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HumiSeal UV40-SOLAR UV Curable Conformal Coating

HumiSeal® UV40-SOLAR is a single component, low viscosity, high solids conformal coating material that has been formulated for use under prolonged exposure to sunlight, without discoloration or degradation. It meets the requirements of SAE-J-1960 standard (QUV accelerated age testing). In addition, the coating possesses excellent chemical resistance, surface hardness, flexibility, moisture resistance and is tack-free after exposure to UV light. A secondary moisture cure mechanism will cure unexposed areas within 2-3 days at ambient conditions. HumiSeal® UV40-SOLAR is in full compliance with the RoHS Directive 2002/95/EC.
Manufacturer: Humiseal

Properties of HumiSeal® UV40-SOLAR

Density 1.06 g/cm3
Minimum Solids Content 95 %
Maximum Viscosity, per Fed-Std-141, Meth. 4287 650 ± 150 centipoise Recommended Coating Thickness 25 - 125 microns Recommended UV Dose* 1 - 4 J/cm2
Shelf Life at Room Temperature, DOM 12 months Thermal Shock, 50 cycles per MIL-I-46058C -65°C to 125°C Glass Transition Temperature - DSC 45ºC
Coefficient of Thermal Expansion - TMA 85 ppm/°C below Tg
197 ppm/°C above Tg
Modulus - DMA 10364 MPa @ -40°C
4283 MPa @ 25°C
66 MPa @ 80°C Dielectric Withstand Voltage, per MIL-I-46058C >1500 volts Dielectric Constant, at 1MHz and 25°C per ASTM D150-98 2.5
Dissipation Factor, at 1MHz and 25°C per ASTM D150-98 0.01
Insulation Resistance, per MIL-I-46058C 8.0 x 1014 ohms (800TΩ) Moisture Insulation Resistance, per MIL-I-46058C 4.7 x 1010 ohms (47GΩ) Fungus Resistance, per ASTM G21 Pass

*Fusion “H” style bulb recommended

Application of HumiSeal® UV40-SOLAR

Cleanliness of the substrate is of extreme importance for the successful application of a conformal coating. Surfaces must be free of moisture, dirt, wax, grease, flux residues and all other contaminants. Contamination under the coating could cause problems that may lead to assembly failures.


HumiSeal® UV40-SOLAR should be applied by standard selective coating equipment. The source air used for spraying must be dry (a dry inert gas is highly recommended) to prevent premature curing of the secondary cure mechanism. The spraying should be done with adequate ventilation so that the vapour and mist are carried away from the operator.

Clean Up

To flush equipment and clean uncured HumiSeal® UV40-SOLAR, non-alcohol based solvents should be used. HumiSeal® Thinner 600 is recommended.


HumiSeal® UV40-SOLAR is a highly cross linked UV cured coating. The cured film has a high degree of environmental and chemical resistance and will be more difficult to remove than traditional conformal coatings.
Thermal displacement and mechanical abrasion are suitable options for rework of HumiSeal® UV40-SOLAR.


HumiSeal® UV40-SOLAR is photosensitive. The product should not be exposed to direct sunlight or full spectrum fluorescent lighting. HumiSeal® UV40-SOLAR should be stored away from excessive heat, in tightly closed opaque containers at 0 to 25°C to ensure maximum shelf life is achieved. Prior to use, allow the product to equilibrate for 24 hours at room temperature. HumiSeal® UV40-SOLAR is a moisture curing material and care should be taken to protect process vessels and partial containers from moisture. Partial containers must be purged with a dry, inert gas such as dry air, nitrogen or argon before closure, otherwise premature polymerization by atmospheric moisture will occur.


Application of HumiSeal® Conformal Coatings should be carried out in accordance with local and National Health and Safety regulations.
Use only in well-ventilated areas to avoid inhalation of vapours or spray. Avoid contact with skin and eyes. Consult MSDS/SDS prior to use.



Conro Electronics Ltd
Unit 7, Orbital 25, Dwight Road, Watford, Hertfordshire
WD18 9DA

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