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What is UL94 Flammability Rating for Cables?

Meeting the industry standards correctly is far more involved than simply choosing the right raw material. As the leading manufacturer for the cable harness and connetors industry, Yeahui has extensive experience and facilities.

UL94, the Standard for the Safety of Flammability of Plastic Materilas for Parts in Devices and Appliances testing, is a plastics flammability standars released by Underwriters Laboratories of the United States .

——From Wikipedia

The flammability rating is calculated for a test specimen as a function of the burning rate and taking account of the material thickness . UL94 differs between a horizontal burning test UL94HB and a vertical burning test UL94V.

UL94HB——Horizontal Burning Test

Test criteria Burning rate in V Flammability rating
Test specimen thickness 3 - 13 mm ≤ 40 mm/min HB
Test specimen thickness ‹ 3 mm ≤ 75 mm/min HB
Flame is extinguished before first mark = 0 mm/min HB


UL94V——Vertical Burning Test

Flammability rating UL 94 V
Test criteria V-0 V-1 V-2
Burning time of each individual test specimen (s)
(after first and second flame applications)
≤10 ≤30 ≤30
Total burning time (s)
(10 flame applications)
≤50 ≤250 ≤250
Burning and afterglow times after second flame application (s) ≤30 ≤60 ≤60
Dripping of burning specimens 
(ignition of cotton batting)
no no yes
Combustion up to holding clamp 
(specimens completely burned)
no no no


Meeting today's standards correctly is far more involved than simply choosing the right raw material . The verification of Yeahui final product to the VW-1 flame test is a complex regularly scheduled procedure. Yeahui is characterized by custom wire harness products .

For more information on our range of UL94 rated cables, please contact our Sales Team: