How to Choose UL 94 V-0 Flame Retardant Tape
A buyer's guide to UL 94 V-0 flame retardant tape: what the rating means, how it differs from UL 510, and how to specify zero-halogen grades.
When a specification calls for flame retardancy, North-American buyers almost never say "fireproof" — they say UL 94 V-0 or quote a UL test number. Getting this right is the difference between a compliant harness and a failed audit.
What UL 94 V-0 actually means
UL 94 V-0 is the top consumer-electronics flammability rating: when the flame source is removed, the material self-extinguishes within 10 seconds and does not drip flaming particles. It is stricter than V-1 or V-2.
UL 94 V-0 vs. UL 510
They are different tests. UL 510 is the standard for specified PVC, polyethylene and rubber insulating tapes, and UL 510A the one for the wider range of component tapes (our file E544340 sits here); UL 94 V-0 is a general flammability rating for the material. Many automotive and rail specs require both. Always confirm which your drawing calls for.
Specify zero-halogen for premium applications
For rail, aerospace and high-end automotive, add zero-halogen and low-smoke to your requirement — these reduce toxic fumes in a fire. A tape that only claims "high quality" without a stated standard is a red flag.
How to write the requirement
Good: "Cloth tape, UL 510A component file, UL 94 V-0, zero-halogen, 125 °C." Bad: "flame retardant tape." The more specific you are, the faster a manufacturer can match a qualified grade and send certificates.
See our flame retardant tape and acetate cloth tape for UL-recognised grades.
