1.1Â This test method covers the use of a portable refractometer for determining the approximate freezing protection provided by ethylene and propylene glycol-based coolant solutions as used in engine cooling systems and special applications.
4.1Â This practice is commonly used by vehicle service personnel to determine the freezing point, in degrees Celsius or Fahrenheit, of aqueous solutions of commercial ethylene and propylene glycol-based coolant. A durable hand-held refractometer is available that reads the freezing point, directly, in degrees Celsius or Fahrenheit, when a few drops of engine coolant are properly placed on the temperature-compensated prism surface of the refractometer. This refractometer is for glycol and water solutions, and is not suitable for other coolant solutions.
| SDO | ASTM: ASTM International |
| Document Number | D3321 |
| Publication Date | May 1, 2013 |
| Language | en - English |
| Page Count | 4 |
| Revision Level | 13 |
| Supercedes | |
| Committee | D15.03 |