DL-75 Polyisocyanate Curing Agent/ PU Hardener

Aromatic polyisocyanate PU hardener based on TDI adduct. It can be used as the hardener component for two-component polyurethane coatings and adhesives. DL75 exhibits comparable performance with Desmodur L75.


  • Low free TDI
  • Light color & Transparent
  • Excellent chemical resistance
  • Excellent solubility
  • High gloss & Good leveling

DL-75 PU hardener is a versatile curing agent renowned for its exceptional characteristics. With good leveling, transparency, excellent solubility and chemical resistance, it is widely used as PU hardener to formulate coatings for high gloss wood furniture paint, parquet flooring, metal, plastics and more. It also finds applications as isocyanate crosslinkers for polyurethane adhesives to create a strong bond with excellent adhesion that can provide resistance to chemical, heat and other solvents.

  • Specifications

  • Solubility

  • Compatibility

  • Storage

  • Packaging

DL-75 PU hardener

Type TDI adduct
Appearance Colorless to pale yellow transparent viscous liquid
Color  (Fe-Co) ≤1
Solid Content% 75±2
NCO Content% 13.0±0.5
Free Monomer% TDI≤0.5
Viscosity (cps) 1500±500
Solubility ≥3.0

DL-75 PU hardener is compatible with esters, ketones, and ether ester solvents. It has limited solubility in aromatic hydrocarbons and is not compatible with aliphatics hydrocarbons. Prior to usage, it is recommended to conduct stability tests in the chosen solvent and assess its impact on the coating film.

Solvents containing reactive groups (e.g. water. alcohols, amines) should not be used since they react with the PU hardener. It is recommended to use “urethane grade” solvent for the dilution (with water content below 500 ppm) , and ≥25% solid content after diluted is recommended.

DL-75 PU hardener is compatible with all types of polyesters, polyethers and polyacrylates. Prior to usage, it is recommended to conduct performance test to achieve precise formulations. When blending with curing agents from other manufacturers, it is advisable to conduct performance tests on the mixture to ensure desired outcomes.

DL-75 PU hardener must be stored in a tightly sealed container to prevent exposure to moisture and air. The products should be placed in a cool, dry indoor environment at  temperature (0-30°C), protected from direct sunlight and other chemical materials.

Net weight: 225KG/drum or customized

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