HumiSeal 2A64

Product Specification

Density, per ASTM D1475

1.07 ± 0.03 g/cm³

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

55 ± 5 %

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

130 ± 50 centipoise

VOC

501 grams/litre

Recommended Coating Thickness

25 – 75 microns

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

15 minutes

Optional Curing Conditions to Reach Optimum Properties

3 hrs @ 76°C

Recommended Thinner

HumiSeal® Thinner 64

Recommended Stripper

HumiSeal® Stripper 1072

Pot Life at Room Temperature

8 hours

Shelf Life at Room Temperature, DOM

12 months

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

-65°C to 125°C

Coefficient of Thermal Expansion – TMA

82 ppm/°C Below T_g
255 ppm/°C Above T_g

Glass Transition Temperature – DSC

12°C

Modulus – DMA

4101 MPa @ -40ºC
2777 MPa @ 25ºC
2 MPa @ 80ºC

Flammability, per MIL-I-46058C

Self-Extinguishing

Dielectric Withstand Voltage, per MIL-I-46058C

>1500 volts

Dielectric Breakdown Voltage, per ASTM D149

3500 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

0.024

Insulation Resistance, per MIL-I-46058C

4.5 x 10¹⁴ ohms (450TΩ)

Moisture Insulation Resistance, per MIL-I-46058C

4.8 x 10¹⁰ohms (48GΩ)

Fungus Resistance, per ASTM G21

Passes

HumiSeal 2A64 offers the following features:

Urethane chemistry

chemically resistant

two component

used in combination with Thinner 64

excellent moisture and environmental protection for printed circuit assemblies

fluorescence under UV light for ease of inspection

MIL-I-46058C qualified

IPC-CC-830 compliant

RoHS directive 2015/863/EU

Application of HumiSeal 2A64

For successful application of HumiSeal® 2A64, the cleanliness of the substrate is crucial. Contamination under the coating can lead to issues that may cause assembly failures. To ensure optimal performance, surfaces must be free moisture, dirt, wax, grease, flux residues, and any other contaminants. If applying this product over “no clean” assembly materials, users should conduct sufficient testing to confirm the compatibility and reliability of the coated assembly.

The recommended mixing ratio of Part A to Part B is 1:1 by volume. Before use, thoroughly mix HumiSeal® 2A64 Parts A and B until a homogeneous blend is achieved. Vigorous mixing should be avoided. Allow the mixed coating to settle for 30 minutes to let any air bubbles formed during blending escape.

Dipping

Depending on the complexity, density, and configuration of components on the assembly, you may need to reduce the viscosity of the prepared HumiSeal® 2A64 with HumiSeal® Thinner 64 to achieve a uniform film. After determining the optimal viscosity, maintain a controlled rate of immersion and withdrawal (5-15 cm/min) to ensure even coating deposition. The evaporation of solvent will cause viscosity to increase, so small amounts of HumiSeal® Thinner 64 should be added to maintain consistency. Regular viscosity checks with a Zahn or Ford viscosity cup are recommended.

Spraying

HumiSeal® 2A64 can be sprayed with conventional spraying equipment. Ensure the spraying area is well-ventilated to carry vapors and mist away the operator. To achieve a uniform spray pattern and avoid pinholes, it is necessary to add HumiSeal® Thinner 64. The recommended ratio of prepared HumiSeal® 2A64 to Thinner 64 is 1:1 by volume, although this may be adjusted depending on the specific spray equipment and operator technique.

Caution

Application of HumiSeal® Conformal Coatings must adhere to local and national health and safety regulations. Since the solvents in HumiSeal® Conformal Coatings are flammable, do not use the product in the presence of open flame or sparks. Ensure adequate ventilation to avoid inhalation of vapors or spray, and avoid direct contact with skin and eyes. Always consult the MSDS/SDS before use.