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 4140-01-378-8390
NSN 4140-00-602-5973
NSN 5999-01-228-5509
NSN 6130-01-588-7430
NSN 5910-01-066-1892
NSN 6320-01-272-7072
NSN 5835-01-216-1215
NSN 6685-00-663-9000
NSN 5975-01-389-8660
NSN 5960-01-370-4285
NSN 7035-00-329-4015
NSN 2925-01-408-9362