CFR › Title 27 › Part 21 › §21.108-T27 CFR §21.108-TVerified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Purity. ≥95.0 percent.(b)Color. Colorless to light yellow.(c)Odor. Terpene-like.(d)Specific gravity at 20 °C. 0.70 to 0.80.(e)Boiling point ( °C). 73.