This standard is a fundamental method standard for the testing of rubber materials. It systematically describes a general method for determining the ash content (i.e., inorganic residues after ignition) in raw rubber, compounded rubber, or vulcanized rubber using a muffle furnace under high-temperature conditions. The standard specifies three specific operational procedures—Method A, Method B, and Method C—to address rubber materials with different compositions (e.g., whether they contain halogens). It explicitly states that these methods may yield different results due to differences in their principles. The core testing instrument required for its implementation is a laboratory muffle furnace (also known as a high-temperature furnace or ash analyzer) that complies with the specifications. This standard provides a unified and authoritative testing basis for evaluating the purity of rubber raw materials and the content of inorganic fillers in formulations.