These test methods cover the physical testing of joint treatment materials such as joint compound, paper joint tape, glass-mesh joint tape, and an assembly of joint compound and paper joint tape. These materials are used in gypsum board construction. The test methods are detailed for the following: joint compound tests—for viscosity, shrinkage, check cracking, and putrefaction; joint tape tests—for tensile strength, width, and thickness; paper joint tape tests—for dimensional stability; assemblages of paper joint tape and joint compound—for bond of paper joint tape to joint compound and cracking of joint compound at tape edges; and glass-mesh joint tape test—for skewness.

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:

Section

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 and health practices and determine the applicability of regulatory limitations prior to use.