HumiSeal® UV40HV is a single component, high solids, UV curable, acrylated polyurethane conformal coating that has been formulated specifically for dispensing and jetting applications. The material 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 of the coating within 2-3 days at ambient conditions. The coating fluoresces under UV light to allow coating inspection. HumiSeal® UV40HV is in full compliance with the RoHS Directive 2002/95/EC.
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® UV40HV can be applied via standard selective coating equipment with either jet spray or needle valves. The source air used for spraying must be dry (a dry inert gas is highly recommended) to prevent premature curing of UV40HV’s effective secondary cure mechanism. The dispensing should be done with adequate ventilation so that the vapour and mist are carried away from the operator.
To flush equipment and clean uncured HumiSeal® UV40HV, non-alcohol based solvents should be used. HumiSeal® Thinner 600 is recommended.
HumiSeal® UV40HV 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® UV40HV.
|Minimum Solids Content||95 %|
|Viscosity, per Fed-Std-141, Meth. 4287||3000 centipoise|
|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 25°C|
|Glass Transition Temperature - DSC||45°C|
|Coefficient of Thermal Expansion - TMA||85 ppm/°C Below Tg
197 ppm/°C Above Tg
|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
All values contained herein are typical values.
Please consult the Technical Data Sheet for the specific product to obtain complete information and detailed specification ranges and physical properties
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