A material that is a gas at 68°F (20°C) or less at an absolute pressure of 14. 7 psia (101. 325 kPa), that is ignitable at an absolute pressure of 14. 7 psia (101. 325 kPa) when in a mixture of 13 percent or less by volume with air, or that has a flammable range at an absolute pressure of 14. 7 psia (101. 325 kPa) with air of at least 12 percent, regardless of the lower limit.