Viscosity and Polymerization Degree Guide for PVC Resin
Viscosity and Polymerization Degree Guide for PVC Resin Choosing the right PVC resin starts with two numbers that most buyers overlook: viscosity and polymerization degree. Get them wrong, and you will fight your plasticizer absorption, struggle with gelation, or end up with finished parts that crack under stress. Get them right, and your production line runs smoothly from day one. This guide explains what viscosity and polymerization degree actually mean for suspension PVC resin, how they influence processing behavior, and how to match them to your application. It is written for procurement managers, compounders, and production engineers who need practical selection criteria — not textbook theory. Key Takeaways Polymerization degree (DP) determines molecular weight, which controls mechanical strength and processing difficulty. K-value and viscosity number are indirect measurements of the same molecular weight property. SG-5 resin, with a typical K-value of 66–68, covers roughl...