| Materials (O-Rings) | |||||||||||||||||||||||||
 Elastomers that are intended for, but not
limited to, use in automotive applications, are
designated by ASTM D2000 on the basis of type (heat
resistance) and class (oil resistance).Resistance to special fluids or environments (fuels, water, ozone, etc.) are also classified in a similar manner. ASTM D1418 lists different polymers by an abbreviated coding system (NBR, EPDM, ECO, SBR, FKM, etc.). By utilizing this classification system, guidance is provided to the engineer in the selection of practical, commercially available rubber materials, and to also provide a method for specifying these materials by use of a simple "line call-out" designation. |
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| Standard
compounds have been formulated to meet a number of
laboratory and industry standards for a wide range of
applications. Basic characteristics of standard compounds are given in table 1. Table 1: Standard compounds - basic characteristics
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| Physical
characteristics of our standard compounds are listed to
provide assistance in selecting the proper compound. A number of proprietary compounds with unique characteristics and hardnesses are available along with additional information from our Technical Sales and Services Department. |
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| Selection
of elastomers is normally the final result of a
compromise between fluid resistance and last, but not
least, the cost of the product. Chemical resistance of different elastomers are listed in standard compounds - chemical resistance. |
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| Tear resistance of elastomer (ASTM D624-B) is very important for those applications where rubber parts are subject to strain and stresses, particularly when surface cuts could cause tears and severely damage the effectiveness of the seal.Wear resistance (ASTM D394) is very important for the correct evaluation of any O-Ring in a dynamic sealing application.Critical factors to be considered are: polymer type, hardness, surface finish, lubrication, relative speed and environment. | |||||||||||||||||||||||||
| Elastomers
have a large use in electric and electronic fields due to
their dielectric characteristics and versatility. Typically, the attention of the project engineer is focused on the electric insulation obtainable with rubber. On request, rubber can also be supplied as an electric conductor or anti static, by means of special additives to the compound. The most common standards regarding electric characteristics are ASTM D257 and ASTM D991 (volume and surface resistivity), ASTM D149 (dielectric rigidity) and IEC Standards (International Electric Commission). |
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| The factories Compounding Division has the ability to meet the special compounding requirements for a vast number of industries, offering materials previously tested at a variety of temperature and media environments. The factory can also custom formulate compounds with specific characteristics, thus giving an invaluable service to our customers. The techincal data and characteristics of some of those special compounds are listed in a separate brochure. | |||||||||||||||||||||||||
A number
of government and independent regulatory agencies
maintain standards dealing with elastomers and the
environments in which seals are expected to perform.
Listed are the agencies deeply involved in O-Ring
approvals:
These Organizations operate laboratories for examination and testing to certify compounds and finished parts such as O-Rings. The factory has a number of compounds certified by these Authorities. |
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