Eco-Friendly Modified Polymer for Industrial Bonding and Sealing HF D35 is a medium to high modulus hybrid polymer developed for industrial bonding and sealing applications that require a balance of adhesion strength, flexibility, and long-term durability. Manufactured by Risun, this moisture-curing polymer is designed to help adhesive and sealant manufacturers formulate products suitable for equipment assembly, industrial fabrication, transportation systems, and general