Composition

Density, g/cm³

Impact elasticity, kg/cm²

Bending strength, kg/cm²

I a

2.920

1.5

162

I b

2.779

1.6

160

I c

2.694

1.5

150

II a

2.913

1.6

110

II b

2.786

1.6

112

II c

2.672

1.7

114

III a

2.948

3.0

146

III b

2.816

2.8

150

III c

2.697

2.1

140

Window glass

2.5

2.0

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