... is internal lubricant. 2.DL-74 is external lubricant. 3.suit for rigid pvc,transparent sheets,board,shrink ... profiles, sections,sheets and pipes. Dosage is about 0.3-1.2 PHR, under special cases the amount can ... gloss. Dosage is about 0.3-0.8 PHR (transparent) or 0.3-1.2(opaque), under special ... cases the amount can be increased. PVC Lubricant DL-60,DL-74