ASTM C474 : 15(2020)

Standard Test Methods for Joint Treatment Materials for Gypsum Board Construction

Standard Details

1.1 These test methods cover the physical testing of joint compound, paper joint tape, glass-mesh joint tape, and an assembly of joint compound and paper joint tape.

1.1.1 Joint treatment materials are specified in Specification C475/C475M.

1.1.2 The joint treatment material described in this standard are for use with gypsum board installed in accordance with Specification C840.

1.2 The test methods appear in the following order:

	Joint Compound Tests:
	Viscosity	5
	Shrinkage	6
	Check Cracking	7
	Putrefaction	8
	Joint Tape Tests:
	Tensile Strength	9
	Width	10
	Thickness	11
	Paper Joint Tape Tests:
	Dimensional Stability	12
	Assemblages of Paper Joint Tape and Joint Compound:
	Bond of Paper Joint Tape to Joint Compound	15
	Cracking of Joint Compound at Tape Edges	14
	Glass-Mesh Joint Tape Test:
	Skewness	13

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in brackets are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

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 StandardDetails, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.