Eminyakeni yamuva nje, ukuthuthukiswa kwemboni ye-PVC kungene ibhalansi ebuthakathaka phakathi kokuhlinzekwa nokufunwa. Umjikelezo wemboni ye-PVC yaseChina ungahlukaniswa izigaba ezintathu. 1.2008-2013 Isikhathi sokukhula ngesivinini esiphezulu samandla okukhiqiza embonini. 2.2014-2016 umthamo wokukhiqiza ukuhoxiswa period2014-2016 ukukhiqiza umthamo ukuhoxiswa isikhathi 3.2017 kuya esikhathini samanje ukukhiqiza ibhalansi, ibhalansi ebuthaka phakathi supply kanye nesidingo.
