A gas or mixture of gases having, in a container, an absolute pressure exceeding 40 psi at 70 °F (21 °C); or
a gas or mixture of gases having, in a container, an absolute pressure exceeding 104 psi at 130 °F (54,4 °C) regardless of the pressure at 70 °F (21 °C), or
a liquid flammable material having a vapor pressure exceeding 40 psi at 100 °F as determined by ASTM D-323-7.