A Simple Guide to Granular Polymer Pre-Coated Materials Granular Polymer Pre-Coated (GPPK) is a versatile material used in many industries due to its strength, durability, and performance. It is often used in construction, environmental protection, and agriculture. This article will explore the different kinds of GPPK and their uses. What is Green green-pilled pistachio kernel? Granular Polymer Pre-Coated (GPPK) is made by coating granules or particles with a polymer layer....