Rubber compounds, such as silicone, can be formulated to have a wide variety of physical characteristics. The ASTM D2000 Standard Classification System for Rubber Products in Automotive Applications, often shortened to ASTM D2000, is a standardised method used to specify the required physical properties of a vulcanised rubber product.
The ASTM D2000 classification takes the form of an alpha-numeric call out, an example of which can be seen below.
ASTM D2000 M5 GE 706 A19 B37 EO16 Z1
The table below contains the different components of the callout using the callout above as an example, along with a brief explanation of each component.
Table 1: Outline of ASTM D2000 Callout Components
|Component||Location in Callout||Explanation|
|Unit of Measure||ASTM D2000 M5 GE 706 A19 B37 EO16 Z1||Indicates the use of metric or imperial units in the callout|
|Grade Number||ASTM D2000 M5 GE 706 A19 B37 EO16 Z1||Indicates the quantity of additional requirements to be tested for the material|
|Type and Class||ASTM D2000 M5 GE 706 A19 B37 EO16 Z1||Indicates the heat resistance (type) and oil resistance (grade) requirements of the material|
|Hardness||ASTM D2000 M5 GE 706 A19 B37 EO16 Z1||Indicates the hardness requirement of the material|
|Tensile Strength||ASTM D2000 M5 GE 706 A19 B37 EO16 Z1||Indicates the minimum tensile strength requirements of the material|
|Suffixes||ASTM D2000 M5 GE 706 A19 B37 EO16 Z1||Indicates any additional requirements of the material, exclusive of the standard requirements above (See Table 2)|
|User Defined Suffixes||ASTM D2000 M5 GE 706 A19 B37 EO16 Z1||Indicates any user-defined additional requirements of the material that are not outlined in the standard suffix naming system.|
Table 2: Naming Convention of Standard Suffixes
|Suffix Letter||Test Required|
Ozone or Weather Resistance
Fluid Resistance (Aqueous)
Fluid Resistance (Fuels)
Low Temperature Resistance
Any special requirement, which shall be specified in detail.
The ASTM D2000 Rubber classification can even be used to differentiate different silicone compounds. For example, the line callout below can be used to describe a hard, high tear strength silicone grade
ASTM D2000 M2 FC 709
Alternatively, the line callout below can be used to describe a soft, high temperature resistant silicone grade.
ASTM D2000 M3 GE 310 A12
The ASTM D2000 rubber classification system is an extremely robust and efficient method of classifying vulcanised rubber materials such as silicone. Jehbco can manufacture compounds to meet most silicone-based ASTM D2000 line callouts.
Please contact our sales team if you would like more information.