What is the UL94 Flammability Standard?

You may usually hear UL94HB , UL94-V0 , UL94-V1, but you may not know what’s this really about.

The UL94 is the test for Flammability of Plastic Materials for Parts in Devices and Appliances, which is a plastics flammability standard to show the material’s tendency to either extinguish or spread the flame once the specimen has been ignited.

It usually classify to 12 standards: HB, V-0, V-1, V-2, 5VA, 5VB, VTM-0, VTM-1, VTM-2,HBF,HF1,HF2
Among them HF-1, HF-2, HBF apply to low density foam materials and VTM-0, VTM-1, VTM-2 thin films.
And HB,V-2,V-1,V-0,5VB ,5VA,is from lowest (Least flame-retardant) to highest (Most flame-retardant)

Level Test Methods:
1) HB: Horizontal Burning Test
2) V0-V2: Vertical Burning Test
3) 5VA/5VB: 500w (125 mm) Vertical Burning Test
4) RP Class: Radiant Panel Flame Spread Test
5) VTM0-VTM2: Thin Material Vertical Burning Test
6) HF1-HF2: Horizontal Burning Foamed Material Test

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