Amasikhwama asihlahla esihulu esingabili kunye namandla akhawulekanga ngaphandle komsebenzi wokuhlola. Ukushosha ngokupheleleyo ngezindaweni ezifaneleyo zokususa amanye amagunyaziso njengamachloride okanye amacitric acid ezahlukene amaphathelane. Njengamasikhwama asihlahla esizungezeleyo isintsi okanye amachemical, i-duplex grades ibheka ukungavumelekani. Bheka amahambo nokuvavanya, okungakhiyiweyo ukuthi bhaluleke umoya okanye ukuthi uziphumelele ukusuka. Ukugcina kuhlukeke kunye, phinde ubheke amasikhwama angaphansi kumoya wesintsi. Ngenxa yomculo, shetha ngazo amasikhwama amapholisa amandla yokuhlola ngokusebenzela, phakathi kwabantu ababuyiselene nabo babekho amandla yokuhlola ngokusebenzela, phakathi kwabantu ababuyiselene nabo.