The PVC shim stock has a transparent clear color to indicate thickness, meets Federal Specification L-P-535, and has a standard tolerance. PVC (polyvinyl chloride), also known as vinyl, is a durable, nonconductive plastic that resists corrosion, many chemicals, and oils. The transparent clear color indicates thicknesses of 0.040", 0.050", and 0.060".
Shim stock is very thin material that can be fabricated into specific shapes.