Matching PVC Resin Grade to Your Product Application
Matching PVC Resin Grade to Your Product Application Introduction Choosing the wrong PVC resin grade is one of the most expensive mistakes a manufacturer can make. You might end up with rigid pipes that crack under pressure, or flexible films that exude plasticizer and fail safety tests. The problem is that PVC suspension resin grades look similar on paper — same white powder, similar particle size — yet they behave completely differently in the extruder, the injection molding machine, or the calendering line. Traditional selection advice often stops at "use SG-5 for pipes, SG-3 for soft products." That oversimplification ignores the real variables: polymerization degree, K-value, plasticizer uptake, fish-eye count, and residual VCM content. Each of these properties shifts the processing window and the final product's mechanical performance. This guide walks you through a step-by-step method for matching PVC resin grade to your product application. It covers the key ...