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Non-flammable degree Thickness 1/8°above Thickness 1/8°below HB HB Burning speed 1.5 inch/min below HB Burning speed 3.0 inch/min below     V-0 V-1 V-2   Each sample's 1st and 2nd burning time   Less than 10 second?/td>   Less than 30 second   Less than 30 second   Sum of each sample's 2nd burning time and glowing time   Less than 30 second   Less than 60 second   Less than 60 second   Sum of each sample's 2nd burning time and glowing time   Less than 50 second   Less than 250 second  Less than 250 second   Ignition of cotton caused by flame drop   should be none   should be none   should be none   判定基準 5VA 5VB note 燃焼時間およびGlowing時間の合計　　 60秒 60秒 承認可否 NO NO 試片中央のホール発生有無 NO Yes Plaque Test