Isikhumba esishesha kweShandong Tongda sokuqala lesi polyurethane siphakemeleyo ukusuka nokuphucula amandla, uhlola izilungiselelo ezinethile zokusebenzisa phakathi komkhankho omncane. Isikhumba sikudingiswa ngamoduli ezinikezeli, uzokususa okushesha ukufinyelela amandla akhona noma ukubonisa indawo yokusetshenziswa emidvo yezinto. Wonke umodi lwaphinda isikhundla sokusetshenziswa sesi polyurethane nge-parameters ezinikezela ukuthatha nokuvibela, uvumelela uphumaphumo olukhulu lokulandelana ngephakemeleyo. Lomdlobi wemoduli uhlanganisa idindima yokusebenza lokunyusa ukwakhulisa kanye nokuhlola ukuba kuhloniphe kunye nokuzisiza kwiseva elincinci. Kuyindlela lokuncane lokusebenza kumafutha, ukusebenzisa amacababi nokuphucula amandla eziqondisiwe, ukuze lizama ukugcina ukusetyenziswa ngenkinga lokusebenza. Bonisa nethu ukubaleka imoduli noma ukusombulula nezintloko ezikhoyo.