CLASS
1
TEMPERED
2
STANDARD
3
SERVICE
TEMPERED
4
SERVICE
5
INDUSTRIALITE
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
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
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
1/8
3/16
1/4
3/8		 35
30
30
20		 30
30
25
15		 4500 2000 75
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
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
1
1-1/8		 25 20
   
HARDBOARD - Products and Services • Classifications • Manufacturing Process  

 

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