Thermal insulation rock wool is melted into fiber at high temperature and solidified by adding an appropriate amount of binder. It has good fire resistance and is a commonly used filler for fire doors. It also has certain sound insulation and heat preservation effects; High strength, can provide better support for the door.
Polyurethane waterborne foam has good sealing property, can effectively block air circulation, warm and sound insulation effect is good; Due to the combination of polyether water as blowing agent, green, safe, environmental protection; The overall weight of the door is heavier, the strength is higher, and the impact resistance is better. It has the characteristics of high temperature resistance above 200℃ and long service life.