Section 21.125 - Rubber hydrocarbon solvent(a) Rubber hydrocarbon solvent is a petroleum derivative.(b)Distillation range. When 10 percent of the sample has been distilled into a graduated receiver, the thermometer shall not read more than 170 °F. nor less than 90 °F. When 90 percent has been recovered in the receiver the thermometer shall not read more than 250 °F.T.D. ATF-133, 48 FR 24673, 6/2/1983. Redesignated by T.D. ATF-442, 66 FR 12854, 3/1/2001; 81 FR 59462, 10/31/2016