news Tris(dimethylaminopropyl)hexahydrotriazine FDA 21 CFR 177.1680 Certification in Food Grade Polyurethane Conveyors Tri(dimethylaminopropyl)hexahydrotriazine: Safety guard in food grade polyurethane conveyor belts In... 03/1977Tris(dimethylaminopropyl)hexahydrotriazine FDA 21 CFR 177.1680 Certification in Food Grade Polyurethane Conveyors