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UL 94 Flame Classifications


  • UL 94-5VA Surface Burn; Burning stops within 60 seconds, test specimens MAY NOT have a burn-through (no hole). This is the highest (most flame retardant) UL94 rating.
  • UL 94-5VB Surface Burn; Burning stop within 60 seconds, test specimens MAY HAVE a burn-through (A hole may be present)
  • UL 94 V-0 Vertical Burn; Burning stops within 10 seconds, NO flaming drips are allowed
  • UL 94 V-1 Vertical Burn; Burning stops within 60 seconds, NO flaming drips are allowed
  • UL 94 V-2 Vertical Burn; Burning stops within 60 seconds, Flaming drips ARE allowed.
  • UL 94 H-B Horizontal Burn; Slow horizontal burn test (H-B) are considered "self-extinguishing". This is the lowest (least flame retardant) UL94 rating.
  •    (UL94 FLAME RATINGS) UL 94 Flame Classifications
    Links:
  • UL Flammability Video
  • UL 94V-2 Video
  • UL 94 Vertical Burn Test Video
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