21001292B080050000 is a part number for a Quadrant Standard Nylon Plastic Sheet, which is an engineering-grade acetal copolymer product used for mechanical and electrical insulation. It has excellent dimensional stability, good machinability, and superior strength, making it a great choice for many industrial applications. It is highly resistant to a variety of chemicals, solvents, and water, and is available in thicknesses ranging from 0.031 inches to 1 inch.