I-NBR (irabha ye-nitrile -butadiene) ne-PVC (i-Poly Vinyl Chloride) iyingxube eyinhloko embonini yegwebu lerabha yepulasitiki.Ingxube ye-NBR/PVC inakho kokubili isici se-PVC sokumelana ne-ozone kanye nesici sokumelana nowoyela kwe-NBR ngaphandle kokusebenza kwayo kokuphambana, kanye nokumelana nomlilo kancane.Isebenza futhi nempahla engokomzimba enhle.Ngenxa ye-PVC etholakalayo futhi engabizi njengempahla eluhlaza, igwebu elinjalo elihlanganisiwe lisetshenziswa kabanzi emikhakheni eminingi.