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 5998-01-183-1714
NSN 2925-01-132-5827
NSN 6645-01-503-6337
NSN 5910-00-767-6260
NSN 6320-00-360-1744
NSN 5855-01-624-5332
NSN 4140-00-729-6852
NSN 6320-01-098-2503
NSN 6240-00-571-8449
NSN 5960-01-142-1995
NSN 5925-01-353-9106
NSN 6110-01-052-4114