U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
(a) Color. White or yellow.
(b) Specific gravity at 20 °C. 1.95 to 2.10.
(c) Melting point. 360 °C.
(d) Boiling point. 1320 °C.
(e) pH (0.1M solution). 13.5.
