What are materials used in production that do not become part of the finished product referred to as?

Materials used in production that do not become part of the finished product are referred to as maintenance, repair, and operating supplies, often abbreviated as MRO supplies. These materials support the production process but are not incorporated into the final product. They include items such as lubricants, cleaning agents, tools, and safety equipment, which are essential for maintaining machinery and ensuring smooth operations within a facility.

Understanding this terminology is crucial, as it helps differentiate between various types of materials in inventory management. Raw materials are those that are transformed into finished goods, while work in process refers to items still being manufactured. Finished goods are the end products ready for sale. Each category serves a distinct purpose within the production cycle, and recognizing the role of MRO supplies highlights the importance of maintaining operational efficiency.