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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  • 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 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; drips of particles allowed as long as they are not inflamed. V0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed. 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).
  • UL94 é um padrão imposto pelo laboratório americano de controlo de qualidade Underwriters Laboratories (UL) 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: UL94 HB (Horizontal Burning) - o objecto é testado em posição horizontal face à chama. UL94 V (Vertikal Burning) - mais exigente, é queimado um objecto em posição vertical, com maior exposição.
  • UL94是一個由美國Underwriters Laboratories公司發佈的塑膠可燃性標準。這標準根據不同厚度的塑膠燃燒的情況來將塑膠分類。從最低（最小阻燃性）到最高（最大阻燃性）的分類為： HB: 在水平摆放的样本上缓慢燃烧，对于厚度小于 3mm 的材料燃烧速度小于 76 mm/min V2: 在垂直摆放的样本上30秒内停止燃烧，允许滴下燃烧的颗粒 V1: 在垂直摆放的样本上30秒内停止燃烧，允许滴下不燃烧的颗粒 V0: 在垂直摆放的样本上10秒内停止燃烧，允许滴下不燃烧的颗粒 5VB: 在垂直摆放的样本上60秒内停止燃烧，不允许滴下，允许样本上出现洞 5VA: 在垂直摆放的样本上60秒内停止燃烧，不允许滴下，也不允许在样本上出现洞 測試一般使用一塊 5 英寸乘以 0.5 英寸樣本。針對 5VA 和 5VB 兩類評級，會對條狀和片狀的樣本進行測試，而焰的強烈程度大約是用於測試其他材料的五倍。還有其他的分類適用於低密度泡沫材料（HF-1, HF-2, HBF）和薄膜（VTM-0, VTM-1, VTM-2）。
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  • 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.
  • UL94是一個由美國Underwriters Laboratories公司發佈的塑膠可燃性標準。這標準根據不同厚度的塑膠燃燒的情況來將塑膠分類。從最低（最小阻燃性）到最高（最大阻燃性）的分類為： HB: 在水平摆放的样本上缓慢燃烧，对于厚度小于 3mm 的材料燃烧速度小于 76 mm/min V2: 在垂直摆放的样本上30秒内停止燃烧，允许滴下燃烧的颗粒 V1: 在垂直摆放的样本上30秒内停止燃烧，允许滴下不燃烧的颗粒 V0: 在垂直摆放的样本上10秒内停止燃烧，允许滴下不燃烧的颗粒 5VB: 在垂直摆放的样本上60秒内停止燃烧，不允许滴下，允许样本上出现洞 5VA: 在垂直摆放的样本上60秒内停止燃烧，不允许滴下，也不允许在样本上出现洞 測試一般使用一塊 5 英寸乘以 0.5 英寸樣本。針對 5VA 和 5VB 兩類評級，會對條狀和片狀的樣本進行測試，而焰的強烈程度大約是用於測試其他材料的五倍。還有其他的分類適用於低密度泡沫材料（HF-1, HF-2, HBF）和薄膜（VTM-0, VTM-1, VTM-2）。
  • 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.
  • UL94 é um padrão imposto pelo laboratório americano de controlo de qualidade Underwriters Laboratories (UL) 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: UL94 HB (Horizontal Burning) - o objecto é testado em posição horizontal face à chama.
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  • UL94
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