The flammability UL 94 rating is the most widely used plastic material flammability performance standard. It is used to evaluate the ability of a material to extinguish after being ignited. According to the burning speed, burning time, anti-drip ability and whether the drops are burning, there are many ways to judge. Many values can be obtained for each tested material according to color or thickness. When the material of a certain product is selected, its UL rating should meet the thickness requirements of the wall part of the plastic part. The UL rating should be reported together with the thickness value. It is not enough to report only the UL rating without the thickness.
Our horizontal and vertical combustion tester can fully meet the testing requirements of UL94, IEC 60695-11-10 and IEC 60695-11-20.

The flame retardant grades of plastics are gradually reduced from V-0, V-1, V-2 to HB:

V-0: After the sample is subjected to a 10 second combustion test twice, the flame is extinguished within 30 seconds. No burning objects should fall.

V-1: After two 10-second burning tests on the sample, the flame goes out within 60 seconds. No burning objects should fall.

V-2: After two 10-second burning tests on the sample, the flame goes out within 60 seconds. There may be burning materials falling.

HB: The lowest flame retardant grade in UL94 and CSA C22.2 No 0.17 standards. It is required that for samples with a thickness of 3 to 13 mm, the burning rate is less than 40 mm per minute. For samples less than 3 mm thick, the burning rate is less than 70 mm per minute, or extinguished before the 100 mm mark.

• thickness
• colour
• mass per unit area or density of the product
• application rate and application method for an applied chemical product
• mounting and fixing
• air gap
• substrate
• edge testing
• joint testing