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The mortar used for masonry construction are classified based on strength in IS : 2250 and IS : 1905 according to their designations L1, L2, H1, H2, M1 and M­2. The correct sequence of increasing order of their strength is
1. L1, L2, H1, H2, M1 and M­2
2. L2, L1, M2, M1, H2 and H­1
3. L1, L2, M1, M2, H1 and H2
4. M1, M2, L1, L2, H1 and H2

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Correct Answer - Option 2 : L2, L1, M2, M1, H2 and H­1

As per IS1905:1987, Cl. 3.2.1, Table 1,

Grade of mortar

Minimum compressive strength at 28day (N / mm2)

H1

10

2

6.0 or 7.5

M1

3.0 or 5.0

M2

2.0 or 3.0

M3

1.50

L1

0.70

L2

0.50

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