PVC resin SG5 is one of the go-to types of PVC resin thanks to its well-rounded properties that make it incredibly versatile. This grade falls under the suspension-type PVC category and has a mid-range K-value (around 68–66), which strikes a good balance between being tough and flexible. That’s why you’ll find it being used in all sorts of products, from pipes and fittings to window frames and sheets.