Isikhombisi somgqenya esihluke kahle sesi-Shandong Tonda siyiphiwa ukwenzela ukususa umoya okuphakathi kwezinyathu ezincane kwi-mining, uprosesishoni lwamadwala noma uhluko lomgqenya wesayithi. Ukhishene ngemigca e-150–300 Hz, isikhombisi singakho ameshi we-polyurethane nenqanawa engeziwe (0.05–1 mm) uzama ukwenza izindlovu zokungena umoya ngokushesha ngenxa yezindlovu ezinomsindo ezintshonalanga (njenge-20 mikron). Ukumzekelo kwekhishene kunye nokukhululeka kwamameshi we-polyurethane (Shore D 70–85) uhamba ngendawo yokugcina umoya omkhulu, ubheka ukusebenza ngokubizokuthi kungabiko. Ngenxa yalokho kuphela iminithi yesikhombiso sokuncedisa ngokuba kuhlanganiswa phakathi komunye wamalayini, usebenzisa ukususa imali yokudrya ngaphandle komgqenya ngokufika ku-moisture contents esilandelana ne-10–15%. Faka imboniso nethu ukubonisa iindlela zokuhlukumeza esihluke kahle lokugcina umoya wakho ezincane.