HumiSeal® UV40 is a single component, high solids, UV curable, acrylated polyurethane conformal coating that possesses excellent chemical resistance, surface hardness, flexibility and moisture resistance. The material 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 for coating inspection and can be applied by selective coating equipment. HumiSeal® UV40 coating is recognized under UL File Number E105698, and is MIL-I-46058C qualified, and IPC-CC-830 and RoHS Directive 2011/65/EU compliant.
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 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® UV40 may be applied by brush for rework or touch up only. Brush must be cleaned with solvent promptly after use.
To flush equipment and clean uncured HumiSeal® UV40, non-alcohol based solvents should be used. HumiSeal® Thinner 521 or Thinner 521EU is recommended.
HumiSeal® UV40 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® UV40.
|Density||1.10 ± 0.05 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*||SeeTDS 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
|Modulus – DMA||10360 MPa @ -40ºC
4280 MPa @ 25ºC
66 MPa @ 80ºC
|Flammability, per UL-94||V-0|
|Dielectric Withstand Voltage, per MIL-I-46058C||>1500 volts|
|Dielectric Constant, at 1MHz and 25°C per ASTM D150-98||2.5|
|Dielectric Constant, at 10MHz and 22°C per ASTM D2520||3.21|
|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|
|Resistance to Chemicals||Excellent|
**Stripper 1100 is not available in the EU