GYPSUM BOARD TYPICAL MECHANICAL AND PHYSICAL PROPERTIES
(GA-235-10)
The properties described herein were either obtained from laboratory tests conducted under controlled test conditions as set forth in appropriate standards, compiled from manufacturers' literature, or taken fromthe minimum requirements of appropriate ASTM Standard Specifications. The values reported below are provided for information and convenience only. Consult manufacturer for more specific values.

MECHANICAL PROPERTIES
Flexural Strength (minimums) (ASTM C 473; tested face up and facedown)
Method A Type of Gypsum Board
(Note 1) (Note 2)

Method B Bearing Edges Perpendicular to Length lbf 46 62 56 77 85 97 107 147 137 167 228 N 205 276 249 343 378 431 476 654 609 743 1010

(Note 2)

Thickness in. (mm)

Bearing Edges Perpendicular to Length lbf N 222 289267 356 391 445 489 667 622 756 1020

Bearing Edges Parallel to Length lbf 20 25 25 30 32 35 40 50 50 60 80 N 89 111 111 133 142 156 178 222 222 267 356

Bearing Edges Parallel to Length lbf 16 21 21 26 28 31 36 46 46 56 77 N 71 93 93 116 125 138 160 205 205 249 343

a, b a, g a,b, e, f e g a, b, c, d, e, f, h a, c, d, e, f b a, b
1

1/4 (6.4) 5/16 (7.9) 3/8 (9.5) 3/8 (9.5) 4/10 (10.2) 1/2 (12.7) 1/2 (12.7) 5/8 (15.9) 5/8 (15.9) 3/4 (19.0) 1 (25.4)

50 65 60 80 88 100 110 150 140 170 230

a = Gypsum Wallboard and Predecorated Gypsum Board b = GypsumBacking Board and Gypsum Coreboard c = Water-Resistant Gypsum Backing Board d = Exterior Gypsum Soffitt Board e = Gypsum Sheathing Board f = Gypsum Base for Veneer Plaster g = Gypsum Lath h = Gypsum Ceiling Board 2 See ASTM C 473 for a description of Methods A and B

ASTM C 1396specification:

Effective Stiffness (EI)* (typical range)
Board Thickness (in.) Lb•in /in of width kN•mm /mm of width 1/2 1500 to 4000 220 to 580 5/8 3000 to 8000 440 to 1,160 * EI is dependent on board density, relative humidity, type of board, paper type, direction of board [continua]

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