1.Ka taea te whakamahi hei whakarewa mo te tuhi hiraka o te muka waihanga, te tukatuka kirihou, te hanga o te waituhi casein rakau.
2. Kei te whakamahia ano hoki hei kaihoko maimoatanga mo te pepa, he kohu mo te keri hinu me te ahumahi hanga, te carburizing me te kaihoko nitriding mo te ahumahi whakarewa, te whakamahana mo te kapia kararehe me te whakarewa polar mo te whakahiato waro, me etahi atu.