If the designation has an M after the year of revision, then this call-out is stated in Metric units, megapascals (MPa). This indicates the minimum tensile strength of the elastomer compound. In this case, it is 610Ħ denotes an elastomer compound with a durometer hardness of 60± 5 A. The specified temperatures at which elastomer compound shall be tested for determining type are shown in table 1.Ĭlass indicates the oil resistance properties of the elastomer compound.Oil resistance measures the maximum amount of volume swell by percentage (Table 2) occurring after 70-h immersion in oil at a specific temperature from Table 1.ĪSTM D 2000 defines durometer hardness and tensile strength with a three-digit number. Type indicates the heat resistance properties of the elastomer compound.With each type, the elastomer compound must meet the following requirements after 70 hours of heat aging at a specified temperature. ozone resistance, low temperature resistance, etc.) and are specified by the Suffix Requirements section of the line callout. If the grade number is other than 1, additional requirements apply (e.g. The Grade Number designates instances where more extensive tests are required.If the grade number is 1, then only the basic requirements of the D2000 specification apply. The absence of an ‘M’ indicates English (imperial) units, in particular tensile strength in psi and temperatures in ☏. The presence of an ‘M’ indicates metric (SI) units, in particular tensile strength in MPa and temperatures in ☌. The year of revision: In this case, the year is 2012. It is much more precise than a generic material designation (e.g. “EPDM”).Ī typical “line callout” for a EPDM rubber may look something like this: hardness, tensile strength, elongation at break, heat resistance, oil resistance etc., that the compound formulation must meet. Basically speaking, it is a way to define the material properties required, in a standardized format, to meet the anticipated service environment and to insure consistent material quality in production. The purpose of this classification system is to provide guidance to the engineer in the selection of practical, commercially available rubber materials, and further to provide a method for specifying these materials by the use of a simple “line call-out” designation.Īn ASTM D2000 “line call-out” does not specify the ingredients of an elastomer compound. It dictates the physical property requirements, e.g. Th e classification system helps to determine properties of vulcanized rubber materials associated with 1) the type identified by heat aging resistance 2) the class identified by resistance to swelling in oils.
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This standard outlines the system used to classify the properties of vulcanized rubber materials, which are, ideally used, for automotive applications.
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