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Classifications

CLASS Nominal
Thickness
WATER RESISTANCE
(MAX. AVG. PER PANEL)
MODULUS OF RUPTURE
(Min. Avg.Per Panel)
TENSILE STRENGTH
(Min. Avg. Per Panel)
Water Absorption
Based On Weight
Thickness
Swelling
Parallel
to Surface
Perpendicular
to Surface
1 TEMPERED INCH PERCENT PERCENT PSI PSI PSI
1/2 30 25 6000 3000 130
1/10
1/8
3/16
25 20
1/4
5/16
3/8
20
15
10
15
10
9
2 STANDARD 1/2 40 30 4500 2200 90
1/10
1/8
3/16
35 25
1/4
5/16
3/8
25
20
15
20
15
10
3 SERVICE
TEMPERED
1/8
3/16
1/4
3/8
35
30
30
20
30
30
25
15
4500 2000 75
4 SERVICE 1/8
3/16
1/4
3/8
7/16
1/2
5/8
11/16
45
40
40
35
35
30
25
25
35
35
30
25
25
20
20
20
3000 1500 50
3/4
13/16
7/8
1
1-1/8
20 15
5 INDUSTRIALITE 1/4
3/8
7/16
1/2
5/8
11/16
50
40
40
35
30
30
30
25
25
25
20
20
2000 1000 25
3/4
13/16
7/8
11-1/8
25 20