1) ʻO ia ka mea nui o ke kiʻi ʻoniʻoni polyimied kiʻekiʻe, resin, ʻenekinia plastic e like me ka bellows: Polyimide, polyether imide, polyester imide, a polymaleimide, poly aryl amide 2) He mea ia o 3,3',4,4'-Tetraaminodiphenyl Ether ka mea nui monomer o ka moʻo o nā mea polymeric wela heterocyclic ʻono. 3) He mea ia o ke kūpaʻa wela o ka epoxy resin, polyurethane a me nā mea polymer ʻē aʻe a me ka crosslinking agent.