Section 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.T.D. ATF-133, 48 FR 24673, 6/2/1983. Redesignated by T.D. ATF-442, 66 FR 12854, 3/1/2001