HumiSeal 1A20

Product Specification

Density, per ASTM D1475

1.02 ± 0.02 g/cm³

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

50 ± 3 %

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

100 ± 30 centipoise

VOC

511grams/litre

Recommended Coating Thickness

25 -75 microns

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

60 minutes

Recommended Curing Conditions

24 hrs @ RT or 3 hrs @ 76°C

Time Required to Reach Optimum Properties

7 days

Thinner, if needed (dipping, brushing, spraying)

HumiSeal® Thinner 521, 521EU

Recommended Stripper

HumiSeal® Stripper 1072

Shelf Life at Room Temperature, DOM

6 months

Thermal Shock, per MIL-I-46058C

-65°C to 125°C

Coefficient of Thermal Expansion – TMA

515 ppm/°C

Glass Transition Temperature – DSC

71°C

Modulus – DMA

89.6 MPa

Flammability, per UL94

V-0

Dielectric Withstand Voltage, per MIL-I-46058C

>1500 volts

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

3.5

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

0.028

Insulation Resistance, per MIL-I-46058C

3.0 x 10¹⁴ohms (300TΩ)

Moisture Insulation Resistance, per MIL-I-46058C

4.8 x 10¹⁰ohms (48GΩ)

Fungus Resistance, per ASTM G21

Passes

Resistance to Chemicals

Excellent

HumiSeal 1A20 offers the following features:

Urethane chemistry

fast curing, chemically resistant

single component

used in combination with Thinner 521

RoHS Directive 2002/95/EC compliant

recognized under UL File Number E105698

excellent moisture and environmental protection for printed circuit assemblies

fluorescence under UV light for ease of inspection

MIL-I-46058C qualified

IPC-CC-830 compliance

RoHS directive 2015/863/EU

Application of HumiSeal 1A20

To achieve optimal results, conformal coatings should be applied to substrates that are thoroughly cleaned beforehand or assembled with low-residue “no clean” materials. It is important for users to conduct adequate testing to verify compatibility between the conformal coating and their specific assembly materials, process conditions, and cleanliness levels. For further assistance, please reach out to a HumiSeal representative.

Dipping

Depending on the complexity, density, and configuration of components on the assembly, it might be necessary to adjust the viscosity of HumiSeal 1A20 using HumiSeal Thinner 521 to ensure a uniform film. A controlled rate of immersion and withdrawal (typically 5 to 15 cm/min) helps achieve even coating application. As solvent evaporation during the process increases viscosity, small amounts of HumiSeal® Thinner 521 should be added to maintain optimal conditions. Regular viscosity checks in the dip tank can be performed using simple devices like a Zahn or Ford viscosity cup.

Spraying

HumiSeal 1A20 is compatible with conventional spraying equipment and should be applied in a well-ventilated area to carry away vapors and mist. Adding HumiSeal® Thinner 521 ensures a uniform spray pattern and a pinhole-free finish. The exact ratio of HumiSeal 1A20 to HumiSeal Thinner 521 (typically 1:1 by volume) and spray pressure should be adjusted based on the specific equipment and operator technique to achieve optimal coating results.