DESMODUR BL 3175A is a blocked aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) and dissolved in aromatic 100. It provides excellent light stability and weatherability. DESMODUR BL 3175A blocked polyisocyanate is used with hydroxyl-functional coreactants in the formulation of light-stable one-component systems with relatively low curing temperatures. Systems based on DESMODUR BL 3175A blocked polyisocyanate deliver high flexibility and hardness. It allows adjustment of cure rate without compromising storage stability. DESMODUR BL 3175A polyisocyanate ensures superior durability in exterior applications comparable to alternative solutions. It can also upgrade the flexibility and adhesion of conventional systems.