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failure of a series power switch under single fault conditions

Material Flammability Ratings – Comparative Reference Table

Flammability ratings of different materials can be a bit confusing. For instance, UL 94 V-0 vs V-1, which is more flame retardant?

We’ve pulled this together into one table to make referencing between the tests and standards easier for you.

Material performance increases as we read down the table so HBF is worse than, not equivalent to, VTM-0.

 

Test Classification

Test

Material Performance Worst to

Best

UL 94 Horizontal Burning Foamed Material
ISO 9772

Worst

HF-2 HF-1

HBF

UL 94 Thin Material Vertical Burning
ISO 9773

VTM-2 VTM-1

VTM-0

UL 94 Horizontal Burning
EN 60695-11-10 Method A

to HB-75

HB-40

UL 94 Vertical Burning
EN 60695-11-10 Method B

V-2

V-1

V-0

UL 94 5V Vertical Burning Test
EN 60695-11-20 Method B
Best 5VB

5VA