UL 94 (Underwriters Laboratories test standard UL 94) is the most widely used test for determining a specimen's relative flammability, its ability to extinguish the flame after ignition and its dripping behavior. UL94 covers two types of testing: vertical burn and horizontal burn.
We chose to highlight the most common ratings found in plastics: HB = Slow burning; V2=extinction within 30 seconds + Dripping; V1= extinction within 30 seconds, No Dripping; V0= extinction within 10 seconds, No Dripping.
Other tests and ratings are possible according to UL 94. Vertical Testing (5V, 5VA, 5VB): testing is done on both bar and plaque specimens. Vertical Testing of Thin Materials (VTM-0, VTM-1, VTM-2): test used for thin materials, or materials that are too flexible or may distort, shrink or flex during the traditional vertical testing.
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