We perform testing by ASTM D874 to measure sulfated ash in lubricants by igniting the sample burning it in a crucible until only ash and carbon remain. Ash-forming materials may be present in biodiesel in three forms, including abrasive solids, soluble metallic soaps, and unremoved catalysts. These are usually left over from the biodiesel refining process. Abrasive solids and unremoved catalysts can contribute to injector, fuel pump, piston and ring wear, and also to engine deposits. Soluble metallic soaps have little effect on wear but may contribute to filter plugging and engine deposits.
ASTM D874 applies to unused lubricating oils containing additives and from additive concentrates in biodiesel. The sample is ignited and burned in a crucible until only ash and carbon remain. After cooling, the residue is treated with sulfuric acid and heated at 775°C until carbon oxidation is complete. The ash is then cooled, re-treated with sulfuric acid, and heated at 775°C to constant weight. The final weight is the sulfated ash content.
We also perform ash testing by ASTM D482, ASTM E2403, DIN 51575, IP 4, and ISO 6245. These different test methods use different instruments or procedures or are used for certain sample types. Click on the test method number to learn more about each test.
Sample quantity required: 200 ml
For additional information on this test method or to purchase a copy of the method, please click HERE to open a new window and visit the ASTM website.
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