... dissolved in tributyl phosphate (TBP) and chloroform pvc internal external lubricant for pvc pipe DLR-60,DLR-74 1 Product ... lubricant used in rigid PVC, it is highly compatible all-round lubricant also suitable for other additives. It is applicable to ... increased.DLR-74 is external lubricant for PVC processing. It is suitable for processing rigid/soft PVC granules, transparent sheets, planks, shrink ...