Material is vellumoid which is a trade name for a specific paper & glue product.
A deformable material which prevents the passage of matter through the joint formed when two faces are joined. It may be metallic or nonmetallic, lubricated or impregnated, solid or hollow cross section. It may be made to any predetermined dimension and shape. Excludes flat disks, items made of felt material and items having joints. For round metal and plastic items with an aperture and a solid rectangular cross section, see washer, flat; shim; bearing, washer, thrust; and spacer ring. Excludes disk, valve; seal, nonmetallic angle; seal, nonmetallic channel; seal, nonmetallic special shaped section; shielding gasket, electronic; and ring, sealing jar.
NSN 4140-01-260-4156
NSN 5855-01-653-1591
NSN 5996-00-830-8976
NSN 6685-01-183-8096
NSN 6685-01-153-1846
NSN 6685-01-599-5186
NSN 5930-01-346-2588
NSN 5985-01-286-7076
NSN 6105-01-227-3003
NSN 5855-01-502-6414
NSN 5905-01-204-9412
NSN 5985-01-530-9369