Urethanes Conformal coating 1A27
Model No: 1A27

HumiSeal® 1A27 is a single component, polyurethane conformal coating, suitable for general printed circuit board applications. HumiSeal® 1A27 contains no free isocyanates.

 Product Enquiry

HumiSeal® 1A27 conformal coating is:

  • Urethane chemistry
  • chemically resistant
  • single component
  • contains no free isocyanates
  • used in combination with Thinner 521
  • RoHS Directive 2015/863/EU
  • Recognized under UL File Number E105698.


HumiSeal® 1A27 conformal coating has:

  • excellent moisture and environmental protection for printed circuit assemblies
  • RoHS Directive 2002/95/EC compliance


Application of HumiSeal® 1A27 Conformal Coating

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.


Product Specification

Density, per ASTM D1475

0.96 ± 0.02 g/cm³

Solids Content, % by weight per Fed-Std-141, Meth. 4044

50 ± 3 %

Viscosity, per Fed-Std-141, Meth. 4287

3000 ± 1000 centipoise


480 grams/litre

Recommended Coating Thickness

25 – 75

Drying Time to Handle per Fed-Std-141, Meth. 4061

30 minutes

Optional Curing Conditions to Reach Optimum Properties

30 days at RT

30 hours @ 76°C

20 hours @ 88°C

Recommended Thinner (spraying)

HumiSeal Thinner 521

Recommended Stripper

HumiSeal Stripper 1063

Shelf Life at Room Temperature, DOM

24 months

Thermal Shock, 50 cycles per MIL-I-46058C

-65° to 125°C

Coefficient of Thermal Expansion – TMA

170 ppm/°C

Glass Transition Temperature – DSC


Modulus – DMA

18.1 MPa

Flammability, per UL 94


Dielectric Withstand Voltage, per MIL-I-46058C

>1500 volts

Dielectric Breakdown Voltage, per ASTM D149

7500 volts

Dielectric Constant, at 1MHz and 25°C per ASTM D150-98


Dissipation Factor, at 1MHz and 25°C per ASTM D150-98


Insulation Resistance, per MIL-I-46058C

2.0 x 1014 ohms(200TΩ)

Moisture Insulation Resistance, per MIL-I-46058C

1.2 x 1010 ohms (12GΩ)