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nature : also known as spontaneous combustion point and autoignition temperature. Under the conditions, combustible material without external source of the fire that occurred in the minimum temperature combustion. China provides gas, vapor ignited by dangerous substances temperature divided into six groups : ignition temperature T> 450 ° C for T1 Group, 300 ° C <T �450 ° C for T2 Group, 200 ° C <T �300 ° C for T3 Group, 135 ° C <T �200 ° C for T4 Group, 100 ° C < ; T �135 ° C for T5 group. 85 ° C <T �100 ° C for T6 group. Powder, fiber dangerous substances ignited by temperature divided into three groups : ignition temperature T> 270 ° C for Tll Group, 200 ° C <T �270 ° C for T12 Section 140 ° C <T �200 ° C for T13 group.
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