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 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® UV40HV can be applied via standard selective coating equipment or by conventional hand spray 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® UV40HV may be applied by brush for rework or touch up only. Brush must be cleaned with solvent promptly after use.

Clean Up
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, mechanical abrasion and, where available, HumiSeal® Stripper 1100 are suitable options for rework of HumiSeal® UV40HV.

HumiSeal® UV40HV is photosensitive. The product should not be exposed to direct sunlight or full spectrum fluorescent lighting.  HumiSeal® UV40HV 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® UV40HV 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.


Product Specification

Product Specification
Density 1.05 – 1.15 g/cm3
Minimum Solids Content 95 %
Viscosity, per Fed-Std-141, Meth. 4287 3700 ± 1300 centipoise
Recommended UV Cure* See TDS for Details
Shelf Life at Room Temperature, DOM 12 months
Recommended Stripper ** HumiSeal® Stripper 1100
Thermal Shock, 50 cycles per MIL-I-46058C -65°C to 125°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

*Microwave UV cure ovens equipped with “H” style bulbs recommended
**Stripper 1100 is not available in the EU