HumiSeal® 1A33 is a single component, polyurethane conformal coating, suitable for general printed circuit board applications. HumiSeal® 1A33 contains no free isocyanates and fluorescence under UV light for inspection purposes. 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.
HumiSeal® 1A33 conformal coating is:
HumiSeal® 1A33 conformal coating has:
Application of HumiSeal® 1A33 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.
Specification:
Product Specification
Density, per ASTM D1475
0.95 ± 0.02 g/cm3
Solids Content, % by weight per Fed-Std-141, Meth. 4044
44 ± 2 %
Viscosity, per Fed-Std-141, Meth. 4287
180 ± 20 centipoise
VOC
531 grams/lire
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
30 days at RT30 hours @ 76°C
20 hours @ 88°C
Recommended Thinner (dipping, brushing)
HumiSeal Thinner 503
Recommended Thinner (spraying)
HumiSeal Thinner 521, 521EU
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
193 ppm/°C
Glass Transition Temperature – DSC
26°C
Modulus – DMA
27.2 MPa
Flammability, per UL 94
V-0
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
3.6
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
1.6 x 1010 ohms (16GΩ)
CTI, PLC per UL746A @ 600 volts
0
Fungus Resistance, per ASTM G21
Passes
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