When you buy rubber and plastic insulation materials, some rubber and plastic insulation materials in addition to printed LOGO, will also be printed with class 1 or B1 words. class 1 and B1 are both combustion performance grades, which of these two grades is better? Or are they the same?

class 1 is actually a level of the British building combustion Standard BS476, and Class 1 represents the highest level of flame resistance. In order to reach class 1, the sample burning failure length should not exceed 165mm within 90s, and the sample burning failure length should not exceed 165mm within 10 minutes.

B1 is a grade in China's "Building Materials and Products Combustion Performance Classification", and B1 materials are refractory materials. To reach class B1, the oxygen index of the sample should be greater than or equal to 32.0%; The combustion time should be less than or equal to 30S, and the combustion height should be less than or equal to 250mm; The smoke density grade is less than or equal to 75SDR.

So, rubber insulation material Class 1 is equal to China's flammability B1 level?

Although the two are different in name, they have high similarity in practical application and performance requirements. Class 1 rubber insulation performs well in combustion tests, with a lower combustion rate and flame diffusion capacity, while also producing less smoke and drips. This is consistent with the requirements of B1 class in China, that is, the material has flame resistance, low smoke generation and better self-extinguishing performance.

Therefore, it can be considered that Class 1 of rubber and plastic insulation materials is equivalent to B1 in China in terms of performance. This means that in the selection of rubber insulation materials, if the product is marked as Class 1, then it can be regarded as meeting the requirements of Class B1 in the use of our country. This helps consumers and architects to be more clear about their performance levels when choosing insulation materials, thus ensuring the safety and energy efficiency of the building.