Sulfated Ash

Definition

Sulfated Ash can be used to indicate the concentration of known metal-containing additives in new oils. When phosphorus is absent, barium, calcium, magnesium, sodium and potassium are converted to their sulfates and tin (stannic) and zinc to their oxides. Sulfur and chlorine do not interfere, but when phosphorus is present with metals, it remains partially or wholly in the sulfated ash as metal phosphates.

Standard Test Method Used

ASTM D874

Reporting Measurement

Mass %

Amount of Sample Needed

100 mL