IP 4
ASH FROM PETROLEUM PRODUCTS.
This International Standard specifies a method for the determination of the ash content of petroleum products, such as distillate and residual fuel oils, crude petroleum, lubricating oils, waxes and other petroleum products in which any ash-forming constituents present are normally considered to be undesirable impurities or contaminants.
The test method is limited to petroleum products which are free from added ash-forming additives, including certain phosphorus compounds