Shandong Tongda’s isemayi esingazixhelwa ngechemical polyurethane yikholelwa ukwenzela ukuba uqondile amaxhalelo omncane kumakhemikali ezingaphandle kakhulu zokuthengisa ezindlaleni zokusemthetha, ukubhukiswa okuphakamisi, noma iimphumelelo zakhemikali. Isibhedlela sijabulile ngomlando wefluorine wapolyurethane, usetyenziswa ukususa ukungaziphambili kwezinkxaso (ngokusho, HCl, H₂SO₄), izintshiseko (ngokusho, NaOH), kunye neziphethiso (ngokusho, acetone). Ikhetho ekufunekayo kwiimbhuzi 2–13, isemayi siyihlanu sisathuliwe imithombo yakhe nokusebenza kakhulu phambi komhlawulo wesikhatsi esidingeni. Ukulinganiswa kwakhiwo lwakhe luchaze ukubonakala kwezinto ezinikezeliyo, uzokusetyenziswa kumakhiwo yokugcina noma ukusebenziswa kwisebentle. Isibhedlela singamaqa omandleni ukuvula ukuxheleni, xa ihlobo lokusebenza luhlanganisa ukusuka kwechemical absorption. Phinda ukubiza nomuntu ukubona amandla akhemikali nokuhlola amandla amaculembo edingekayo.