PUC Polyurethane Coating

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PUC is a clear amber modified Polyurethane Conformal Coating, specifically designed for the protection of electronic circuitry. PUC is tough and has excellent mechanical and dielectric properties while maintaining flexibility to protect delicate components.

PUC can be sprayed, dipped or brushed. The thickness of the coating depends on the method of application (typically 25-75 microns). Temperatures of less than 16°C or relative humidity in excess of 75% are unsuitable for the application of PUC. As is the case for all solvent based conformal coatings, adequate extraction should be used (refer to MSDS for further information) For full product details including test results please refer to the TDS below. If you still require further information please don’t hesitate to get in touch.


Approvals RoHS Compliant (2015/863/EU): Yes
MIL Approval (MIL-1-46058C): Meets approval
IPC-CC-830: Meets approval
DEF-STAN 59/47: Meets approval
Liquid Properties Appearance: Clear amber liquid
Density @ 20°C (g/ml): 0.90 (Bulk), 0.870 (Aerosol)
VOC Content: 63% (Bulk) 66% (Aerosol)
Flash Point: 38°C (Bulk), -4°C (Aerosol)
Solids content: 37% (Bulk), 34% (Aerosol)
Viscosity @ 20°C (mPa s): 150 – 240
Touch Dry: 40 – 45 minutes
Recommended Drying Time: 24 hours @ 20°C
180 minutes @ 65°C
90 minutes @ 80°C
Coverage @ 25µm: 14m
2 per litre (Bulk), 5m2
(400ml Aerosol)
Dry Film Coating Colour: Clear amber
Operating Temperature Range: -55°C to +130°C
Flammability: Meets UL94-V0
Thermal Cycling (MIL-1-46058C): Meets approval
Coefficient of Expansion: 100ppm
Dielectric Strength: 60 kV/mm
Dielectric Constant: 3.6
Surface Insulation Resistance: 1 x 1015 Ω
Dissipation Factor @ 1MHz, 25°C: 0.01
Moisture Resistance (MIL-1-46058C): Meets approval

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