The American Society for Testing and Materials (ASTM) standards shall be used to make the following tests of antifreeze.
- (1) Boiling point test. The boiling point of an antifreeze shall be determined by the ASTM standard test method D1120-17 (2017). The boiling point of a concentrated antifreeze shall not be below 305° F or 152° C. When added to the cooling system of a motor vehicle, a 50% antifreeze solution at atmospheric pressure shall increase the boiling point to a degree not less than 219° F or 104° C.
- (2) pH test. The pH of an antifreeze shall be determined by the ASTM standard test method D1287-11 (2020). The pH of an antifreeze shall be run by using a solution composed of 50% concentrated antifreeze and 50% distilled water, by volume. The pH of this antifreeze solution shall not be below 7.5.
- (3) Corrosion inhibition test. The reserve alkalinity of antifreeze as determined by the ASTM standard test method D1121-11 (2020) shall be reported. The corrosion inhibitive properties of antifreeze shall be determined by the ASTM standard test method D1384-05 (2019). The average weight loss of each metal coupon shall not exceed the maximums stated as follows: copper 10 mg, solder 30 mg, brass 10 mg, steel 10 mg, cast iron 10 mg, and aluminum 30 mg.
- (4) Freezing point test. The freezing point of antifreeze shall be determined by the ASTM standard test method D1177-17 (2017). The freezing points of a 50% concentrated antifreeze and 50% distilled water solution shall not be above -26°F or -32°C.
Added at 14 Ok Reg 2494, eff 7-1-97
Amended at 34 Ok Reg 929, eff 9-11-17
Amended at 40 Ok Reg 1790, eff 10-1-23