Urethanes Conformal coating 1A33

Model No:	1A33

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.

Product Enquiry

HumiSeal® 1A33 conformal coating is:

Urethane chemistry
chemically resistant
single component
contains no free isocyanates
used in combination with Thinner 503/521
MIL-I-46058C qualified
RoHS Directive 20115/863/EU
Recognized under UL File Number E105698

HumiSeal® 1A33 conformal coating has:

excellent moisture and environmental protection for printed circuit assemblies
fluorescence under UV light for ease of inspection

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 10¹⁴ohms (200TΩ)
Moisture Insulation Resistance, per MIL-I-46058C	1.6 x 10¹⁰ohms (16GΩ)
CTI, PLC per UL746A @ 600 volts	0
Fungus Resistance, per ASTM G21	Passes