Eminyakeni yamuva nje, intuthuko yemboni ye-PVC ifinyelele ebhalansini elibuthakathaka phakathi kokunikezwa kanye nesidingo. Umjikelezo wemboni ye-PVC yaseShayina ungahlukaniswa ngezigaba ezintathu. 1.2008-2013 Isikhathi sokukhula okusheshayo komthamo wokukhiqiza embonini. 2.2014-2016 isikhathi sokuhoxiswa kwamandla okukhiqiza2014-2016 isikhathi sokuhoxiswa kwamandla okukhiqiza3.2017 kuze kube manje isikhathi sokulinganisela ukukhiqiza, ibhalansi ebuthakathaka phakathi kokunikezwa kanye nesidingo.
