| 摘要 |
<p>A board or sheet product having a density of at least 1300 Kg/ml<3> is formed from a non-asbestos composition comprising (i) an inorganic binder or the precursors thereof in an amount of at least 75% of the composition on a dry weight basis, and (ii) from 2 to 25%, on the same basis, of cotton having a freeness of 20-80 DEG (Schopper Riegler). The cotton, which suitably comprises first cut linters, is preferably processed to a freeness of 25-40 DEG S.R. The impact resistance of the products may be improved by including in the initial mix synthetic organic fibres, e.g. polypropylene fibres.</p> |
