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UL94. FLAMMABILITY RATINGS

Rating Test Criteria
UL.94.V-0
  • The test samples are extinguished within 5 seconds average time
  • None of the test samples burned longer than 10 seconds
  • No test samples emit burning particles
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    UL.94.V-1
  • The test samples are extinguished within 25 seconds average time (mean of 10 successive tests).
  • None of the test samples burned longer than 30 seconds
  • No test samples emit burning particles
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    UL.94.V-2
  • The test samples are extinguished within 25 seconds average time (mean of 10 successive tests).
  • None of the test samples burned longer than 30 seconds
  • The test samples emit burning particles during the test
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    UL.94.HB In all of the above the tests, the samples are extinguished. So, if the sample keeps burning beyond 25 seconds, a horizontal test can be carried out to reach classification 94.HB
  • Horizontal test uses samples of a defined thickness which must not burn faster than prescribed by UL.
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