| 摘要 |
<p>Intumescent sheet material having a matrix whose predominant ingredient is an unfired kaolinitic clay comprising ball clay reinforced by inorganic vitreous fibre (for example, mineral wool) contains heat-expandable graphite as intumescent agent and up to 10 per cent by weight of an organic binder. It is made by dewatering an aqueous suspension of the aforesaid ingredients in the form of a layer which includes cellulose fibre as web-forming agent.</p> |
