Non-Isocyante PolyUrethane(HNIPU or NIPU) projects Public info on DOD's Environmental Research Programs. Closely in touch with the EPA I'm sure.. What product does the EPA endorse? you got it...HCT Green Poly. 1) Non-Isocyanate Polymer Design and Coating Development - https://www.serdp-estcp.org/Program-Areas/Weapons-Systems-and-Platforms/Surface-Engineering-and-Structural-Materials/Coatings/WP-2315/WP-2315/(language)/eng-US 2)Replacement of Isocyanate Chemistry for Polyurethane-Like Topcoats - https://www.serdp-estcp.org/Program-Areas/Weapons-Systems-and-Platforms/Surface-Engineering-and-Structural-Materials/Coatings/WP-2314/WP-2314/(language)/eng-US 3)Isocyanate-Free Solid Rocket Motor Propellant Binders Inspired by Nature - https://www.serdp-estcp.org/Program-Areas/Weapons-Systems-and-Platforms/Energetic-Materials-and-Munitions/Rocket-and-Missile-Propellants/WP-2406/WP-2406/(language)/eng-US 4) Non-Isocyanate Polyurethane Platform for Sustainable and Advanced Rain Erosion Resistant Coatings - https://www.serdp-estcp.org/Program-Areas/Weapons-Systems-and-Platforms/Surface-Engineering-and-Structural-Materials/Coatings/WP-2602/WP-2602/(language)/eng-US Note #4 - Principal Investigator Dr. Vijay Mannari Eastern Michigan University Oleg Figovsky just gave a lecture at EMU in December 2015 https://www.emich.edu/univcomm/emutoday/index.php?id=1417_lecturesMeetings 5) Hybrid Ultra-Low VOC and Non-HAP Rain Erosion Coatings - https://www.serdp-estcp.org/Program-Areas/Weapons-Systems-and-Platforms/Surface-Engineering-and-Structural-Materials/Coatings/WP-2603/WP-2603/(language)/eng-US 6) Sustainable, Environmentally Green Polyurethanes for Erosion-Resistant Coatings - https://www.serdp-estcp.org/Program-Areas/Weapons-Systems-and-Platforms/Surface-Engineering-and-Structural-Materials/Coatings/WP-2601/WP-2601/(language)/eng-US there are probably several others listed on the site. Delve in fellow DD peeps