Ukususela ngo-2019 ukuya ku-2023, izinga lokukhula eliphakathi lomthamo wemveliso ye-PVC ngonyaka yayiyi-1.95%, kwaye amandla emveliso anyuke ukusuka kwi-25.08 yezigidi zeetoni ngo-2019 ukuya kwi-27.92 yezigidi zeetoni ngo-2023. Ngaphambi ko-2021, ukuxhomekeka kokungenisa impahla bekusoloko kumalunga ne-4%, ikakhulu ngenxa yexabiso eliphantsi lemithombo yangaphandle kunye nobunzima bokutshintsha ezinye iimveliso eziphezulu.

Kwiminyaka emithathu ka-2021-2023, amandla okuvelisa i-PVC anyukile, ngelixa ukungeniswa kwamanye amazwe nako kwanda ngokukhawuleza, kuba ezinye izixhobo zangaphandle zichaphazelekile ngamandla amakhulu, ukunikezelwa kwachaphazeleka, kwaye ixabiso lalingenalo ithuba lokukhuphisana elicacileyo, kwaye ukuxhomekeka kokungeniswa kwamanye amazwe kwehle kwaya ngaphantsi kwe-2%. Kwangaxeshanye, ukusukela ngo-2021, imakethi yokuthumela ngaphandle i-PVC yaseTshayina ikhule ngokukhawuleza, kwaye phantsi kwenzuzo yamaxabiso, ithandwe yiIndiya, uMzantsi-mpuma we-Asia kunye namanye amazwe, kwaye imeko yokuthumela ngaphandle i-PVC inempembelelo ekhulayo kwimarike yasekhaya. Amandla okukhula ngokukhawuleza kwezinto ze-ethylene abangela inxalenye enkulu, ngaloo ndlela kuqinisa ukhuphiswano phakathi kwe-calcium carbide kunye neemveliso zenkqubo ye-ethylene. Ngokwembono yokusasazwa kwemimandla kwamandla amatsha okuvelisa, amandla amatsha okuvelisa ngo-2023 agxile kakhulu eShandong naseMzantsi China.

Umthamo wemveliso wonyaka ka-2023 ngokwenkqubo yokwahlulahlula, ikakhulu ugxile kumashishini e-calcium carbide, ebalelwa kwi-75.13% yamandla emveliso yesizwe, kuba iTshayina lilizwe elinamalahle amaninzi kunye neoyile encinci, kwaye amalahle asasazwa kakhulu kummandla wasentshona-ntshona, umntla-ntshona uxhomekeke kumalahle atyebileyo, izixhobo ze-calcium carbide, kwaye amashishini ikakhulu zizibonelelo ezixhasayo ezidibeneyo, ngoko ke amandla emveliso ye-PVC kummandla wasentshona-ntshona makhulu kakhulu. Umntla China, uMntla China, uMzantsi China kwiminyaka yakutshanje, amandla amatsha ngokuyintloko ngamandla emveliso ye-ethylene, ngenxa yothutho olulula, ukungenisa izinto eziluhlaza kunye nokuthuthwa.

Ngokwembono yengingqi, ummandla wasentshona-ntshona usaphambili ngeetoni ezili-13.78 lezigidi zamandla okuvelisa. Ngokweenguqu zengingqi, uMzantsi China wongeze iitoni ezingama-800,000 ukongeza umsantsa wemfuno yengingqi, ngenxa yesi sizathu, ukudluliselwa kwezixhobo eMntla China kwisabelo semarike saseMzantsi China kunciphile, uMntla China wongeze kuphela iseti yeetoni ezingama-400,000 zezixhobo, kwaye eminye imimandla ayinamandla amatsha. Lilonke, ngo-2023, kuphela amandla okuvelisa aseMzantsi China, uMntla China kunye noMntla-ntshona China aya kwanda, ngakumbi eMzantsi China, apho ukwanda kwamandla okuvelisa kunempembelelo enkulu. Amandla amatsha ngo-2024 aya kuba seMpuma China ikakhulu.

Ukususela ngo-2019 ukuya ku-2023, amandla oshishino lwe-PVC eTshayina aqhubekile nokukhula, eqhutywa kukwanda kwemveliso minyaka le kwiminyaka yakutshanje, amandla okuvelisa i-PVC yasekhaya aqhubekile nokukhula, ukususela ngo-2019 ukuya ku-2023 iminyaka emihlanu yokwandiswa kwamandla eetoni ezizizigidi ezi-2.84.

Ngenxa yotshintsho kulwandiso lomthamo waseTshayina olusekwe kwindawo enye kunye neepateni zokubonelela neemfuno zaphesheya, ukuhanjiswa kweenqanawa kunye nezinye izinto kunye neempawu, ukungeniswa kwempahla eTshayina kuye kwehla ngokuqhubekayo, kwaye ukuxhomekeka kokungeniswa kwempahla kulindeleke ukuba kwehle kuye kwi-1.74% ngo-2023. Kwixesha elide, ngokunyuka kokunikezelwa kwempahla yasekhaya, ukulungiswa komgangatho wemveliso, umsantsa wokunikezelwa kwempahla yasekhaya kwixesha elizayo uya kuncipha kancinci kancinci.