Thermcraft - Model ASTM D874 -Ashing Furnaces
ASTM D874 is the standard test method for sulfated ash from lubricating oils and the additives they contain. The sulfated ash is measured as it can be used to indicate the concentration of known metal-containing additives in new oils. These additives often contain one or more of the following metals: tin, sodium, potassium, zinc, magnesium, calcium, and barium. When phosphorus is absent these metals are converted to their sulfates or oxides. This test method is applied to sulfated ash levels below 0.02 mass% but it is restricted to oils containing ashless additives. 0.005 mass% sulfated ash is the lower limit of the test method.
Knowing the amount of ash-forming material present in a product can be used to determine whether the product is suitable for use in an application. This blog post will look at some of the standards used to measure ash produced in industrial furnaces.