| 摘要 |
<p>A coating for protecting constructions against fire and heat, comprises 10 to 80% by weight of aluminous and/or Portland cement and 5 to 20% by weight of hydrated trisodium phosphate (Na3PO4.12H2O). A small but effective amount of a flux can be included, which can be calcium borate and/or fluorspar, the amount being effective to assure superficial sintering of the refractory particles at a temperature between 850 DEG and 900 DEG C. This temperature range is selected because if sintering takes place below 850 DEG C., the cracks which form in the coating are filled too soon by fusion of the inorganic particles under the action of the flux; while if sintering takes place above 900 DEG C., the coating becomes detached from the supporting surface because the binder loses all of its adhesive power. The coating can also include inorganic particles, e.g. alumina, sand, perlite and/or vermiculite, and also organic particles.</p> |
