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Summary of UL 94 Categories
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HB |
Slow burning on a horizontal specimen burning rate
< 76 mm / min for thickness < 3 mm |
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V-0 |
Burning stops within 10 seconds on a vertical specimen; no drips allowed |
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V-1 |
Burning stops within 30 seconds on a vertical specimen; no drips allowed |
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V-2 |
Burning stops within 30 seconds on a vertical specimen;
drips of flaming particles are allowed |
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5V |
Burning stops within 60 seconds after five applications of flame |
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5VB |
Plaque specimens may have a burn-through (have a hole) |
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5VA |
Plaque specimens may not have a burn-through (no hole) - highest UL rating |
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