HumiSeal 1B51 NSLU

Product Specification

Density, per ASTM D1475

0.81 ± 0.02 g/cm³

Solids Content, % by weight per Fed-Std-141, Meth. 4044

22 ± 2 %

Viscosity, per Fed-Std-141, Meth. 4287

185 ± 30 centipoise

VOC

632 grams/litre

Drying Time to Handle per Fed-Std-141, Meth. 4061

10 minutes

Recommended 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

Thinner 903, 905, 521EU

Recommended Stripper

Stripper 1080, 1080EU

Shelf Life at Room Temperature, DOM

18 months

Thermal Shock, 50 cycles per MIL-I-46058C

-65°C to 125°C

Coefficient of Thermal Expansion – TMA

55 ppm/°C

Glass Transition Temperature – DSC

14°C

Modulus – DMA

93.1 MPa @ -20°C73.5 MPa @ 0°C35.3 MPa @ 20°C

Moisture Vapour Transmission, per ASTM E398-03

<1 g/m²·day·mil

Dielectric Withstand Voltage, per MIL-I-46058C

>1500 volts

Dielectric Breakdown Voltage, per ASTM D149

4900 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

0.07

Insulation Resistance, per MIL-I-46058C

2.0 x 10¹⁴ohms (200TΩ)

Moisture Insulation Resistance, per MIL-I-46058C

1.0 x 10¹⁰ ohms (10GΩ)

Fungus Resistance, per ASTM G21

Passes

HumiSeal 1B51 NSLU offers the following features:

a fast drying

single component

synthetic rubber

environmentally friendly solvent blend

excellent moisture and environmental protection for printed circuit assemblies

extremely low moisture vapor permeability

excellent flexibility, enabling low stress on components

full compliance with the RoHS directive 2015/863/EU

UV additive for fluorescence

Application of HumiSeal® 1B51 NSLU

For successful application, conformal coatings can be effectively used on substrates that have been properly cleaned or on those assembled with low-residue “no clean” materials. It is essential for users to conduct proper testing to ensure compatibility between the conformal coating and their specific assembly materials, process conditions, and cleanliness levels. For more detailed information, please reach out to HumiSeal®.

Dipping

To achieve a uniform film, it may be necessary to reduce the viscosity of HumiSeal® 1B51 NSLU with HumiSeal® Thinner 903, 905, or 521EU, depending on the complexity and configuration of the assembly. Once the optimum viscosity is determined, a controlled rate of immersion and withdrawal (5-15 cm/min) will ensure an even deposition of the coating, resulting in a uniform film. As the solvent evaporates during application, viscosity will increase, and small amounts of HumiSeal® Thinner 903, 905, or 521EU should be added to adjust. Regular checks of the viscosity in the dip tank using a Zahn or Ford viscosity cup are recommended.

Spraying

HumiSeal® 1B51 NSLU can be sprayed using conventional spraying equipment in well-ventilated areas to ensure the vapor and mist are properly carried away the operator. To maintain a uniform spray pattern and avoid pinholes, the addition of HumiSeal® Thinner 521 or 521EU is necessary. The recommended ratio of HumiSeal® 1B51 NSLU to HumiSeal® Thinner 903, 905, or 521EU is 1:1 by volume, though adjustments may be required depending on the specific spray equipment and operator technique.