• Coatings

Desmodur® BL 3370 MPA

Blocked aliphatic HDI-polyisocyanate. To formulate lightfast one-component stoving polyurethane coatings with high themal yellowing resistance; as an additive to improve flexibility and adhesion.

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Product Types

  • PIC
  • Crosslinkers
  • Hardeners
  • Aliphatic polyisocyanate
  • Isocyanate
  • Polyisocyanurate
  • Polyisocyanate


Elastic, Thermally resistant, Solventborne, Flexible

General Characterization

Desmodur BL 3370 MPA is a blocked aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
It is suitable for use in combination with Desmophen® grades to formulate lightfast, one-component stoving polyurethane coatings with high resistance to thermal yellowing; as an additive in conventional stoving coating systems to improve the reactivity, flexibility and adhesion.

Storage Conditions

Desmodur BL 3370 MPA should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. Storage at higher temperatures will result in increase of color and viscosity. Storage at significant lower temperatures will result in solidification. This solidification is reversible by briefly heating the product without adversely affecting the quality of the product. Recommended storage temperature is 0º-30ºC.


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Packaging Type

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Technical Properties & Datasheets

Property Name Test Method Unit Value
Hazen color value ≤ 60
Viscosity at 23°C mPa∙s 3,800 ± 1,200
Free NCO content % ≤ 0.2
Non-volatile content (1 g / 60 min / 80^oC) % 70 ± 3

Property Name Test Method Unit Value
Density g/cm^3 approx. 1.08
Viscosity at 25^oC mPa∙s approx. 3,200
Blocked NCO content % approx. 8.9
Equivalent weight approx. 470
Flash point °C approx. 49
Equivalent weight approx. 470


Technical Data Sheet
Safety Data Sheet
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