for physical properties of elastomeric seals can be very general or extremely
specific in nature. Probably the most common general classification system
is ASTM D 2000 “Standard Classification System for Rubber Products
in Automotive Applications.” The purpose of this classification
system is to aid in the selection of practical rubber products for specific
environments. It also provides a “line call-out” designation
for the specification of materials.
are designated by type (heat resistance) and class (oil resistance). The
heat resistance of an elastomer is based on changes in tensile strength
of not more than ± 30%, elongation of not more than –50%,
and hardness of not more than ±15 points after 70 hours of aging
at the specified temperature. The oil resistance is based on the volume
swell of an elastomer after a 70-hour immersion in ASTM Oil No. 3.
of the general classification positioning of different elastomers is shown
in the chart below.
call-out, or specification, contains appropriate information for testing
and designation for a sealing elastomer. The example shown illustrates
a typical line call-out:
Specifications Part 2, Japanese Industrial Standard (JIS) B 2401 O-rings
We are located in the Denver Technological
Center in a suburb of Denver, Colorado
©1997-2017, Problem Solving Products, Inc.
Website Map | Privacy Statement