ASTM D664

ASTM D664 is a standardized test method used to measure the acid number of petroleum products, which indicates the amount of acidic substances present. The acid number helps assess product quality, corrosion potential, and compatibility with other materials. The test involves dissolving the sample in a solvent and titrating it with a base to determine how much acid is in the sample, expressed as milligrams of potassium hydroxide (KOH) per gram of sample. This information is important in refining, formulation, and quality control to ensure products are safe and effective.