The fire rating of polyurethane sandwich panels is divided according to the national standard: B1, B2, B3. The highest fire rating of edge sealed polyurethane sandwich panels is a (there is no such fire rating for polyurethane sandwich panels in the national standard. Because the core materials in polyurethane sandwich panels are filled with rock wool, glass wool and other core materials, the fire rating of rock wool is a, so many customers in the market who demand polyurethane sandwich panels define the fire rating as a), Therefore, the polyurethane edge sealing rock wool (glass wool) sandwich panel commonly known by customers in the market is class A.
Therefore, the fire rating of polyurethane sandwich panel can be divided into B1, B2, B3 and class A (polyurethane edge sealing rock wool (glass wool) sandwich panel commonly known by customers in the market). Next, we will talk about the fire rating of polyurethane sandwich panel in detail.
Class B1 fireproof polyurethane sandwich panel – fire retardant building materials
Refractory materials have better flame retardancy. It is difficult to catch fire in the air or under the action of high temperature, and it is not easy to spread quickly, and the combustion will stop immediately after the fire source is removed.
According to the national standard: high oxygen index means that the material is not easy to burn, and low oxygen index means that the material is easy to burn. Generally, it is considered that the oxygen index ＜ 22 belongs to combustible material, the oxygen index between 22 and 27 belongs to combustible material, and the oxygen index ≥ 27 belongs to non combustible material.
Class B1 fireproof polyurethane sandwich panel refers to the oxygen index ≥ 27. The most direct way to test the fire rating of polyurethane sandwich panel is to ask the manufacturer for the monitoring report, and the most direct way is to take a lighter and ignite it. If the non combustible phenomenon is obvious, it is Class B1 fireproof.
② Class B2 fireproof polyurethane sandwich panel – combustible building materials
Combustible materials have certain flame retardancy. In case of open fire in the air or under the action of high temperature, it will not ignite immediately, but it will burn after a period of time, which is easy to cause the spread of fire.
The B2 fire-resistant polyurethane sandwich panel refers to the oxygen index of 22-27. It can be seen that the B2 fire-resistant polyurethane sandwich panel is combustible but not easy to burn.
③ Class B3 fireproof polyurethane sandwich panel – flammable building materials
Without any flame retardant effect, it is extremely easy to burn and has great fire risk.
Class B3 fireproof polyurethane sandwich panel refers to the oxygen index ＜ 22, which can only be applied to customers without fire protection requirements.
Post time: Aug-25-2022