Isihlahla esikhathalekileyo kweShandong Tonda, esishiyene ngepolyurethane, yehlobo eliphambili lokusebenza ngokuphakamisayo imibuzo yamathebhu okukhaphazekileyo, njengomining, ukususa nokulinganiswa komlingane. Ingenziwe ngeminye yi-MDI ye-polyurethane nesithole D hardness yesi-85–95, uyahlula i-rubber kunye ne-steel meshes ngeminyaka engu-2–5 ngokusebenzela kakhulu kumabhi ngokubhekisisa. Ukusetyenziswa kwesihlahla sijwayelekileyo kanye nokuthola kwe-apertures kuhlukele amagcindebe olungaphandle lokugcwalisiwa kunye nokuhlukanisa ukubhekisisa, phakathi kakhulu nokuphucukeleka kwe-elastic recovery (≥90%) esiqinisekisa isicwangciso sesikhathi. Ukuhlawulwa kwi-mining operations ezinikezela amadaka kakuhle njenge-iron ore kunye negranite, uhlanganisa umoya wensikati wesilayezelo lesi-10,000+ ngokushesha ngenqanawe yokusebenza. Bonisa nethemba lokufika kokuthi uhlola izinhlelo zokusebenzela kwe-sihlahla esikhathalekileyo sokugcwaliswa okudingeka.