... dissolved in tributyl phosphate (TBP) and chloroform pvc internal external lubricant for pvc pipe DLR-60,DLR-74 1 Product ... for other additives. It is applicable to many kinds of processing conditions. DRL-60 can promote plasticization of melt, improve impact ... increased.DLR-74 is external lubricant for PVC processing. It is suitable for processing rigid/soft PVC granules, transparent sheets, planks, ...