ASTM C542-05(2017)

1.1 This specification defines the required properties of lock-strip gaskets where resistance to sunlight, weathering, flame, oxidation, permanent deformation under load, and diminution of gripping pressure are prime essentials.

1.2 This specification applies only to the “locking” compression type of gasket, sometimes referred to as the “zipper” type.

1.3 The values stated in SI units are to be regarded as the standard.

1.4 Test Method C1166, as referenced in this specification, should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use.

1.5 The following precautionary caveat pertains only to the test method portion, Section 7, of this specification: 1.6 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.