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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 from the minimum requirements of appropriate ASTM Standard Specifications. The values reported below are provided forinformation and convenience only. Consult manufacturer for more specific values.

MECHANICAL PROPERTIES
Flexural Strength (minimums) (ASTM C 473; tested face up and face down)
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 222 289 267 356 391 445 489 667 622 756 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
11/4 (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 = Gypsum Backing 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 1396 specification:

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 during testingand the amount of handling prior to measurement. In general the value of EI follows the following relationships: Type X Gypsum Board > Regular Gypsum Board Denser Gypsum Board > Less Dense Gypsum Board Machine Direction > Cross Direction Low Relative Humidity > High Relative Humidity
2 2

GA-235-10 Printed in U.S.A

Page 1 of 5

Copyright © Gypsum Association 2010. All rights reserved. Effective Modulus of Rupture (MOR) (minimums)
(Based on Flexural Strengths per ASTM C 1396)
Thickness in. (mm) 3/8 (9.5) 1/2 (12.7) 5/8 (15.9) Machine Direction psi 970 750 660 MPa 6.7 5.2 4.6 Cross Direction psi 350 260 220 MPa 2.4 1.8 1.5

Core, End, and Edge Hardness (minimums)
(ASTM C 473)
Method A* 15 lbf (67 N) Method B* 11 lbf (49 N)

* See ASTM C 473 for a description of Methods Aand B.

Ultimate compressive strength at 70oF (21oC) and 50% Relative Humidity (RH) (Determinations were made from 2" x 2" (50 x 50 mm) or 4" x 4" (100 x 100 mm) samples cut from across the full board width (excluding taper). Samples were conditioned for a minimum of 24 hours and tested in compressive strength machines. Load was applied at a uniform rate until the end point was reached.)Thickness in. (mm) 5/16 (7.9) 1/2 (12.7) 5/8 (15.9) Board Type MH gypsum board regular gypsum board type X gypsum board psi 400 350 400 kPa 2750 2400 2750

Compressive Strength (typical)

Impact Resistance (typical)
(ASTM E 695) (Using 50 lb (22.7 kg) leather bag, one test per specimen. Impact point located at midpoint between studs. Impact Resistance - Drop height at penetration through impactedmembrane.)
Tested on 2x4 (nominal) wood studs 16" (400mm) o.c. 1 Layer in. 1/2 (12.7) 1/2 (12.7) 5/8 (15.9) regular type X type X 12 24 30 mm 300 610 760 in. 30 54 72 2 Layers mm 760 1370 1830 in. 12 24 24 Tested on 3 5/8" (92 mm), 25 gage steel studs 24" (610 mm) o.c. 1 Layer mm 300 610 610 in. 42 54 60 2 Layers mm 1070 1370 1520

Thickness in. (mm)

Board Type

GA-235-10 Printed in U.S.A...
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