When choosing polyurethane fire-proof board, general manufacturers will provide B1, B2, B3 three fire-proof grades for customers to choose.
What determines the fire protection level of polyurethane board? How to judge the fire grade of polyurethane board?
The control of three fire-proof grades of polyurethane board mainly depends on the proportion of black and white material. Polyurethane Board white material is divided into B1, B2 and B3 grades, while polyurethane black material is mainly determined by the amount of feeding. The division of fire protection grade is usually determined by the size of oxygen index. The oxygen index of the core material of grade B1 fireproof board must be greater than or equal to 32 during combustion test, while the oxygen index of the core material of grade B2 fireproof board must be greater than or equal to 26 during combustion test, and the core material of grade B2 fireproof board should be regarded as grade B3 plate. In the absence of professional instruments, there is also a simple way to test the fire resistance of the core material. Take a small piece of core material, ignite it with a lighter, leaving the fire without extinguishing and dropping the burner is grade B3, leaving the fire without extinguishing is grade B2, and not easy to ignite is grade B1.
What are the factors that affect the price of polyurethane board with the same fire protection grade?
The main factors affecting the price of polyurethane board are polyurethane black and white. The polyurethane board made of good quality polyurethane black and white has good stability, little influence by temperature and stable product. Therefore, the price of finished product of polyurethane board will be higher. The polyurethane products made of poor quality black and white polyurethane have poor stability and limited tolerance to temperature difference. They are very vulnerable to shrinkage caused by temperature difference. So the price of polyurethane board products is also cheaper!