27 C.F.R. § 21.120
Nitropropane, mixed isomers of
(a) Nitropropane content. A minimum of 94 percent by weight.
(b) Total nitroparaffin content. A minimum of 99 percent by weight.
(c) Distillation range. 119° to 113 °C.
(d) Specific gravity at 20°/20 °C. 0.992 to 1.003.