Based on diffrent K value of PVC resin, PVC resin mainly have follows type:
1. K70-75 are high K value resins which gives best mechanical properties but are
more difficult to process. They need more plasticizer for same softness. High performance Cable insulations in Suspension resin and tough coatings
for Conveyor belts, Industrial Flooring and similar high end applications in
Paste grade are some popular application. It is the costliest.
2. K65-68 are medium K value resin which are the most popular. They have a good balance of Mechanical properties and processibility. UPVC (Unplasticised or Rigid PVC) is made from the less porous grades while Plasticised Applications
are best made from the more porous grades. There is a lot of grade choice as
they cater to the Majority of PVC applications. Because of its sheer volume
this family of PVC resins are priced the lowest.
3. K58-60 are low Kvalue ranges. Mechanical properties are lowest, but processing is easiest. Many difficult to process applications like injection moulding,blow moulding and Clear Calendered packaging film are made from the lower K value ranges. Prices are higher than Medium K Value Resins.
4. K50-55 are special resins which are tailor made for some demanding applications. Interesting ones are Battery Separator Resins and Blending resins used along withPaste Grade resin to reduce costs. Processing is easiest.