K-FLEX UD-320 is a high solids, aliphatic, low molecular weight urethane diol oligomer. It is soluble in polar organic solvents and has broad compatibility with acrylic, polyester, and alkyd resins. K-FLEX UD-320 will increase the hardness of a melamine crosslinked system. When used to modify a 2-component polyurethane, it will increase hardness and flexibility. K-FLEX UD-320 responds best to a zirconium chelate catalyst when used in isocyanate crosslinked systems.
Good Chemical Resistance
Good Exterior Durability
Excellent Hydrolytic Stability
Good QUV Resistance
Urethane Functionality without Isocyanates
Appearance: Clear, straw viscous liquid
% Active: 82
Viscosity, cPs, 50°C: 7,000
Hydroxyl number: 300
Hydroxl equiv. weight: 188
Weight per gallon, 25°C: 9.4 lbs.
Volatile: PM acetate
Soluble in most organic solvents with the exception of aromatic and aliphatic hydrocarbons. Aromatic solubility can be achieved in combination with a hydrogen bonding solvent.
Machinery and Equipment Coatings
TYPICAL USAGE LEVELS:
Typically 5 -15% on total resin solids (TRS) for melamine baking systems or 5 - 10% on TRS for 2-component urethanes.