UV40 Solar

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 2011/65/EU.

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Conformal coatings can be successfully applied to substrates that have been cleaned prior to coating and also to substrates assembled with low residue, “no clean” assembly materials. Users should perform adequate testing to confirm compatibility between the conformal coating and their particular assembly materials, process conditions and cleanliness level. Please contact HumiSeal® for additional information.

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 vapor and mist are carried away from the operator.

HumiSeal® UV40-SOLAR may be applied by brush for rework or touch up only. Brush must be cleaned with solvent promptly after use.

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.

Product Specification

Product Specification
Density 1.06 g/cm3
Minimum Solids Content 95 %
Viscosity, per Fed-Std-141, Meth. 4287 650 ± 150 centipoise
Recommended Coating Thickness 25-125 microns
Recommended UV Cure* See TDS for Details
Shelf Life at Room Temperature, DOM 12 months
Thermal Shock, 50 cycles per MIL-I-46058C -65ºC to 125ºC
Glass Transition Temperature – DSC 45ºC
Coefficient of Thermal Expansion – TMA 85 ppm/ºC Below Tg
197 ppm/ºC Above Tg
Modulus – DMA 10364 MPa @ -40°C
4283 MPa @ 25°C
66 MPa @ 80°C
Dielectric Withstand Voltage, per MIL-I-46058C >1500 votls
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