O-ring Elastomers
Elastomers are split into types or fami-lies based on the basic polymer from which they are made. The following table contains the nomenclature used for the different elastomer types per ASTM & ISO
Within each elastomer type, the individual elastomers vary in the fillers, softeners (plasticizers), processing aids,curing agents, accelerators and other additives that they contain. The properties of the base polymer, the
types and quantities of the additives and how the elastomer is processed are what determine the chemical and physical properties that may make a particular elastomer right or wrong for an application.
The purpose of the standard is to offer guidance on the types of materials available, to indicate what level of performance can be expected from the materials, and to offer a means of providing a “line call-out” designation for materials.
The materials are identified initially by type, which is an indication of heat resistance, and by class,which is based on oil resistance.The temperature resistance and the oil resistance are indicated with letter designations as shown to below..
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