3. Summary of Test Methods
3.1 A test specimen is compressed to either a deflection or
by a specified force and maintained under this condition for a
specified time and at a specified temperature.
3.2 The residual deformation of a test specimen is measured
30 min after removal from a suitable compression device in
which the specimen had been subjected for a definite time to
compressive deformation under specified conditions.
3.3 After the measurement of the residual deformation, the
compression set, as specified in the appropriate test method, is
calculated according to Eq 1 and Eq 2.