UV3109-M – UV/moisture cure Conformal Coating

UV3109-M is a single-component, UV-curable, acrylated polyurethane conformal coating that possesses excellent chemical resistance, thermal shock resistance, and moisture resistance. The material is tack-free after exposure to UV light. A secondary moisture cure mechanism will cure unexposed areas of the coating at ambient conditions. This coating fluoresces a bright blue when exposed to UV light (365nm) for easy inspection of coating coverage.

Features and benefits

  • Secondary moisture cure
  • Solvent-free, Halogen-free, Low odor
  • Excellent moisture, heat and chemical resistance.
  • Excellent adhesion
  • Complies to the RoHS directive 2015/863/EU and 2011/65/EU.



Properties UV3109-M
Composition Acrylated Urethane
Appearance Translucent Liquid
Color Colorless / Fluorescent
Viscosity @ 25°C, cps 60 – 120
Specific Gravity 1.05
Recommended Coating Thickness (μm) 25 ~ 75


Properties UV3109-M
UV Curing
Lamp type Mercury lamp
Intensity, mW/cm² >50
Energy, mJ/cm² > 1500
Humidity Curing:
Full Cure Time @ 25ºC, hr 72


Properties UV3109-M
Durometer hardness, shore A 70~80
Tensile at break, MPa 1.6
Elongation at Break (%) 52
Modulus of Elasticity, MPa 732
Glass Transition Temp., (TMA) ºC 6
CTE* (<Tg), ppm/K 77
CTE* (>Tg), ppm/K 220
Water absorption, 24hr, 25ºC, % 0.32
Dielectric Withstand Voltage, V > 1500
Dielectric Constant @1MHz 3.04
Dissipation Factor @1MHz 0.012
Volume Resistivity, 1.8 x 1016
Surface Resistance, ohm 1.0 x 1016
Comparative Tracking Index (CTI) 600
Recommended Operating Temperature, ºC -40 ~ 130

Technical Documents

UV3109-M Technical Data Sheet

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