at 52 Winbourne Road to a fully equipped factory at 24 William Street.

The company’s first 10 years were demanding – three of the founding partners were bought out by Hank Tuynman, and he and his wife Janice became business partners.

“It was emotionally and financially challenging in those first few years as we had three small children under five when the idea was first mooted,” explained Janice.

“But through sheer hard work, expertise and entrepreneurial skills, Hank strengthened the original concept to build the business up to what it is today, reinforced by our son Karl,” she said.

Three generations of the Tuynman family are currently involved in the business – Janice who become sole owner when Hank passed away in 2015, their son Karl (who started in accounts in 2000 before moving into production and now Operations Manager); and grandchildren Jacob, who has progressed from the factory to Sales Manager, and Kailey who is the HR, Marketing and Admin Assistant.

Hank and Janice’s other sons, Keith, David and Samuel have also worked at Jehbco over the years and half of its 20 current employees have been with the company for two decades or more.

figure 2

 

CORE VALUES

While there have been major shifts in the manufacturing sector, being a small business has allowed Jehbco to be dynamic and agile, reacting to changes within industries quickly.

“Our core product range has not changed a lot over the past 50 years,” said Karl Tuynman.

“We have always specialised in the production of HTV silicone extrusions and gaskets, staying true to my father’s philosophy that we never produce other rubber products in-house to avoid any chance of cross contamination, something our high-end food and medical grade customers appreciate to meet the high specifications they require,” he said.

Specialist milling silicone rubber

Specialist milling silicone rubber

As demands for certain products changed over time, the company narrowed its focus and strengthened its reputation in its niche market, including silicone sheet and mouldings.

“At the same time, we have developed specialised material formulas for the rail, construction, lighting and drinking water industries that have enabled us to create stable and long-term mutually beneficial partnerships with our customer base,” Karl said.

Jehbco’s vision is “To empower global industries with next-gen silicone extrusions”.

“We export about 15 per cent of our product to countries like the US, China, Singapore, and New Zealand. Our brand is very well known throughout the Asia Pacific Region, selling to companies like Boeing, Fonterra, Zip (Culligan) and ANSTO” Karl said.

“Our products provide innovative solutions including in construction, where we provide Quickjoint – a precured façade extrusion which can be installed at any time and temperature with no skill, unlike its wet silicone alternative.”

“Also, we have developed high-end flame-retardant silicones for the transport industry and in particular for rail.”

“Our high-grade silicone tubing allows companies within

Australia to access this product in any size and grade.”

“We keep abundant supplies of the raw material for our customers as it is unavailable in Australia and has long lead times.”

THE FUTURE

Kailey and Anju

Kailey and Anju

The Australian manufacturing sector has faced its share of challenges over the years with small businesses constantly facing various headwinds.

“We are the last of a dying breed, so it is essential we do whatever it takes to play our part in keeping manufacturing alive in this country,” Karl said

“We are proud to be all-Australian and find this helps with support for many local businesses who are keen to invest in this great nation.

“Many of our very good customers are helping Jehbco continually improve through their ever-increasing demands on upgrading our processes and product quality.

“We are growing with them and will continue to do so, with no foreseeable alternative product on the horizon.

“Every aspect of the business is working together with a common goal to make this the best company it can be, with each key position now filled with motivated and driven employees who have many years of expertise between them.

“I am very optimistic for the future and can see Jehbco being a market force for many years to come, continuing my father’s legacy that he set in motion for us half a century ago,” Karl said.

 

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Optimising Silicone Extrusion Cutting with Gillard Cutting Machines

Optimising Silicone Extrusion Cutting with Gillard Cutting Machines 

Jehbco Silicones, a leading manufacturer in the silicone extrusion industry, has always prioritised precision and efficiency in its production processes. In pursuit of these goals, the company has integrated three cutting-edge Servo-Torq® Standard rotary cutting systems from Gillard Cutting Technology into its operations. The ST-MT/50C models in use at Jehbco are engineered to handle the rigorous demands of cutting silicone extrusions, such as tubing, with unparalleled accuracy and speed. 

Superior Cutting Capabilities 

The primary advantage of the Servo-Torq® ST-MT/50C models lies in their ability to deliver high-speed cutting without compromising on precision. These machines are capable of making up to 2000 cuts per minute, a feat that significantly enhances production efficiency. Whether dealing with small or large batches, Jehbco can now ensure that cutting processes keep pace with the extrusion lines, eliminating bottlenecks and improving overall throughput. 

Moreover, the ST-MT/50C models are designed to handle a variety of extrusion sizes. With the capacity to cut extrusions with outer diameters (OD) of up to 50 mm, these machines offer versatility that is critical for Jehbco’s diverse range of products. The ability to manage both thin-walled tubing and solid cords with equal ease makes these machines indispensable in a high-mix production environment. 

Figure 1. Servo-Torq® Standard rotary cutter system (Model ST-MT/50C) with Accra-Feed™ UA75 caterpillar infeeder/puller.

Figure 1. Servo-Torq® Standard rotary cutter system (Model ST-MT/50C) with Accra-Feed™ UA75 caterpillar infeeder/puller.

Precision and Control 

Precision is another hallmark of the Servo-Torq® rotary cutting systems. The machines are equipped with a high-speed “flying knife” blade driven by a 5.5 kW brushless AC servo motor, which ensures clean, accurate cuts every time. The digital servo drive system, featuring Lenze i700 multi-axis control, offers precise torque and speed regulation, further enhancing cutting accuracy. This level of control is essential for maintaining the stringent quality standards that Jehbco’s clients expect. 

The inclusion of the Accra-Feed™ UA75 caterpillar infeeder/puller system further refines the cutting process. This component uses twin 2.3 Nm AC brushless servo motors to maintain consistent line speeds, which is crucial for ensuring that cut lengths remain uniform. The system’s ability to hold speed within ±0.1% of the maximum line speed is particularly beneficial when producing long, continuous runs of extrusions. 

Figure 2. One of three Gillard cutting machines in use at Jehbco Silicones.

Figure 2. One of three Gillard cutting machines in use at Jehbco Silicones.

User-Friendly Operation and Safety 

Despite their advanced capabilities, the Servo-Torq® ST-MT/50C machines are designed with user convenience in mind. The Siemens TP700 Comfort touch-screen control panel offers an intuitive interface, allowing operators to easily set cut lengths, batch quantities, and caterpillar belt speeds. This interface supports Jehbco’s goal of minimising downtime by enabling quick adjustments and real-time monitoring of the cutting process. 

Safety is another critical aspect of these machines. The Servo-Torq® ST-MT/50C models are equipped with full safety guarding and meet all relevant EN standards, ensuring a safe working environment for operators. The machines also come with an emergency stop button, cutter and caterpillar-on indicator lamps, and a power-on indicator lamp, providing clear and immediate feedback on the machine’s status. 

Conclusion 

The integration of the Servo-Torq® ST-MT/50C cutting machines at Jehbco Silicones represents a significant enhancement to their production capabilities. With the ability to perform up to 2000 cuts per minute and handle extrusions with ODs of up to 50 mm, these machines ensure that Jehbco can meet its customers’ demands for precision, quality, and efficiency. As a result, Jehbco is well-positioned to maintain its leadership in the silicone extrusion industry, delivering high-quality products that meet the most stringent standards. 

 

References 

  1. https://www.gillardcutting.com/applications/rubber-extrusion 
  2. https://www.gillardcutting.com/downloads/datasheets/Servo-Torq_LT__MT_Combi_DD_datasheet.pdf 

 

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AS4020 Compliance in Silicone Tubes

AS4020 Compliance in Silicone Tubes 

AS/NZS (Australia/New Zealand Standard) 4020 outlines tests for evaluating the suitability of products for use in contact with drinking water, focusing on their effect on the quality of the water. AS4020 tests are conducted on both hot and cold-water drinking applications. The testing focuses on wetted parts only. This test is usually done on pipes, tubes, taps and all other components that comes in contact with the drinking water. Jehbco offers tubes that are AS4020 complaint. Jehbco serves a diverse range of customers who use our silicone tubes for drinking water applications. Jehbco works with required customers to get the products certified to AS4020 test results are typically valid for five years, after which a retest is required to maintain compliance with the standard. 

AS 4020 test ensures that the silicone materials used in the drinking water applications do not adversely affect the water quality and are safe for human consumption. The test gives assurance to the customer that drinking water passing through our silicone tubes is non-toxic and free from contaminants. This test is typically conducted during the initial stages of a new order. The customer selects the required material, Jehbco manufactures the test pieces, and they are sent to NATA-accredited labs for testing. Once the product passes the test, the AS4020-compliant material is used for bulk production of the customer’s order. Jehbco ensures that the test piece is manufactured as per customers original requirement (color, catalyst, curing etc) to ensure all the products used in the manufacture of the tube is compliant to AS4020. 

A variety of tests are conducted in AS4020 certification to ensure the suitability of material used in drinking water applications. The main aspects being tested are Leachability tests, Microbiological safety, Physical and mechanical properties, taste and odor tests, PH and water quality impact as well as the regulatory compliance. The main tests conducted for the different aspects of the standard is given below. 

Taste: A trained panel tastes and evaluates the water extracts to identify whether the product releases compounds that have a detectable taste. 

Appearance: Water that has come into contact with a product is analyzed for any changes in color or turbidity. Appearance is also tested upon coming on contact with organic compounds. 

Growth of aquatic micro-organisms: Products are examined for their capacity to support bacterial growth by monitoring dissolved oxygen levels. This test usually takes 8 weeks to complete 

Cytotoxic activity: Water extracts are examined for cytotoxicity by utilizing mammalian cell lines cultured in the laboratory. Any negative impact on cell health is concluded as a cytotoxic effect. 

Mutagenic activity: An in vitro genetic toxicology test (AMES) designed to detect mutagenicity of chemicals by various mechanisms. The AMES tests help to assess whether products release mutagenic compounds. Water extracts are combined with specific bacteria, and any observed changes in the bacteria’s genetic makeup are concluded as the evidence of mutagenic activity. 

Metals: Water extracts are tested for the presence of metals like aluminum, arsenic, antimony, barium, boron, cadmium, chromium, copper, iron, lead, manganese, mercury, molybdenum, nickel, selenium, and silver. The limits comply with the Australian Drinking Water Guidelines (ADWG). The extraction can be done using either an end-of-line test or an in-line test. 

High Temperature Tests: High temperature tests are conducted on parts that comes in to contact with high temperature. 

Some of the key benefits of AS 4020 compliances for silicone tubing include enhanced consumer confidence, improved market access, and reduced liability. At Jehbco, we offer a wide range of FDA-approved silicone products. One of our standout offerings is the 70 Duro platinum silicone, which is specifically designed for food and drink applications and complies with AS 4020. For silicone tubing, compliance with this standard not only enhances consumer trust but also opens doors to wider market opportunities. As industries continue to prioritize safety and quality, adhering to AS 4020 is extremely important to Jehbco.  

References 

  1. https://www.eurofins.com.au/biopharma-services/plumbing-products/asnzs-4020-for-watermark/#:~:text=AS%2FNZS%204020%20prescribes%20tests,application%20for%20WaterMark%E2%84%A2%20certification. 
  2. https://www.awqc.com.au/__data/assets/pdf_file/0010/579367/AWQC-Product-testing-to-ASNZS-4020-fact-sheet.pdf 
  3. https://www.scribd.com/document/436345643/As-4020-Testing-of-Products-for-Use-in-Contact-With-Drinking-Water 
  4. https://www.sandiego.gov/public-utilities/water-quality/water-quality-in-your-home-or-business 

 

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Fabricating Extrusion Dies and Tooling using Wire EDM Technology

For nearly 50 years, Jehbco Silicones has been at the forefront of silicone extrusion, amassing an impressive library of over 2,600 extrusion dies and a wealth of knowledge to ensure the delivery of perfect silicone products to their customers. One of the critical elements contributing to our sustained excellence and innovative edge is the use of advanced machining technologies for tool and extrusion die making at Jehbco, such as our Excetek V400G Wire Electrical Discharge Machine (Wire EDM). 

Figure 1. Excetek V400G Wire EDM Machine used for cutting extrusion dies and tooling at Jehbco.

What is Wire EDM? 

Wire EDM is a non-conventional machining process that uses a thin wire as an electrode to cut intricate shapes and fine details in hard materials. The Excetek V400G model employed by Jehbco Silicones stands out due to its precision, reliability, and ability to produce complex geometries with exceptional accuracy. The WEDM process works by generating a series of electrical discharges (sparks) between the wire and the workpiece. These sparks erode the material, creating the desired shape. The wire, typically made of brass or a similar conductive material, does not make physical contact with the workpiece, which allows for precise cutting without the wear and tear associated with traditional machining tools. This technology operates in a submerged environment, which helps to control the temperature and remove debris, further enhancing the precision of the cuts [1][2]. 

Figure 2. Diagram of wire EDM cutting process [3].

Advantages of Wire EDM Over Traditional Machining Methods 

Unparalleled Accuracy: Wire EDM machines, like the Excetek V400G, achieve a level of precision that is difficult to match with traditional machining methods. The accuracy of the Wire EDM process can reach tolerances within microns, making it ideal for producing intricate extrusion dies required in silicone product manufacturing. This precision ensures that the final product adheres to exact specifications, reducing waste and enhancing product quality​ [1][2]. 

Ability to Machine Intricate Geometries: Traditional machining methods often struggle with creating complex shapes and fine details, especially in hard materials. Wire EDM excels in this regard, as it can effortlessly cut intricate geometries, including sharp corners, thin walls, and delicate features. This capability is particularly beneficial for Jehbco Silicones, where the design of extrusion dies often demands intricate patterns to meet specific customer requirements​ [1][4]. 

Figure 3. Extrusion dies with intricate profiles cut using wire EDM.

Material Versatility: Wire EDM machines can cut a wide range of conductive materials, from common metals like steel and aluminium to exotic alloys and hardened tool steels. This versatility allows Jehbco to fabricate extrusion dies and tools from materials best suited to the specific demands of silicone extrusion [2][6]. 

Enhanced Surface Finish: The Wire EDM process produces a high-quality surface finish, often eliminating the need for additional finishing operations. This is crucial for extrusion dies, where a smooth surface ensures consistent flow through the extrusion die and reduces the likelihood of defects such as streaks in the final silicone product [2][6]. 

Automation and Efficiency: Modern Wire EDM machines like the Excetek V400G are equipped with advanced automation features, including CNC controls and automatic wire threading. These features enhance operational efficiency, reduce setup times, and allow for unattended machining. For Jehbco Silicones, this means faster production cycles and the ability to meet tight deadlines without compromising quality​ [2][5]. 

Jehbco’s Expertise and Experience 

With five decades of experience in silicone extrusion, and a library of over 2600 dies and extrusions at Jehbco, there is a wealth of knowledge and data to draw from. This experience and expertise, combined with the precision of our Excetek wire EDM machine, enables Jehbco to fabricate high quality extrusion dies with which to produce the perfect silicone products tailored specifically for our customers. The integration of Wire EDM technology has allowed Jehbco to push the boundaries of what is possible in silicone extrusion, offering innovative solutions and products that set industry standards. 

Overall, the adoption of the Excetek V400G Wire EDM machine at Jehbco Silicones underscores the company’s commitment to precision, innovation, and quality. By leveraging the advantages of Wire EDM, Jehbco continues to lead in the silicone extrusion industry, delivering products that consistently exceed customer expectations. The combination of advanced technology and extensive experience positions Jehbco as a trusted partner for those seeking high-quality silicone extrusion solutions. 

References 

  1. Wire EDM: Guide to EDM Wirecut Machine, Process & Uses – Fine Metalworking.
    https://finemetalworking.com/wire-edm 
  2. Wire EDM: Components, Types, Applications, and Advantages – IQS Directory.
    https://www.iqsdirectory.com/articles/edm/wire-edm.html 
  3. Wire EDM – Manufacturing Guide Sweden
    https://www.manufacturingguide.com/en/wire-edm 
  4. What’s Wire EDM Machining? Techniques, Benefits, and Uses – Rapid Direct.
    https://www.rapiddirect.com/blog/what-is-wire-edm/ 
  5. Wire EDM Explained: Everything You Need to Know – Union Fab.
    https://www.unionfab.com/blog/2023/10/wire-edm 
  6. All About Wire EDM Machining: Definition, Application, and Materials – Xometry.
    https://www.xometry.com/resources/machining/wire-edm-machining/ 

 

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Low Compression Set in Silicone Rubber and its Application in Seals

Silicone rubber is well known for its excellent elastomeric properties, exhibiting outstanding elongation at break values and rebound resilience. Due to these properties, silicone is an ideal material for producing a wide variety of seals and gaskets which readily form stable and durable mechanical seals upon applying pressure.  

A crucial parameter in the sealing performance of silicone is the compression set. In a sealing application, mechanical force is applied on the silicone seal to compress it between two surfaces. The elastomeric properties of the silicone causes it to bounce back to its original shape, and tightly forms a seal against the two surfaces that obstructs any flow of liquids and gasses. However, upon long-term compression, the silicone can lose a fraction of its shape memory, becoming permanently deformed and will no longer fully bounce back to its original shape. This permanent deformation after prolonged mechanical stress is applied and then released is known as the compression set. If a material has a high (poor) compression set, a large proportion of its original shape memory will be lost upon prolonged compression, which can cause sealing failure. Thus, compression set is a crucial property in sealing design as it indicates the ability of the seal to maintain its shape and sealing properties over extended periods of time. 

Compression set of silicone elastomers is typically measured using conventional standards such as ISO 815-1 B and ASTM D395 B. In these standards, standardised samples of silicone are placed between two metal plates which are then compressed, using gauge blocks to calibrate a fixed deformation distance, which is typically 75% of its original height. The entire apparatus is then placed in elevated temperatures to promote accelerated ageing, and compression set is provided at the testing values. For silicone rubber, a compression set testing period of 22 h at 175°C is often used. For related materials such as silicone sponge, separate testing samples and test durations are outlined in ASTM D1056.  

Solid silicone rubber exhibits excellent compression set values, typically between 10 – 30 % depending on the hardness and grade used, which is significantly lower than other elastomers such as EPDM or neoprene. In addition to an excellent low compression set, silicone is a chemically inert material, has outstanding heat resistance, and is safe for use in contact with food, and is thus the material of choice for sealing applications in high temperature environments, and food and medical grade industries. More information on silicone seals, mechanical properties and elastomeric behaviour is available on our articles page.  

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Post Curing of Silicone Tubing

Post Curing is the process of heating up the silicone tubing in an oven at a given temperature for certain amount of time.  The lowest and highest temperatures used in Jehbco for post curing is 160˚C and 200˚C. Post curing process helps to remove the volatiles from the manufactured products. 

As the name indicates, post curing is the secondary curing process in the silicone manufacturing. The Post curing helps to further cross link the polymer chains to enhance mechanical properties, thermal and chemical resistance. Post curing of silicone helps to improve the physical characteristics of the material. All silicone elastomers go through a peroxide silicone curing using peroxide-based chemicals or a platinum cure using a catalyst.  Even though the rubber is in a finished product format, it is still not a stable state. Few by products /volatiles from the chemical process is left with the silicone after the initial cure. These volatiles will be removed during the post curing process. Inadequate or poor post-cure may cause bubbling, delamination and unappealing sticky surface deposits. 

In a typical post curing process, the temperature is adjusted between 160˚C and 200˚C for a period of 2-6 hours. The time and temperature may be altered depending on the application. Post-curing ensures the product remains dimensionally stable. Post Curing also helps to reduce /eliminate the outgassing process. The main reduction in mechanical properties of the silicone occurs in the first couple of hours at a service temperature. Post-curing brings the silicone to a state where its degradation rate is minimized, ensuring long-lasting performance with consistent quality. 

Apart from all the advantages mentioned above, post curing also helps to enhance the thermal stability of silicone rubber. Allowing it to maintain its properties at higher temperatures without degrading. For silicone products that come into contact with high-temperature surfaces, undergoing the post-curing process is highly beneficial as it posts curing will produce a highly thermal resistant product.  

By completing the cross-linking process, post-curing improves the silicone’s resistance to chemicals and solvents. This is particularly important in environments where the material is exposed to aggressive substances, such as in pharmaceutical or food processing equipment. Current manufacturers recommendation from Jehbco’s supplier is to post cure at 200 degrees Celsius for 4 hours for pharmaceutical and food applications.

Oven temeprature records which shows the temeprature distribution in different locations of the oven

Jehbco is dedicated to meeting customer silicone requirements despite the costliness of post curing. The company employs oven curing or all post curing needs, a process involving placing manufactured goods in an oven under carefully controlled temperature and time conditions. Jehbco utilizes two new ovens from Steridium for this purpose, ensuring efficient post curing operations. One oven is exclusively used for platinum curing, while the other is dedicated to peroxide curing. This segregation guarantees that there is no cross contamination during the post curing stage at Jehbco.  The Airflow specification for Jehbco’s new ovens is 20,000 liters/minute. Thermocouples are positioned in nine locations on both sides of the oven to monitor and ensure even heat distribution throughout. The oven requires only 30 minutes to reach the desired temperature. Customers may request post curing of silicone from Jehbco if needed. Jehbco will monitor the temperature readings from the ovens to ensure the post curing process is executed effectively. Committed to delivering top-quality products, Jehbco prioritizes maintaining customer trust and satisfaction. The oven picture and the sample temperature records are added in the annex section of the article. 

References 

  1. https://rdabbott.com/wp-content/uploads/2017/08/Dow-Corning-Post-Curing-Silicone-Elastomers.pdf 
  2. https://shorehoses.com/news/importance-of-post-curing-of-silicone-products/ 
  3. https://www.adhesivesmag.com/articles/99586-post-cure-advantages-for-silicone-elastomers-and-adhesives 
  4. https://www.wacker.com/h/medias/7562-E-0323-final.pdf 
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Silicone products for pharmaceutical industry

Silicone products for pharmaceutical industry

Silicone tubing is widely used in pharmaceutical and biomedical industries. This article will detail the specific reasons why silicone tubing is preferred in numerous pharmaceutical applications.

Silicone tubing’s are well known for its flexibility, durability, and chemical inertness which makes it ideal to be used for pharmaceutical applications. Silicone is one among the very few biocompatible materials available in the industry. Silicone is also odourless, tasteless and heat resistant.

Biocompatibility

Silicone rubber is known for its biocompatible nature. Silicones are biocompatible because they do not support microbiological growth and they do not interact with microbiomes. Silicone materials is formed by a highly strong and stable chemical bond and so the binding energy between siloxane bonds are stronger than that of carbon bonds. The stronger binding energy in silicone polymer makes it durable, chemically and thermally stable. Due to the strong binding energy, silicone bonds can’t be broken and thus it is insoluble in body fluids and chemicals. The chemically inert nature of silicone is crucial for the pharmaceutical industry, where product purity is paramount.  The intermolecular force between silicone bonds is low, which makes gives it high elasticity and compressibility.

Thermal & chemical stability

Due to the high binding energy of siloxane bonds, these bonds cannot be broken even at 200 degrees Celsius. Properly cured silicone rubber is also stable This strong binding energy also contributes to the chemical stability of silicone products, as chemicals are unable to react with them since the siloxane bonds remain intact. The capability to resist a wide range of temperatures, from extreme cold to intense heat, without degradation, is vital for sustaining the integrity of sensitive pharmaceutical products. The thermal, chemical and electrical insulation properties of silicone make it ideal to be used in pharmaceutical manufacturing and research laboratories.

Non – Porous Sterile nature

Along with biocompatibility, silicone rubber is also non-porous, making it impermeable to water and easier to clean this will also eliminate the chances of bacteria growing up in the products. Silicone materials are easy to be cleaned/sterilized as it is heat, cold and chemical resistant. Various heat sterilization options are widely used for cleaning silicone products as they are heat resistant.

Flexibility

The improved flexibility of silicone products makes it ideal for various fluid transfer applications in pharmaceutical industry. Furthermore, the translucency of silicone tubes helps in monitoring of fluid flow, which is vital in various pharmaceutical applications.

Durability

The lifecycle of a silicone product may vary based on the way it is cured and the environment it is being used. Based on the curing process, there are products that can last up to 40-45 years. The durability is crucial in pharmaceutical applications as they are primarily focused on human lives.

Why Choose Jehbco?

Platinum-cured hospital-grade silicone manufactured by Jehbco is biocompatible and non-porous. With proper curing and post-curing, Jehbco’s platinum hospital-grade silicone can be used for food contact applications and complies with the Recommendation “XV. Silicones” of the BfR and FDA 21 CFR §177.2600 “Rubber Articles Intended for Repeated Use,” considering any given limitations on extractable and volatile substances. The raw material used by Jehbco for hospital-grade tubing also come with a statement from the supplier regarding biocompatibility, in accordance with USP<88> Class VI and selected tests of ISO 10993.

Some common applications in pharmaceutical industry

Peristaltic Pumps: Contamination free fluid transport

Laboratory Research: For the management sensitive biological samples, where cleanliness and non-toxicity are crucial.

Sterile Filling: Essential in the aseptic filling of pharmaceutical products.

Drug Delivery Systems: Precise and contamination free drug delivery.

 

References 

  1. https://fluidbiosolutions.com.au/the-ultimate-guide-to-silicone-tubing-in-pharmaceutical-applications/#:~:text=Silicone%20tubing%20is%20extensively%20used,precision%20and%20purity%20are%20critical.
  2. https://globalsilicones.org/explore-silicones/benefits-uses/healthcare/#:~:text=Their%20chemical%20stability%2C%20durability%2C%20and,tension%2C%20and%20ease%20of%20sterilization.
  3. https://www.vikingextrusions.co.uk/blog/how-silicone-is-used-in-medical-pharma/https://www.sciencedirect.com/topics/engineering/silicone-material#:~:text=Silicone%20materials%20consist%20of%20repeating,and%20insoluble%20in%20body%20fluids.
  4. https://www.shinetsusilicone-global.com/catalog/pdf/rubber_e.pdfhttps://www.xometry.com/resources/materials/properties-of-silicone/
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Optical Comparator Technology at Jehbco Silicones: Revolutionising Dimensional Accuracy

Optical Comparator Technology at Jehbco Silicones: Revolutionising Dimensional Accuracy

At Jehbco Silicones, precision and accuracy in product dimensions are paramount. To achieve this, the company employs an advanced optical comparator, the Starrett Precision Optical VB400 model. This tool represents a significant advancement over traditional measuring methods such as the Vernier caliper, especially in handling the delicate and intricate profiles of silicone extrusions.

What is an Optical Comparator?

An optical comparator is a device used in manufacturing and laboratory settings to magnify the silhouette of a part onto a screen to compare it against a set scale or the design drawing. It combines optics, mechanics, and electronics to offer non-contact measurement, which is crucial for materials that are easily deformed or damaged. The Starrett VB400 at Jehbco Silicones utilizes high-quality optics to project a shadow of the silicone profile onto a screen at precise magnifications, allowing for meticulous inspection and measurement.

Starett VB400 optical comparator used at Jehbco

Figure 1. Starett VB400 optical comparator used at Jehbco

How It Works 

The process begins by placing a silicone extrusion profile on the stage of the optical comparator. Light is projected onto the object, casting a shadow which is magnified and projected onto a screen. This shadow clearly displays the profile’s dimensions and geometry against predefined scales or overlays. Engineers at Jehbco can then visually compare and measure each dimension against the profile drawings or utilize digital tools integrated into the VB400 model to capture and analyse these measurements automatically.[1] [2]  

Measurement Capabilities 

The Starrett VB400 optical comparator boasts a high degree of accuracy, thanks to its advanced features. It is equipped with linear encoder scales that offer a resolution of 0.1 microns (0.000004 inches), which ensures precise measurements. Furthermore, the VB400 is particularly adept at handling complex profiles and dimensions that are difficult to measure with traditional tools. This high resolution facilitates the examination of complex and detailed part geometries, making the VB400 a robust tool for quality assurance at Jehbco where precision is critical​. It can accurately define radius, diameter, clearances, and angular dimensions, which are often critical in the high-quality silicone products manufactured by Jehbco. This precision is facilitated by features such as high-resolution cameras and digital displays, enhancing the ease and accuracy of the measurement process.[3] [4]  

 A silicone extrusion sample is placed on a glass platform above a light source, projecting a silhouette for accurate, non-contact measurement.

Figure 2. A silicone extrusion sample is placed on a glass platform above a light source, projecting a silhouette for accurate, non-contact measurement.

Advantages Over Traditional Methods of Measurement 

Optical comparators offer several advantages over traditional measuring tools like Vernier callipers. Firstly, they provide a non-contact measurement method, thereby preventing any deformation during measurement. This is particularly advantageous for soft materials like silicone which deform under physical contact. Using an optical comparator ensures that the integrity of the part remains intact during inspection. Additionally, the magnification ability of the optical comparator allows for the detection of minute defects and ensures compliance with tight tolerances that might be missed by the naked eye. 

 Measuring an extrusion sample using Vernier calllipers. Inaccurate measurement due to deformation of the soft silicone rubber.

Figure 3. Measuring an extrusion sample using Vernier calllipers. Inaccurate measurement due to deformation of the soft silicone rubber.

Moreover, with features like digital readouts and automated data collection, the VB400 speeds up the measurement process and reduces the potential for human error, enhancing the overall efficiency of quality control at Jehbco. [1] [3 

Conclusion 

The investment and use of the Starrett Precision Optical VB400 at Jehbco Silicones highlights the company’s commitment to quality and precision in the manufacture of silicone extrusion profiles. By adopting such advanced metrology tools, Jehbco ensures that each product not only meets but exceeds customer expectations and industry standards, reaffirming our position as a leader in the silicone manufacturing industry. 

References 

  1. Higher Precision Blog: How an Optical Comparator Works
    https://www.higherprecision.com/blog/what-is-an-optical-comparator 
  2. VisionX Inc: What Is an Optical Comparator and How Does It Work?
    https://www.visionxinc.com/what-is-an-optical-comparator 
  3. Starrett Metrology: Starrett Optical Comparators
    https://au.starrett.com/product-detail/VB400 
  4. Crescent Gage & Tool: Starrett VB400
    https://crescentgage.com/gaging-equipment-sales/starrett/vertical/starrett-vb400/ 
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Unveiling the Elasticity Dynamics: A Deep Dive into Silicone Rubber’s Rebound Resilience

When any elastic material is exposed to an impact load, it will initially deform before bouncing back to its original shape. When this occurs, part of the initial energy delivered by the impact is returned as mechanical energy, and a certain portion is dissipated as heat. From this, the rebound resilience is defined as the ratio of mechanical energy returned to the initial mechanical energy exerted from the impact. Higher rebound resilience indicates stronger elasticity, resistance to deformation and a stronger capacity to bear impact loads. However, for some applications such as vibration dampening, lower rebound resilience may be more beneficial.

Testing for this property is typically performed by dropping a standardized pendulum at a set height and speed onto a material sample, as described by standards including ISO 4662 and DIN 53512. After the pendulum impacts the rubber, the rubber will deform before pushing back against the pendulum, returning mechanical energy. Here, the rebound resilience can be quantified by the ratio of the pendulum rebound height to the initial release height.

Compared to other elastomers silicone rubber exhibits intermediate rebound resilience values, typically between 30 and 70 %. Typically this is better than some elastomer families such as butyl or styrene-butadiene rubber, but worse than elastomers such as natural rubber or polyurethane. Notably, silicone rubber can be produced to have high rebound resilience in a range of hardness values. Thus, depending on the application, silicone rubber can be an excellent choice for dampening applications or dynamic applications where higher rebound resilience is more important.

While rebound resilience is one method of quantifying material elasticity, another complementary parameter that characterizes a material elasticity is the material’s compression set. This property describes how readily the shape of a material is permanently affected when subject to prolonged deformation. More information on silicone’s outstanding compression set is available on our articles page.

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Carbon-based vs Silver-based Electrically Conductive

Carbon-based vs Silver-based Electrically Conductive Silicone

Standard silicone elastomers are electrically insulating, however with the right chemistry and speciality materials they can be made electrically conductive. 

The most common ways of making electrically conductive silicone is by combining it with reinforcing filler materials with strong electrical conductivity. These can include silver coated glass/graphite/nickel/copper/etc, pure silver nanoparticles, or more commonly conductive carbon black. Silver based conductive filler provides extremely low electrical resistivity profiles up to 0.002 Ohm/cm and provides electromagnetic pulse (EMP) shielding properties for highly specialized applications. However, these silver-based conductive silicone components cannot be produced via extrusion and cannot be directly produced at Jehbco. 

 

Conductive Component Pros Cons
Silver or Metal Based Nanoparticles
  • Excellent EMP shielding capabilities
  • Extremely high electrical conductivity (resistance ~ 0.002 Ohm/cm)
  • Excellent temperature stability (-50 to 200 °C)
  • Extremely expensive
  • Poor mechanical strength 
  • Cannot be produced via extrusion
  • High density (~ 3 g/cm3)
Conductive Carbon Black
  • High electrical conductivity (resistance ~ 2 Ohm/cm)
  • Good mechanical properties
  • Producible via extrusion
  • Low cost compared to other conductive grades
  • Excellent temperature stability (-50 to 200 °C)
  • Standard silicone density
  • Intrinsically flame retardant
  • Weaker EMP shielding capabilities
  • Conductivity still high, but not as good as silicone with silver based conductive components

 

For extrusion silicone materials, conductive carbon black is commonly used to create highly conductive silicone materials. Conductive carbon black is a speciality grade of carbon that is manufactured entirely differently from carbon blacks used in pigmentation, which provides it with extremely useful properties including high electrical conductivity. Interestingly, the use of carbon black necessitates the use of more resourceful chemistry to facilitate processing. High loadings of carbon black typically interfere with standard peroxide silicone curing systems, due to incompatibility with the most common catalyst used in extrusion processing (2,4 dichlorobenzoyl peroxide). Thus, platinum curing systems must be used in all carbon loaded electrically conductive silicone articles processed via extrusion. 

 

By utilizing elevated quantities of reinforcing and electrically conductive carbon black, extremely low electrical resistivity of < 2 Ohm/cm are commonly achieved, while maintaining excellent mechanical integrity. In addition to providing electrical conductivity, the addition of conductive carbon black provides increased fire retardant properties without requiring supplementary fire retardant additives. Carbon black conductive silicone components find frequent application in sensors and electrical components, and can also be used as anti-static materials including sleeving to discharge static build-up.

 

At Jehbco, we offer electrically conductive silicone in from 50 to 70 ShA hardness exhibiting extremely low electrical resistance (<2 Ohm/cm), and can be formulated to other hardness grades based on customer requirements. All Jehbsil conductive silicone is jet black in colour. For another article comparing conductive silicone to standard silicone, see: https://jehbco.com.au/silicone-electircally-conductive-silicone/

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