Highly reactive tin-free catalyst for one- and two-component polyurethane systems and RTV silicones

  • Characteristic Data

    Metal contentBi: 27.5 – 28.5 % MCI 64-69
    Non-volatile contentMin. 60 % ASTM D 1644 B
    ViscosityMax. 800 mPa·s ASTM D 2196
    Specific gravity1.24 – 1.31 ASTM D 1963


  • Features

    • Ecologically safe replacement for other polyurethane catalysts, especially for amines and tin-based products like DBTL
    • Accelerates the reaction between the polyol and isocyanate component of polyurethane foam systems
    • Ensures fast blocking stability
    • Earlier solvent resistance and sanding capability
    • Higher film hardness

  • Applications

    • Solvent-based pigmented one- and two-component polyurethane coatings
      • Automotive Refinish
      • General Industrial
      • Coil

  • Dosage

    The recommended addition rate of Borchi® Kat 320 in polyurethane coatings is according to our experience between 0.01 and 0.03 % product, calculated on solid binder. The exact amount depends on the used binder and should be determined by means of preliminary trials. The optimal addition rate of Borchi® Kat 320 in PU foams and RTV silicone resins is depending on the reactive components and should as well be determined by means of preliminary trials. Borchi® Kat 320 can be added either in the supply form or diluted (e.g. in butyl acetate) to the polyol component of the coating system. Borchi® Kat 320 should not be diluted below 10% of the supply form, since those solutions are only stable for a limited period of time.

  • Storage

    Protect from the effects of weathering and store at temperatures between 5 and 30 °C. Once opened, containers should be resealed immediately after each removal of the product.

  • Safety

    Please refer to our safety data sheet for information relating to product safety.

Registration :
  • Europe : EINECS
  • Switzerland : EINECS
  • USA : TSCA
  • Canada : DSL
  • Australia : AICS
  • New Zealand : NZIoC
  • China : IECSC
  • Japan : ENCS
  • Korea : ECL
  • Taiwan : NECI
  • Philippines : PICCS