Ngomhla zi-2 kuNovemba, iHhovisi Elijwayelekile Lomnyango Wezemvelo Nezemvelo lakhipha “Isaziso Ngokuphrinta Nokusabalalisa “Uhlu Oluphelele Lokuvikelwa Kwemvelo (Ushicilelo luka-2021)” (Incwadi Ebanzi Yehhovisi Lezemvelo [2021] No. 495).“Ohlwini Oluphelele Lokuvikelwa Kwemvelo (Ushicilelo luka-2021)”, amalahle/i-coke/i-pitch eluhlaza okwesibhakabhaka (ngaphandle kokukhishwa kwetiyela kusetshenziswa i-atmospheric, vacuum noma i-atmospheric kanye nezinqubo zokucwenga eziqhubekayo ze-vacuum) ekuphekeni (ikhodi yemboni engu-2520) kunsimbi yendabuko nensimbi. imboni, insimbi Igoqiwe (ikhodi yomkhakha 3130) ishidi lensimbi elicwecwe nge-chromium (ngaphandle kwenqubo e-trivalent chromium electroplating)/ipuleti elihlanganiswe ngombala (ngaphandle kwenqubo yokuhlanganisa imibala engena-chromium) imikhiqizo, ukuncibilika kwe-ferroalloy (ikhodi yomkhakha 3150) manganese yensimbi/i-silicon yensimbi/ imikhiqizo ye-metal chromium , Uchungechunge lwemikhiqizo ekhiqizwa inqubo ye-hot-dip galvanizing ngensimbi (ikhodi yemboni 3208) yimikhiqizo "engcolisa kakhulu";ukwenziwa kwensimbi (ikhodi yomkhakha 3210) kanye nokwenza insimbi (ikhodi yemboni 3220) ayihlukaniswa ngokuthi "ingcolisa kakhulu" kanye "nobungozi obukhulu bemvelo" "umkhiqizo.