ASTM C771-14 (R2019) PDF Download

The ASTM C771-14 (R2019) standard is a laboratory procedure used to determine the weight loss of preformed tape sealants after heat aging. Preformed tape sealants are tacky, deformable solids that are used for sealing applications under compression between two substrates. These sealing tapes are designed to be essentially 100% solid materials and are expected to have minimal weight loss or volatility during long-term use.

The standard specifies a controlled exposure of the preformed tape sealant to an elevated temperature and measures the weight loss of the sealant after this exposure. The purpose is to assess the stability and durability of the sealant under heat aging conditions.

The standard is applicable for preformed tape sealants and not for other types of sealants such as gunnable sealants and caulks. It is important to note that there is a separate ASTM test method, C681, that describes a weight loss or volatility test for knife-grade glazing compounds.

The standard is provided in metric units, and any values given in parentheses are for informational purposes only. The subcommittee responsible for this standard is not aware of any similar ISO standard.