hdi low viscosity covesro xp2580   characterization : desmodur xp 2580 is an aliphatic polyisocyanate based on hexamethylene diisocyanate (hdi). it is suitable for use as the hardener component for lightfast, weather-stable coating systems. form supplied :form supplied is 100%. characteristic data: property value unit of measurement method nco content 19.5 ± 0.5 % % viscosity at 25°c 450...