Building Materials
Sapwood consists of

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

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Building Materials
Cast iron

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

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