HumiSeal® 2A53 is a two component epoxy conformal coating supplied as Parts A and B, suitable for general printed circuit boards and applications where exceptional resistance to solvents or other chemicals is required. HumiSeal® 2A53 fluoresces under UV light for inspection purposes.
Application of HumiSeal® 2A53
Cleanliness of the substrate is of extreme importance for the successful application of a conformal coating. Surfaces must be free of moisture, dirt, wax, grease, flux residues and all other contaminants. Contamination under the coating could cause problems that may lead to assembly failures. Mixing ratio of Part A to Part B is 1:1 by volume. Prior to application, HumiSeal® 2A53 Parts A and B should be thoroughly mixed until a homogenous blend is achieved. Vigorous mixing is not recommended. The mixed coating should be allowed to settle for 30 minutes prior to use, so that any air bubbles formed during blending.
Specification:
Product Specification
Density, per ASTM D1475
0.93 ± 0.03 g/cm³
Solids Content, % by weight per Fed-Std-141, Meth. 4044
54 ± 5 %
Viscosity, per Fed-Std-141, Meth. 4287
350 ± 150 centipoise
VOC
455 grams/litre
Recommended Coating Thickness
25 - 75 microns
Drying Time to Handle per Fed-Std-141, Meth. 4061
5 hrs
Time Required to Reach Optimum Properties
7 days
Optional Curing Conditions to Reach Optimum Properties
2 hrs @ 93°C
Recommended Thinner
HumiSeal® Thinner 535
Pot Life at Room Temperature
24 hours
Shelf Life at Room Temperature, DOM
12 months
Thermal Shock, 50 cycles per MIL-I-46058C
-65°C to 125°C
Glass Transition Temperature – DSC
19°C
Coefficient of Thermal Expansion – TMA
56 ppm/°C
Modulus – DMA
32.2 MPa
Flammability, per MIL-I-46058C
Self-Extinguishing
Dielectric Withstand Voltage, per MIL-I-46058C
>1500 volts
Dielectric Breakdown Voltage, per ASTM D 149
8000 volts
Dielectric Constant, at 1MHz and 25°C per ASTM D150-98
3.0
Dissipation Factor, at 1MHz and 25°C per ASTM D150-98
0.03
Insulation Resistance, per MIL-I-46058C
2.0 x 1014 ohms (200TΩ)
Moisture Insulation Resistance, per MIL-I-46058C
2.8 x 1010 ohms (28GΩ)
Fungus Resistance, per ASTM G21
Passes
Resistance to Chemicals
Excellent
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