1B73 EPA

1B73 EPA

HumiSeal® 1B73EPA conformal coating is: 

  • a fast drying, single component
  • acrylic conformal coating intended for use on printed circuit assemblies.

HumiSeal® 1B73EPA conformal coating has:

  • excellent flexibility,
  • fluoresces under UV light for ease of inspection and is easily repaired.
  • MIL-I-46058C qualification
  • IPC-CC-830
  • RoHS directive 2015/863/EU
  • EPA 33/50 compliant
  • UL File Number E105698.

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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” 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.

Depending on the complexity, density and configuration of components on the assembly, it may be necessary to reduce the viscosity of HumiSeal® 1B73EPA with HumiSeal® Thinner 600 in order to obtain a uniform film.  Once optimum viscosity is determined, a controlled rate of immersion and withdrawal (5-15 cm/min) will further ensure even deposition of the coating and ultimately a uniform film.  During the application, evaporation of solvent causes an increase in viscosity that should be adjusted by adding small amounts of HumiSeal® Thinner 600.

HumiSeal® 1B73EPA can be sprayed using conventional spraying equipment.  Spraying should be done in an environment with adequate ventilation so that the vapour and mist are carried away from the operator.  The addition of HumiSeal® Thinner 600 is necessary to ensure a uniform spray pattern resulting in pinhole-free film.  The amount of thinner and spray pressure will depend on the specific type of spray equipment used and operator technique. The recommended ratio of HumiSeal® 1B73EPA to HumiSeal® Thinner 600 is 1:1 by volume; however, the ratio may need to be adjusted to obtain a uniform coating.

HumiSeal® 1B73EPA may be brushed with a small addition of HumiSeal® Thinner 600. Uniformity of the film depends on component density and operator’s technique.

Product Specification
Density, per ASTM D1475 0.96 ± .03 g/cm3
Solids Content, % by weight per Fed-Std-141, Meth. 4044 23 ± 3 %
Viscosity, per Fed-Std-141, Meth. 4287 230 ± 30 centipoise
VOC 739 grams/litre
Drying Time to Handle per Fed-Std-141, Meth. 4061 30 minutes
Recommended Coating Thickness 25 – 75 microns
Recommended Curing Conditions 24 hrs @ RT or 60 min. @ 76°C
Time Required to Reach Optimum Properties 7 days
Recommended Thinner HumiSeal® Thinner 600
Recommended Stripper HumiSeal® Stripper 1080, 1080A
Shelf Life at Room Temperature, DOM 24 months
Thermal Shock, 50 cycles per MIL-I-46058C -65°C to 125°C
Coefficient of Thermal Expansion – TMA 67 ppm /°C
Glass Transition Temperature – DSC 42°C
Modulus – DMA 11.1 MPa
Flammability, per UL 94 V-0
Dielectric Withstand Voltage, per MIL-I-46058C >1500 volts
Dielectric Breakdown Voltage, per ASTM D149 6300 volts
Dielectric Constant, at 1MHz and 25°C, per ASTM D150-98 2.6
Dissipation Factor, at 1MHz and 25°C, per ASTM D150-98 0.01
Insulation Resistance, per MIL-I-46058C 5.5 x 1014 ohms (550TΩ)
Moisture Insulation Resistance, per MIL-I-46058C 7.0 x 1010 ohms (70GΩ)
Fungus Resistance, per ASTM G21 Passes
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