塑料阻燃等级定义及实验方法（Definition and experimental method of flame retardant grades of plastics）.doc

塑料阻燃等级定义及实验方法（Definition and experimental method of flame retardant grades of plastics） DOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Definition of plastic flame retardant grades V-0, V-1, V-2 and HB The flame retardant grades of plastics were progressively reduced to HB by V-0, V-1, V-2: V-0: the flame was extinguished in 30 seconds after two and 10 seconds of combustion test on the sample. No fire can fall. V-1: the flame was extinguished in 60 seconds after the two and 10 second combustion test of the sample. No fire can fall. V-2: the flame was extinguished in 60 seconds after the two and 10 second combustion test of the sample. A fire can fall off. The lowest flame retardant grades in HB:UL94 and CSA C22.2 No 0.17 standards. For samples of 3 to 13 mm thick, burning rate is less than 40 mm per minute; samples of less than 3 mm thick, burning speed less than 70 mm per minute; or extinguished before 100 mm mark. American Standard for flame retardant materials and test methods The flame retardant material standard ANSI/UL-94-1985 standard UL94 test were five: 1. B level of 2. 94V-0, 94V-1, combustion test 94V-2 level vertical burning test 3.94 5-V level vertical burning test with 4. radiation plate flame spread index test (according to the standard ASTM E 162 determination is not introduced here) vertical burning test 5. level 94VTM-0,94VTM-1,94VTM-2 (VTM refers to the thin material is not introduced here) combustion test method of 1.94HB level. The level of combustion test method: test samples with length 127mm, width 12.7mm, maximum thickness is 12.7mm, the minimum thickness of 3.05mm small strip specimens. Test conditions: in a ventilated test chamber. Evaluation method: rated 94HB material, the thickness of the sample is 12.7mm, in the 76.2mm standard from the burning speed is not greater than 38.1mm/min or less than 3.05mm, the thickness of the sample, the