Building Materials
Sapwood consists of

Portion of timber between heartwood and cambium layer
Thin layers below the bark
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
When a brick is immersed in water for 24 hours and then dried, if

10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
All listed here
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
No grey or white deposits appear on the surface, the brick is free from soluble salts

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