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Question
As specified in IS : 3087, the average modulus of rupture of 'flat pressed three layer' of Grade-I pre-laminated particle board is
A.
15 N/mm2
B.
10 N/mm2
C.
12.5 N/mm2
D.
11 N/mm2
Answer ( Option A)

15 N/mm2

Solution

IS : 3087 : 2005 Table : 1
Property Flat Pressed single layer Flat pressed three-layer multi-layer 
Grade - I Grade - II
Modulus of Rupture, N/mm2
(i)  Average 11 15 11
(ii) Minimum 10 13 10
Modulus of Elasticity, N/mm2
(i)  Average 2000 2500 2000
(ii) Minimum 1800 2250 1800

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