HumiSeal 1B59LU

Product Specification

Density, per ASTM D1475

0.79 ± 0.02 g/cm³

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

18.5 ± 1.5 %

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

210 ± 70 cps

VOC

648 g/L

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

6-10 minutes

Recommended Coating Thickness

25 – 75 μm

Recommended Curing Conditions

24 hrs @ RT or 30 min @ 76°C

Time Required to Reach Optimum Properties

7 days

Recommended Thinners

HumiSeal® T903 or T904

Recommended Stripper

HumiSeal® Stripper 1080

Shelf Life at Room Temperature, DOM

12 months

Minimum Operating Temperature

-65 ºC

Maximum Operating Temperature

150 ºC

Glass Transition Temperature (DSC)

-49.6 °C

Coefficient of Thermal Expansion (TMA)

Below Tg: 18.5 ppm/°C

Above Tg: 130 ppm/°C

Dielectric Withstand Voltage, per MIL-I-46058C

>1500 volts

Dielectric Strength, Per JIS C2110.8.2.

85 KV/mm

Dielectric constant (23 ºC, 1 MHz)

1.9

Dissipation Factor (23 ºC, 1 MHz)

0.004

Insulation Resistance, per MIL-I-46058C

8.4 x 1012 Ohms (8.4 TΩ)

Moisture Insulation Resistance, per MIL-I-46058C

1.8 x 1010 Ohms (18 GΩ)

Surface Insulation Resistance (85 ºC / 85% RH, 50V)

9.5 log Ohms

Volume Resistivity

8.5 x 1015 Ohms.cm (8.5 PΩ)

Surface Resistivity

2.6 x 1015 Ohms per Sq. (2.6 PΩ)

Moisture Permeability (40 ºC / 90% R.H.)

26 g/m2·day (110 μm)

HumiSeal 1B59LU offers the following features:

a fast drying

single component

synthetic rubber

IPC-CC-830 compliant

improved temperature resistance up to 150ºC

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® 1B59 LU

Conformal coatings can be effectively applied to cleaned substrates or those assembled with low-residue “no clean” materials. It is essential for users to perform thorough testing to verify compatibility between the conformal coating and their specific assembly materials, cleanliness levels, and process conditions. For further assistance, please contact HumiSeal®.

Dipping

To achieve a uniform film, it may be necessary to adjust the viscosity of HumiSeal® 1B59 LU by adding HumiSeal® Thinner 903 or 904, depending on the complexity, density, and configuration of the components on the assembly. A controlled immersion and withdrawal rate (5-15 cm/min) is recommended for even coating deposition. Solvent evaporation during the application process may increase viscosity, requiring periodic adjustments with small amounts of thinner. Viscosity in the dip tank should be monitored regularly using devices like a Zahn or Ford viscosity cup.

Spraying

HumiSeal® 1B59 LU is compatible with conventional spraying equipment. Ensure proper ventilation during spraying to direct vapor and mist away the operator. Adding HumiSeal® Thinner 903 or 904 is necessary to create a uniform spray pattern and avoid pinholes in the coating. The thinner-to-coating ratio is typically 1:1 by volume, though adjustments may be required based on the spray equipment and operator technique.