... ,pipe,window,fitting etc Better surface brightness. PVC processing aidBrief IntroductionZB-530 series is foam adjustment agent ... of the finished product.When it is used as processing aid, it can enhance the melt strength, ... with ultra-high viscosityMain ApplicationTo be used in rigid PVC foamed board, pipe, window and fitting, window, ... P-533JLG ChemPA-930Down river products PVC processing aid;K-400