NBR (nitrile -butadiene reberi) na PVC (Poly Vinyl Chloride) nicyo kintu nyamukuru kivanze mubikorwa bya plastiki-reberi.Imvange ya NBR / PVC ifite imiterere ya PVC irwanya ozone hamwe na NBR iranga amavuta usibye imikorere yayo yo guhuza, hiyongereyeho umuriro muke.Irakora kandi hamwe nibintu byiza bifatika.Bitewe ninkomoko kandi ihendutse PVC nkibikoresho fatizo, ifuro rivanze rikoreshwa cyane mubice byinshi.