4''x4'' FEP Sheets are specifically designed for concentrate storage. Each FEP sheet is terpene resistant and pre-cut to 4''x4'' inch squares for convenience and easy access. It is non-stick that display your product with pride with these see-through and making it ideal for managing wax and oil. Terpenes, the same chemical compounds which give plants and their extracts smell are also highly reactive solvents. Some terpenes like D-Limonene are used as industrial cleaning solvent and even silicone remover! As more extract producers turn to making terpene rich extracts, FEP Sheets are solvent proof. Now the next evolution is around the corner! Green Canamaster are an advanced fluoropolymer FEP commonly used in the medical industry. FEP is made out of PTFE and another fluorinated polymer giving it excellent chemical resistance. FEP is softer and easier to fold than PTFE making it perfect for large scale packaging. Green Canamaster are UV resistant and optically clear allowing a perfect view of what is inside. All FEP Sheet packaging is always made from the highest quality Fluoroelastomers and meet FDA guidelines for food contact surfaces. Green Canamaster packaging is safe and 100% contamination free.