The American Society for Testing and Materials (ASTM) standard specification D3306-21 (2021) shall be used to make the following tests of antifreeze.

1. (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 311°F or 155°C. When added to the cooling system of a motor vehicle, at atmospheric pressure, an antifreeze shall increase the boiling point to a degree not less than the following:

   1. (A) 50% antifreeze: 226° F or 108° C
   2. (B) 40% antifreeze: 221° F or 105° C
   3. (C) 33 1/3% antifreeze: 219° F or 104° C
   4. (D) 20% antifreeze: 214° F or 101° C
2. (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% water, by volume. The pH of this antifreeze solution shall not be below 7.5.
3. (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. (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 the various water antifreeze solutions shall be such as to protect according to the chart in Appendix A of this Chapter.

Added at 9 Ok Reg 2333, eff 6-25-92

Amended at 13 Ok Reg 2409, eff 7-1-96

Amended 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