K-FLEX UD-350W is an aqueous solution of an aliphatic, low molecular weight urethane diol oligomer. It is recommended as a modifier for amino crosslinked water soluble and emulsified acrylic, alkyd, urethane and polyester resins. K-FLEX UD-350W can be used as a reactive cosolvent replacement to increase solids, crosslink density, improve film/resistance properties and flow/leveling.
Viscosity @ 25°C 4,000 cPs
% Active 88
Hydroxyl Number 300
Application Advantage Hardness
Application Advantage Anti-popping
Application Advantage Chemical resistance
Application Advantage Stain resistance
Application Advantage Flow and leveling
Application Advantage High gloss
Application Advantage QUV resistance
Application Advantage Exterior durability
Formulation Advantage Allows cosolvent reduction
Formulation Advantage Water soluble
Formulation Advantage Hydrolytic stability
Market Application Coil
Market Application Overprint varnishes
Market Application Appliance
Market Application Auto OEM
Market Application Wood
Market Application Can
Market Application Dip coatings
Product Group Urethane diol

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  • Viscosity @ 25°C 7,000 cPs
  • Hydroxyl Number 300
  • % Active 82
  • Urethane diol Incorporation of urethane into HMMM type systems without use of NCO. Increases application solids and hardness. Improves chemical resistance, exterior durability and hydrolytic stability.

  • Viscosity @ 50°C 7,000 cPs
  • Hydroxyl Number 350
  • % Active 100
  • Urethane diol Recommended for prepolymer synthesis and 100% solids WB/SB melamine crosslinked systems or 2K PU. Used for preparation of polyester polyurethanes or alkyd polyurethanes. Provides hardness and exterior durability

  • % Active 100
  • Viscosity @ 25°C 850 cPs
  • Application Advantage Pot life
  • Urethane diol Consists of only 1° OH. Good compatibility in high mW ethers, esters and aromatic isocyanates. Recommended as a chain extender and curative for aliphatic prepolymers. A 1,4-Butanediol alternative with longer pot-life and lower exotherm for reduced suck-back and shrinkage.