Building Materials
Acrylic sheets

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

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Building Materials
Sapwood consists of

Innermost annular rings around the pith
Thin fibre which extends from the pith outwards and holds the annular rings together
Thin layers below the bark
Portion of timber between heartwood and cambium layer

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