Building Materials
Sapwood consists of

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

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Building Materials
Cast iron

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

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