Product Description

HumiSeal® 1B73 conformal coating is:

• an acrylic chemistry
• fast drying
• single component
• recognized under UL File Number E105698
• used in combination with Thinner 73 or 730EU

HumiSeal 1B73 conformal coating has:

• excellent moisture and environmental protection for printed circuit assemblies
• excellent flexibility
• fluorescence under UV light for ease of inspection
• reworkability with ease
• MIL-I-46058C qualification
• IPC-CC-830 compliance
• RoHS directive 2015/863/EU

Application of 1B73 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. Please contact a HumiSeal representative for additional information.

Dipping
Depending on the complexity, density and configuration of components on the assembly, it may be necessary to reduce the viscosity of HumiSeal 1B73 with HumiSeal Thinner 503 in order to obtain a uniform film. Once optimum viscosity is determined, a controlled rate of immersion and withdrawal (typically, 5 to 15 cm/min) will further ensure even deposition of the coating and provide a uniform film. During application, evaporation of solvent causes an increase in viscosity that should be adjusted by adding small amounts of HumiSeal® Thinner 73. Viscosity in the dip tank should be checked regularly using a simple measuring device, such as a Zahn or Ford viscosity cup.

Spraying
HumiSeal 1B73 can be sprayed using conventional spraying equipment. Spraying should be done in an environment with adequate ventilation so that vapor and mist are carried away from the operator. The addition of HumiSeal® Thinner 73 is necessary to ensure a uniform spray pattern resulting in a pinhole-free film. The amount of thinner and spray pressure will depend on the specific type of spray equipment and operator technique. The recommended ratio of HumiSeal 1B73 to HumiSeal Thinner 73 is 1:1 by volume; however, the ratio may need to be adjusted to obtain a uniform coating.

Brushing
HumiSeal 1B73 may be brushed with a small addition of HumiSeal Thinner 73. Uniformity of the film depends on the component density and operator technique.

Product Specification
Density, per ASTM D1475	0.92 ± 0.02 g/cm³
Solids Content, % by weight per Fed-Std-141, Meth. 4044	29.5 ± 2 %
Viscosity, per Fed-Std-141, Meth. 4287	250 ± 20 centipoise
VOC	661 grams/liter
Drying Time to Handle per Fed-Std-141, Meth. 4061	30 minutes
Recommended Coating Thickness	25 -75 microns
Recommended Curing Conditions	24 hrs @ RT or 2 hrs @ 76°C
Time Required to Reach Optimum Properties	7 days
Recommended Thinner	HumiSeal® Thinner 73
Recommended Stripper	HumiSeal® Stripper 1080, 1080A
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	67 ppm/°C
Glass Transition Temperature – DSC	42°C
Modulus – DMA	11.1 MPa
Flammability, per UL 94	V-0
Dielectric Withstand Voltage, per MIL-I-46058C	>1500 volts
Dielectric Breakdown Voltage, per ASTM D149	6300 volts
Dielectric Constant, at 1MHz and 25°C, per ASTM D150-98	2.6
Dissipation Factor, at 1MHz and 25°C, per ASTM D150-98	0.010
Insulation Resistance, per MIL-I-46058C	5.5 x 1014 ohms (550TΩ)
Moisture Insulation Resistance, per MIL-I-46058C	7.0 x 1010 ohms (70GΩ)
Fungus Resistance, per ASTM G21	Passes

Price Terms︰ FOB ShenZhen

Payment Terms︰ TT

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