Building Materials
Sapwood consists of

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

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Building Materials
Cast iron

Is manufactured in required shapes
All listed here
May contain 2 to 5 per cent of carbon with other impurities
Is obtained by purifying pig iron

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