按照国家标准，氧指数的高低决定着阻燃等级。那氧指数是什么呢？氧指数是指在规定条件下，试样在氧氮混合气流中维持平稳燃烧所需要的低氧气浓度，以氧气所占体积的百分数表示。氧指数高表示材料不易燃，氧指数低表示材料易燃。在所规定的试验条件下在室温下材料在O2、N2混合气体中刚好维持发焰燃烧时的小氧浓度以体积的百分率表示。其氧指数越高表明阻燃性能越好。
According to the national standard, the oxygen index determinesthe flame retardant grade. What is the oxygen index? The oxygenindex refers to the low oxygen concentration required by the sampleto maintain stable combustion in the oxygen nitrogen mixed flowunder specified conditions, expressed as the percentage of oxygenin the volume. A high oxygen index indicates that the material isnot flammable, while a low oxygen index indicates that the materialis flammable. Under the specified test conditions and at roomtemperature, the small oxygen concentration of the material in themixture of O2 and N2 just maintains flaming combustion, expressedas a percentage of volume. The higher the oxygen index is, thebetter the flame retardancy is.
0级橡塑与B1级、B2级、B3级橡塑氧指数有什么区别？
What is the difference between rubber and plastic oxygen indexof Grade 0 and Grade B1, B2 and B3?
1、Class0防火性能好,氧指数大于40。
1. Class0 has good fire resistance, and its oxygen index isgreater than 40.
2、B1级：难燃性建筑材料,氧指数大于32。
2. Class B1: nonflammable building material, with oxygen indexgreater than 32.
3、B2级：可燃性建筑材料，氧指数大于26-32之间。
3. Class B2: combustible building materials with oxygen indexgreater than 26-32.
4、B3级：易燃性建筑材料，氧指数小于26。
4. Grade B3: flammable building materials, with oxygen indexless than 26.