FIRE-PROOFING ELEMENT OF LAMINAR STRUCTURE, ESPECIALLY THAT CONSTITUTING AN INSERT IN PROTECTIVE FIRE-PROOF DOOR, INTERMEDIATE PRODUCT FOR USE IN SUCH FIRE-PROOFING ELEMENT, METHOD OF MAKING SUCH ELEMENT AND METHOD OF MAKING SUCH INTERMEDIATE PRODUCT

摘要

The middle layer (4) consists of an inorganic material, which under temp. influence separates water and remains shape-stable, and is arranged as prefabricated semi-product (5) between the outer layers (2,3) of bound mineral wool. The semi-product is plate-shaped and is strengthened at least on one large surface with an open-pored reinforcement (6,7). The reinforcement is made of glass fleece or glass weave and can be provided on both large surfaces. The semi-product consists of water-sepg. hydroxide, such as aluminium hydroxide and a water-glass, silicon hydrosol or magnesium binder. The hydroxide comprises 50 to 90 wt.% and the binder 10 to 50 wt.%. It has a thickness pref. of 4 to 5 mm.