1B31 LOC

HumiSeal® 1B31LOC is a low VOC solvent based conformal coating that complies with most North American air quality regulations. HumiSeal® 1B31LOC is a fast drying, single component, acrylic coating that provides excellent moisture and environmental protection for printed circuit assemblies. HumiSeal® 1B31LOC demonstrates excellent flexibility and electrical properties, fluoresces under UV light for ease of inspection and is easily repaired. HumiSeal® 1B31LOC coating is MIL-I-46058C qualified, and IPC-CC-830 and RoHS Directive 2002/95/EC compliant.

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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.

Dipping
Depending on the complexity, density and configuration of components on the assembly, it may be necessary to reduce the viscosity of HumiSeal® 1B31LOC with HumiSeal® Thinner 701 in order to obtain a uniform film. Once optimum viscosity is determined, a controlled rate of immersion and withdrawal (5-15 cm/min) will further ensure even deposition of the coating and ultimately a uniform film. During the application, evaporation of solvent causes an increase in viscosity that should be adjusted by adding small amounts of HumiSeal® Thinner 701. Viscosity in the dip tank should be checked regularly, using a simple measuring device such as a Zahn or Ford viscosity cup.

Spraying
HumiSeal® 1B31LOC can be sprayed using conventional spraying equipment. Spraying should be done in an environment with adequate ventilation so that the vapour and mist are carried away from the operator. The addition of HumiSeal® Thinner 701 is necessary to ensure a uniform spray pattern resulting in pinhole-free film. The amount of thinner and spray pressure will depend on the specific type of spray equipment used and operator technique.

Brushing
HumiSeal® 1B31LOC may be brushed with a small addition of HumiSeal® Thinner 701. Uniformity of the film depends on component density and operator’s technique.

Product Specification

Product Specification
Density, per ASTM D1475 1.20 ± 0.03 g/cm3
Solids Content, % by weight per Fed-Std-141, Meth. 4044 25 ± 3 %
Viscosity, per Fed-Std-141, Meth. 4287 450 ± 25 centipoise
VOC 91 grams/litre
Drying Time to Handle per Fed-Std-141, Meth. 4061 25 minutes
Recommend Coating Thickness 25 – 75 microns
Recommended Curing Conditions 24 hrs @ RT or 30 min @ 76°C
Time Required to Reach Optimum Properties 7 days
Recommended Thinner HumiSeal Thinner 701
Recommended Stripper HumiSeal Stripper 1080, 1080EU
Shelf Life at Room Temperature, DOM 24 months
Thermal Shock, 50 cycles per MIL-I-46058C  -65°C to 125°C
Coefficient of Thermal Expansion – TMA  170 ppm/°C below Tg340 ppm/°C above Tg
Glass Transition Temperature – DSC 14°C
Modulus – DMA 2000 MPa @ -40°C1050 MPa @ 20°C

8.5 MPa @ 60°C

Flammability, per MIL-I-46058C  Self-Extinguishing
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 2.5
Dissipation Factor, at 1MHz and 25°C per ASTM D150-98 0.01
Insulation Resistance, per MIL-I-46058C 8.0 x 1014 ohms (800TΩ)
Moisture Insulation Resistance, per MIL-I-46058C 7.0 x 1010 ohms (60GΩ)
Fungus Resistance, per ASTM G21 Passes