E whakamahia ana ngā tango pūmau i roto i te tānga flexo, tae atu ki te momo whakapūmau, te momo tukunga korona ngaohiko teitei me te momo isotope irahiko. He rite tonu tā rātou kaupapa mō te whakakore i te hiko pūmau. Ka whakakōkīhia e rātou katoa ngā momo ngota i roto i te hau hei katote. Ka huri te hau hei paparanga katote me te kaiārahi hiko. Ka whakakorea tetahi wāhanga o te utu pūmau kua utua, ā, ka arahina atu tetahi wāhanga e ngā katote hau.

Mīhini tā flexo Mō te tānga kiriata kirihou, ka whakamahia ngā matū ārai-pūmau hei whakakore i te hiko pūmau. Ko ngā matū ārai-pūmau ko ētahi matū whakaora-pūmau, kei roto i ngā ngota ngā rōpū hydrophilic polar me ngā rōpū lipophilic kore-polar. He hototahi ngā rōpū lipophilic ki ngā kirihou, ā, ka taea e ngā rōpū hydrophilic te whakakoi, te mimiti rānei i te wai i te rangi. Ka hangaia he paparanga kawe angiangi ka taea te turuturu i ngā utu, ā, ka whai wāhi hoki ki te ārai-pūmau.