What is the highest flammability rating?

The maximum flammability rating refers to a substance's ability to burn under fire conditions. The highest flammability level commonly used is the UL94 standard, which divides flammable materials into different levels: V-0, V-1, V-2, HB, etc.

 

- V-0 level: In the flame burning test of the material, the flame extinguishing time does not exceed 10 seconds, and there is no burning dripping.

- V-1 level: In the flame burning test of the material, the flame extinguishing time does not exceed 30 seconds, and there is no burning dripping.

- V-2 level: In the flame burning test, the flame extinguishing time of the material does not exceed 30 seconds, and there is burning and dripping.

- HB grade: In the flame burning test of the material, the flame extinguishing time does not exceed 30 seconds, and there is burning and dripping, but it will not ignite the standard paper.

 

It is important to note that different materials and products may have different maximum flammability rating requirements. Specific grade requirements should be determined based on relevant industry standards and regulations.

 

 

The test method for flammability testing can vary depending on the specific standard or regulation being followed. One commonly used test method for flammability testing is the 45° Flammability Tester, which measures the flammability of materials at a 45-degree angle. This test method involves applying a small flame to the material surface and observing its behavior, such as flame spread, burn time, or self-extinguishing properties.

 

Other test methods may include the Vertical Burn Test (ASTM D6413), the Horizontal Burn Test (ASTM D635), or the Oxygen Index Test (ASTM D2863), among others. These methods assess the flammability characteristics of materials in different orientations and conditions.

 

It's important to consult the specific testing standards or regulations applicable to your industry or region to determine the appropriate test method for flammability testing.