1B59LU

Synthetic Rubber 1B59LU

HumiSeal® 1B59 LU conformal coating is:

  • a fast drying
  • single component
  • synthetic rubber
  • IPC-CC-830 compliant

HumiSeal 1B59 LU conformal coating has:

  • 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 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 HumiSeal® 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® 1B591 LU with HumiSeal® Thinner 903, 904  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 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 903, 904. Viscosity in the dip tank should be checked regularly, using a simple measuring device such as a Zahn or Ford viscosity cup.

Spraying
HumiSeal® 1B59 LU can be sprayed using conventional spraying equipment. Spraying should be done in an environment with adequate ventilation so that the vapor and mist are carried away from the operator. The addition of HumiSeal® Thinner 903, 904 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 used and operator technique. The recommended ratio of HumiSeal® 1B59 LU to HumiSeal® Thinner 903, 904 is 1:1 by volume; however, the quantities may need to be adjusted to obtain a uniform coating.

Brushing
HumiSeal® 1B59 LU may be brushed with a small addition of HumiSeal® Thinner 903, 904. Uniformity of the film depends on the component density and the operator’s technique.

Properties of HumiSeal® 1B59LU

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 6 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)

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