General:
Engine fuels having a vapor pressure no greater than 124 kPa (18 psi) at 37.8 °C (100 °F), are tested by one of two procedures.
- Procedure A involves the use of a pressure vessel
- Procedure B involves the use of a vented test tube.
The result of the test is based on a visual rating that is classified as an integer in the range from 0 to 4
Precision:
The standard includes repeatability and reproducibility statements derived from interlaboratory testing.
Results are expressed as a silver strip corrosion rating (e.g., 1a, 2b, 3).
Detailed precision values for different rating levels are provided in the full ASTM document.
Test:
A polished silver strip is immersed in the fuel sample and heated under controlled conditions (specified temperature and time). After the test, the strip is rated for corrosion by visual comparison with standard reference strips (rating scale typically 0 to 4 with descriptive tarnish/corrosion levels).