© NEI 4 IV.EXPLOSION AND FLAMMABILITY SCALE: 0 % FUEL 100 % AIR 0 % AIR 100 % FUEL LEL UEL 1.1% 7.5% TOO LEAN TO BURN TOO RICH TO BURN FLAMMABLE RANGE FLAMMABLE RANGE TLV-TWA -- IDLH FIRE AND EXPLOSION
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