K-Flex 188 Polyester polyol King Industries Polyurethane (PU) - Polyols >> Polyester Coatings >> Waterborne Plastic coating K-Flex polyester polyols (Table 1) are used primarily as modifiers for acrylic, alkyd, epoxy and polyester formulations. They have unique structures with a narrow molecular weight distribution designed for high reactivity and fast cure with melamine and isocyanate crosslinkers. Containing primary hydroxyl groups, K-Flex polyester polyols are typically used at 5-15% modification levels on standard resins to: Increase film flexibility Improve resistance properties Reduce VOC's, increase solids Achieve higher crosslink density, improve cure response A K-Flex/Melamine ratio of 60/40 is recommended for modifying typical resin systems. K-Flex 188 can be used as an effective modifier for water reducible coatings. The addition of a suitable co-solvent is used for solubility and stability. K-Flex 188 100% Active Polyester Polyol Improves flexibility, salt spray and humidity resistance while maintaining hardness. Highest reactivity. Excellent adhesion to many substrates including plastics. Highly recommended for 2K urethane applications. 100% active polyester polyol containing primary hydroxyl groups. Used as a modifier for acrylic, alkyd, epoxy and polyester formulations. Offers narrow molecular weight distribution, high reactivity and fast cure with melamine and isocyanate crosslinkers. Improves flexibility, salt spray and humidity resistance. Maintains hardness. Gives very good adhesion to many substrates including plastics. Highly recommended for 2K urethane applications. Can be used as an effective modifier for water reducible coatings in combination with a suitable co-solvent for solubility and stability. <br> Use level: 5-15% on standard resin.