ASTM C473-00

1.1 These test methods cover the physical testing of gypsum board products and gypsum lath.

1.2 The test methods appear in the following order:

Sections Flexural Strength (Method A) 4 to 8 Core, End, and Edge Hardness (Method A) 9 to 17 Nail Pull Resistance (Method A) 18 to 23 Flexural Strength (Method B) 25 to 32 Core, End, and Edge Hardness (Method B) 33 to 40 Nail Pull Resistance (Method B) 41 to 48 Humidified Deflection 49 to 53 End Squareness 54 to 56 Nominal Thickness 57 to 61 Recessed- or Tapered-Edge Depth 62 to 66 Width 67 to 71 Length 72 to 76 Water Resistance of Core-Treated Water-Repellent Gypsum Boards 77 to 81 Surface Water Resistance of Gypsum Boards with Water- Repellent Face Paper 82 to 86

1.3 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information only.

1.4 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.