K-Flex XM-A307 Polyester polyol King Industries Polyurethane (PU) - Polyols >> Polyester 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 XM-A307 100% Active Polyester Polyol Improves flexibility, salt spray resistance properties and makes possible lower VOC. A low OH# results in a lower crosslinker demand. Good flow/leveling. 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 and salt spray resistance properties. Allows low VOC. Offers low hydroxyl number, low crosslinker demand and good flow/leveling. Highly recommended for 2K urethane applications. <br> Use level: 5-15% on standard resin.