HumiSeal® 1B78 conformal coating is:

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

HumiSeal® 1B78 conformal coating has:

  • Excellent application properties with improved de-foaming properties compared to tradition acrylic coatings.
  • Improved adhesion to substrates, especially modern ‘no clean’ manufacturing technologies
  • HumiSeal® 1B78, demonstrated excellent flexibility and electrical properties, fluoresce under UV light for ease of inspection and are easily repairable.
  • HumiSeal® 1B78 has IPC-CC-830
  • RoHS directive 2015/863/EU

Properties of HumiSeal® 1B78

Density, per ASTM D1475 0.93 ± 0.02 g/cm³
Solids Content, % by weight per Fed-Std-141, Meth. 4044 27.5 ± 2 %
Viscosity, per Fed-Std-141, Meth. 4287 250 ± 20 centipoise
VOC 674 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 2 hrs @ 76°C
Time Required to Reach Optimum Properties 7 days
Recommended Thinner HumiSeal® Thinner 73/600
Recommended Stripper HumiSeal® Stripper 1080
Surface Insulation Resistance IPC TM 650 9.39 LogOhms
Adhesion to no clean PCBs Excellent

Application of HumiSeal® 1B78

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® 1B78 and Pre-Blends should be stored away from excessive heat or cold, in tightly closed containers. HumiSeal® products may be stored at temperatures of 0 to 35°C. Prior to use, allow the product to equilibrate for 24 hours at a room temperature of 18 to 32°C.


Application of HumiSeal® Conformal Coatings should be carried out in accordance with local and National Health and Safety regulations.

The solvents in HumiSeal® Conformal Coatings are flammable. Material should not be used in presence of open flame or sparks. Use only in well-ventilated areas to avoid inhalation of vapours or spray. Avoid contact with skin and eyes. Consult MSDS/SDS prior to use.

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