Fire protection element with layer structure, especially for inserts in fire doors, and semi-finished products

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.