UL 94, the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing, is a plastics flammability standard released by Underwriters Laboratories of the United States. The standard determines the material's tendency to either extinguish or spread the flame once the specimen has been ignited. UL-94 is now harmonized with IEC 60695-11-10 and 60695-11-20 and ISO 9772 and 9773.

This is a flame retardant standard issued by the American safety certification company UL (Underwriters Laboratories), mainly used for plastic materials. It includes multiple grades such as V-0, V-1, V-2, HB, etc.

HB: The lowest fire rating in the UL94 flammability standard. It is required that for specimens with a thickness of 3-13mm, burn rate should be less than 40mm per minute; and for specimens with a thickness of less than 3mm, burn rate is less than 70mm per minute, or flame is extinguished before the 100mm mark.

V-2: After two 10-second burning tests are performed on the specimen, the flame is extinguished within 30 seconds, and able to ignite the cotton wool located 30cm below.

V-1: After two 10-second burning tests are performed on the specimen, the flame is extinguished within 30 seconds, and unable to ignite the cotton wool located 30cm below.

V-0: After two 10-second burning tests are performed on the specimen, the flame is extinguished within 10 seconds.

If you are also interested in related tests, you can contact us. Our equipment can perform tests according to the following standards.

• Horizontal and vertical combustion test: UL94 IEC 60695-11-10, IEC 60707, ISO 1210, GB/T 2408; GB 9493-2001
• 50W vertical combustion test: UL94 V-0, V-1, V-2, IEC 60695-11-10, ISO 1210, GB/T 2408, GB/T 5169.16/22;
• 500W vertical combustion test: UL94 5VA, 5VB, IEC 60695-11-20, GB/T 5169.15/17;
• Vertical combustion test of thin film materials: VTM-0, VTM-1 or VTM-2, ISO 9773;
• Test method for combustion performance of foam plastics- Horizontal combustion method: GB/T 8332, ISO 9772: HBF, HF-1, or HF-2
• GB/T 8332-2008, foam vertical combustion performance test