| 摘要 |
<p>Lightweight insulating boards in accordance with the present invention comprise Portland cement, fibers and fillers including: (a) 50-75% by weight of cement, (b) 0-5% by weight of cellulose fibers, (c) 0.5-4% by weight of alkali-resistant fiber material, (d) 5-20% by weight of mica, (e) 5-20% by weight of light filler and (f) 8-25% by weight of hydrated lime. They are shaped into boards from a suspension and are set at least 15 days, and preferably 28 days. The insulating boards of the present invention meet all of the requirements set for such materials regarding flexural strength, incombustibility, and the like.</p> |
