POLYURETHANE Conformal Coating

Conformal Coating

Polyurethane Conformal Coatings

Polyurethane conformal coatings come as single-component, two-component, UV-curable, and water-borne systems. Although polyurethanes provide good chemical and moisture resistance, they are often hard to rework and have low tolerance in humid environments. 


  • Good Dielectric Properties
  • Good Moisture Resistance
  • Solvent Resistance
  • Less Reversion Potential
  • Abrasion Resistance


Weaknesses of Cure Type

Solvent Evaporation

  • Moisture affects cure rate and desired properties
  • Long complete cure time (up to 30 days)
  • Health and safety concerns
  • Potential for high stress during temperature cycling conditions
  • High probability of reversion under temperature and humidity stress conditions

Heat Cure

  • Cure is dependent on thickness
  • Component mass affects time and temperature of cure process
  • High VOC potential
  • Reacts violently with presence of water
  • Should be used with caution for low temperature components

UV Cure

  • One component coatings require accurate application material to avoid shadowed areas
  • Two part systems require meter mix equipment
  • Some coatings are more difficult to rework
  • UV intensity and wavelength effects cure
  • Some secondary cure mechanisms require heat exposure
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