Fire door core

Details Fire door core Fire door core

1995-06-01

1996-09-24

Marcantoni, Paul

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106680, 106772, 106778, 106820, 428703, 428920, 524 8, C04B 1100

Patent

active

055587070

ABSTRACT:
A core for fire doors comprises hydrated gypsum occupying about 40% to 46% of the core volume and bubbles occupying almost all the core volume which is not gypsum. The bubbles preferably comprise about 31% to 38% by volume of larger bubbles of between 1 and 4 mm and about 17% to 25% of smaller bubbles between 0.01 mm and 0.25 mm. The larger bubbles are formed using styrene spheroids.

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