ACTIVE SULFUR IN CUTTING OILS: ASTM D1662
EXPLANATION
This test measures the amount of sulfur available to react with metallic surfaces to form solid lubricating aids at the temperature of the test. The rates of reaction are metal type, temperature, and time dependent. It has not been determined as to how the active sulfur content thus determined may relate to field performance of the cutting fluid.
TEST SUMMARY
A sample is treated with copper powder at 149° C or 300° F. The copper powder is filtered from the mixture. Active sulfur is calculated from the difference between the sulfur contents of the sample, as determined by Test Method D129, before and after treatment with copper.
TEST PRECISION
Precision is not known at present since a round robin has not been completed.
