The SAE Committee on Automotive Rubber Specifications has concluded, that in light of the fact that SAE J18 is a mirror image of ASTM D 1056 (Vol. 8.01), SAE J18 will be eliminated in the year 2005.
This SAE Recommended Practice covers flexible cellular rubber products known as sponge rubber and expanded rubber, but does not apply to latex foam rubber or ebonite cellular rubber. The base material for an open/closed cellular product may be made of synthetic, natural, reclaimed rubber, or a mixture, and may contain other polymers or chemicals, or both, which may be modified by organic or inorganic additives. These elastomeric materials have properties similar to those of vulcanized rubber, namely (a) the ability to be converted from a thermoplastic to a thermosetting state by crosslinking (vulcanization) and or (b) substantial recovery of their original shapes when strained or elongated, or both.
Extruded or molded shapes of sizes too small for cutting standard test specimens are difficult to classify or test by these methods and will usually require special testing procedures.
In case of conflict between the provisions of this general specification and those of detailed specifications or test methods for a particular product, the latter shall take precedence. Reference to the test methods in this document should specifically state the particular test or tests desired.
The values stated in SI units are to be regarded as the standard. English units are included for reference only.
The following safety hazards caveat pertains only to the test methods portions of this document: This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this document to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
NOTE -- ASTM D 1056-98 and ISO 6916-1 are similar to this document.
Rationale
The SAE Committee on Automotive Rubber Specifications has concluded, that in light of the fact
that SAE J18 is a mirror image of ASTM D 1056 (Vol. 8.01), SAE J18 will be eliminated in the year 2005.
The Committee on Automotive Rubber Specifications (C.A.R.S.) develops and maintains SAE Standards, Recommended Practices and Information Reports relating to the development of thermoset and thermoplastic elastomer specifications for use in automotive and related industries. The J200 HK Table Task Force is updating the classification and characterization of fluorocarbon elastomers (FKM), which will make the table more useful to users of this family of elastomers. The Engine Oil Comp. with Rubber Gaskets and Seals is working on standard reference elastomers to be used in evaluation of current and future engine oils. These standards can be used for comparative studies, to determine the possible deleterious effects of oil technology changes on elastomers used in automotive and related applications. Participants in the SAE Committee on Automotive Rubber Specifications include OEMs, suppliers, consulting firms, government and other interested parties.
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Sponge and Expanded Cellular Rubber Products
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