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  Fire doors are an important part of fire-fighting equipment and an important part of fire prevention work
Therefore, the quality and use of fire doors are the key to the success or failure of fire prevention
Fire doors can be divided into steel, wood and steel wood according to material
They can be divided into class a fire doors, class B fire doors and class C fire doors according to fire resistance time
Their fire resistance time is not less than 1
2 hours, 0
9 hours and 0
6 hours respectively
Fire door core filling materials play a major role in the fire resistance and heat insulation performance of fire doors
Therefore, filling materials become the key items of fire door engineering inspection and acceptance
At present, the main fire door core filling materials on the market are vermiculite, aluminum silicate wool, rock wool, inorganic foam and perlite fire boards
1
Vermiculite is a natural, non-toxic mineral, which will expand under the action of high temperature
It is a relatively rare mineral and belongs to silicate
Vermiculite raw ore after high-temperature roasting, its volume can expand rapidly by 8-20 times, and the specific gravity after expansion is 130-180kg/m3, which has strong thermal insulation performance
2
Aluminum silicate cotton refers to the bulk fiber generated by blowing or wire throwing method and assembled by cotton collector or sedimentation device, also known as raw cotton fiber
It has low thermal conductivity and low heat capacity
No corrosive substances
Low thermal conductivity and low heat capacity
3
Rock wool board, also known as rock wool insulation decorative board; Rock wool board is an artificial inorganic fiber made of basalt through high-temperature melting
It has the characteristics of light weight, low thermal conductivity, heat absorption and non combustion
4
Perlite fire door core board is a kind of light and multifunctional new material
It has the characteristics of light apparent density, low thermal conductivity, good chemical stability, wide temperature range, small moisture absorption capacity, non-toxic, tasteless, fire prevention, sound absorption, etc
It is widely used in many industrial sectors
5
Cement foamed fireproof door core is now the most ideal lightweight board for wall insulation and fire prevention
This product has low thermal conductivity, good thermal insulation effect, non combustible, waterproof, high strength, non-toxic and harmful radioactive substances
It does not corrode door panels and is environmentally friendly
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