ASTM C 639:2024

1.1 This test method describes a laboratory procedure for the determination of rheological (flow) properties of single- and multi-component chemically curing sealants for use in building construction. 1.2 Other suitable flow characteristics may be agreed upon between the seller and purchaser or specifier. Special non-sag properties and lower flow characteristics may be required for use in sloping joints where absolute leveling is not desired. Note 1: The sealants are supplied in various rheological properties ranging from pourable fluids to stiff non-sagging pastes. Multi-component sealants are supplied as a base component with an activator or curing agent separately packaged. After mixing the multiple parts, the sealant is ready for application. Single-component sealants are supplied ready for use upon opening of the package and usually depend on the external environment for cure. 1.3 This test method describes four types of joint sealants: 1.3.1 Type I- Single-component flowable or self-leveling, 1.3.2 Type II- Single-component non-sag, 1.3.3 Type III- Multi-component flowable or self-leveling, and 1.3.4 Type IV- Multi-component non-sag. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

91.100.50