In some medical grade or construction units with higher requirements, everyone will pay attention to whether the decorative materials can pass B1 level permanent flame resistance.
Is flame resistance the same as non-flammable? What is Class B1 flame resistance? Does B1 grade flame proof have permanent and non-permanent? Here, we learn about B1 class flame resistance.
1. The difference between flame resistance and non-flammable.
Scrim backed PVC wall covering has an advantage that other wall coverings and wallpapers cannot achieve. It is that mesh backed PVC commercial wall covering can achieve B1 level permanent flame resistant. This is because in the production of PVC, flame retardant additives are added through the previous procedure.
The flame resistance of fabric wall coverings is post-processing, which cannot achieve the effect of permanent flame resistance. The flame resistance of PVC wall coverings is achieved by adding flame retardants during production.
So, what is the difference between flame resistance and non-flammable? According to the national standard, it can be divided into A-level non-combustible and B-level flame-resistance. Non-combustible usually refers to inorganic materials: such as stone, glass, etc.
Flame resistance refers to the fact that it is combustible, but by adding flame retardants and other treatments, it has the property of significantly delaying the spread of flames.
What exactly can be called B1 flame resistance? In practice, there is a very simple test standard. That is, it will automatically go out within three seconds after leaving the open flame.
The National Building Materials Testing Center needs to measure the combustion raising rate index, total heat release within 600 seconds, lateral flame spread, smoke generation rate index, smoke production toxicity, smoke production within 600 seconds, combustion droplet particles and other indicators for authoritative testing, only those that meet the national standard GB 8624-2012 (or American standard/European standard: ASTM E84) are called B1-level flame resistant wall coverings.
2. Regarding permanent flame resistance and non-permanent flame resistance:
PVC wall covering B1 flame retardant is also divided into permanent and non-permanent.
Fire resistance wall coverings can be simply divided into permanent flame resistance and non-permanent flame resistance according to their durability. The flame resistance of paper or fabric wallpaper is post-processing, that is, the effect of flame-resistance is achieved by soaking and spraying the flame retardant. With the change of time, its effect will weaken after the flame retardant volatilizes, which is called non-permanent flame resistance. In the production process of calenderer PVC film wall coverings, the flame retardant is processed in the previous procedure, and the flame retardants and additives are mixed with raw materials in the previous process and produced to the calenderer film, and the effect will not change. It is called permanent flame resistance.