One-pack pvc stabilizers are the combination of individual lead singles stabilizers, lubricants (internalExternal) and other additives so as to give balanced type of one package system optimum in stability action and their rheologicol effectiveness. There are various advantages of one pack system.They reduce weightmeter of pipe compared to individual singles due to their less sp.gravity. Also lesser quantity of one packs will give better results than addition of individual stabilizer.