Building Materials
For the manufacture of Portland cement, the proportions of raw materials used, are

Lime 22% ; silica 63% ; other ingredients 15%
Lime 63% ; silica 22% ; other ingredients 15%
Silica 40% ; lime 40% ; other ingredients 20%
Silica 70% ; lime 20% ; other ingredients 10%

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Building Materials
Acrylic sheets

Possess the light transmission rate of 93%
Are generally unaffected by most household detergents
All of these
Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness

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