UL 94 is a plastics flammability standard released by Underwriters Laboratories of the USA. The standard classifies plastics according to how they burn in various orientations and thicknesses. From lowest (least flame-retardant) to highest (most flame-retardant), the classifications are: HB: slow burning on a horizontal specimen; burning rate < 76 mm/min for thickness < 3 mm. V2 burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed.

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  • UL 94 is a plastics flammability standard released by Underwriters Laboratories of the USA. The standard classifies plastics according to how they burn in various orientations and thicknesses. From lowest (least flame-retardant) to highest (most flame-retardant), the classifications are: HB: slow burning on a horizontal specimen; burning rate < 76 mm/min for thickness < 3 mm. V2 burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed. V1: burning stops within 30 seconds on a vertical specimen; no drips allowed. V0: burning stops within 10 seconds on a vertical specimen; no drips allowed. 5VB: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole. 5VA: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may not develop a hole Tests are generally conducted on a 5" x 1/2" (12.7 cm x 1.27 cm) specimen of the minimum approved thickness. For 5VA and 5VB ratings, tests are performed on both bar and plaque specimens, and the flame ignition source is approximately five times as severe as that used for testing the other materials. There are other classifications that apply to low density foam materials (HF-1, HF-2, HBF) and thin films (VTM-0, VTM-1, VTM-2).
  • Die Vorschrift UL94 „Tests for Flammability of Plastic Materials for Parts in Devices and Applications“ (Tests zur Brennbarkeit von Kunststoffen für Teile in Geräten und Anwendungen) der Underwriters Laboratories (UL) beschreibt ein Verfahren zur Beurteilung und Klassifizierung der Brennbarkeit von Kunststoffen. Sie wurde inhaltsgleich in die Normen IEC/DIN EN 60695-11-10 und -20 und die kanadische CSA C 22.2 übernommen.
  • UL 94 é um standard imposto pelo laboratório americano de controlo de qualidade Underwriters Laboratories que examina a inflamabilidade e o comportamento perante o fogo dos materiais plásticos. A designação oficial destes testes é: Tests for Flammability of Plastic Materials for Parts in Devices and Applications O teste tem pelo menos dois componentes: UL 94 HB (Horizontal Burning) - o objecto é testado em posição horizontal face à chama. UL 94 V (Vertikal Burning) - mais exigente, é queimado um objecto em posição vertical, com maior exposição
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  • UL 94 is a plastics flammability standard released by Underwriters Laboratories of the USA. The standard classifies plastics according to how they burn in various orientations and thicknesses. From lowest (least flame-retardant) to highest (most flame-retardant), the classifications are: HB: slow burning on a horizontal specimen; burning rate < 76 mm/min for thickness < 3 mm. V2 burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed.
  • Die Vorschrift UL94 „Tests for Flammability of Plastic Materials for Parts in Devices and Applications“ (Tests zur Brennbarkeit von Kunststoffen für Teile in Geräten und Anwendungen) der Underwriters Laboratories (UL) beschreibt ein Verfahren zur Beurteilung und Klassifizierung der Brennbarkeit von Kunststoffen. Sie wurde inhaltsgleich in die Normen IEC/DIN EN 60695-11-10 und -20 und die kanadische CSA C 22.2 übernommen.
  • UL 94 é um standard imposto pelo laboratório americano de controlo de qualidade Underwriters Laboratories que examina a inflamabilidade e o comportamento perante o fogo dos materiais plásticos. A designação oficial destes testes é: Tests for Flammability of Plastic Materials for Parts in Devices and Applications O teste tem pelo menos dois componentes: UL 94 HB (Horizontal Burning) - o objecto é testado em posição horizontal face à chama.
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  • UL94
  • UL94
  • UL94
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