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Table 1. Physical and Performance Requirements for Glass Mat Gypsum Board
Property	Unit		Requirement
Property	Unit		12.7-mm-thick board	15.9-mm-thick board
Flexural strength bearing edges perpendicular to the substrate edge	N		≥ 445	≥ 623
Flexural strength bearing edges parallel to the substrate edge	N		≥ 356	≥ 445
Humidified deflection	mm		≤ 6	≤ 3
Core, end and edge hardness	N		≥ 67	≥ 67
Nail pull resistance	N		≥ 356	≥ 400
Water resistance	n/a		≤ 10 weight % after 2-h immersion	≤ 10 weight % after 2-h immersion
Thickness		mm	12.7 ± 0.8 nominal thickness with local variations of ± 1.6	15.9 ± 0.8 nominal thickness with local variations of ± 1.6
Width		mm	up to 1 220 ± 3	up to 1 220 ± 3
Length		mm	1 840 ± 6 to 3 660 ± 6	1 840 ± 6 to 3 660 ± 6
End squareness		n/a	Square ± 3 mm in the full width of the substrate	Square ± 3 mm in the full width of the substrate
edges and ends		n/a	Straight and either square, bevelled, featured, tapered, or featured and tapered	Straight and either square, bevelled, featured, tapered, or featured and tapered
Finish and appearance	n/a		Free of any cracks or imperfections that would render it unfit for its designed use	Free of any cracks or imperfections that would render it unfit for its designed use

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