ASTM C864-05 (R2019) PDF Download

ASTM C864-05 (R2019) is a standard specification that covers preformed dense elastomeric compression seal gaskets, setting blocks, and spacers. These materials are used in sealing and glazing applications, particularly in building constructions. The elastomeric materials used should be made from a high-quality ozone-resistant compound that meets the specified requirements. The cured compound should be suitable for use in applications where resistance to sunlight, weathering, oxidation, and permanent deformation under load are important.

The preformed gaskets or shapes should be free of porosity, surface defects, and dimensional irregularities that may affect their performance. The standard specifies various test methods to evaluate the properties of these materials, including hardness, compression set, ozone resistance, tensile strength, elongation, heat aging, tear strength, brittleness temperature, non-staining, and flame propagation tests.

In terms of flame propagation testing, the standard provides two options. Option I requires the flame propagation test, while Option II does not. If no option is specified, Option I automatically applies.

It is important to note that this standard does not assess the fire hazard or risk of materials, products, or assemblies under actual fire conditions. However, the results of the flame propagation test can be used as part of a fire risk assessment that considers other relevant factors. This standard does not have any known comparable standards published by other organizations.