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Chase Electronic Coatings HumiSeal® 1B59LU Rubber Conformal Coating
Categories: Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)

Material Notes: HumiSeal® 1B59LU is an air drying, single component, synthetic rubber conformal coating. The unique chemistry, of HumiSeal® 1B59LU imparts extremely low moisture vapor permeability and improved heat resistance. The coating demonstrates excellent flexibility, low stress on components, fluoresces under UV for ease of inspection and is easily repaired. The coating is in full compliance with the RoHS Directive 2011/65/EC and meets the requirements of IPC-CC-830.

Information provided by Chase Electronic Coatings.

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Physical PropertiesOriginal ValueComments
Density 0.790 g/ccASTM D1475
Solids Content 18.5 %By weight, ± 1.5%; Fed-Std-141, Meth. 4044
Volatile Organic Compounds (VOC) Content 648 g/l
Water Vapor Transmission 26.0 g/m²/day
@Temperature 40.0 °C
90% R.H
Viscosity 140 - 280 cPFed-Std-141, Meth. 4287. Part A
Thickness 25.0 - 75.0 micronsRecommended coating
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 8.50e+15 ohm-cm
Surface Resistance 3.10e+9 ohm
@Temperature 85.0 °C
85% RH, 50V
Surface Resistivity per Square 2.60e+15 ohm
Insulation Resistance 1.80e+10 ohmMoisture; MIL-I-46058C
 8.40e+12 ohmMIL-I-46058C
Dielectric Constant 1.9
@Frequency 1e+6 Hz,
Temperature 23.0 °C
Dielectric Strength 85.0 kV/mmJIS C2110.8.2.
Dissipation Factor 0.0040
@Frequency 1e+6 Hz,
Temperature 23.0 °C
 
Thermal PropertiesOriginal ValueComments
CTE, linear 18.5 µm/m-°C
@Temperature <=-49.6 °C
Below Tg; TMA
 130 µm/m-°C
@Temperature >=-49.6 °C
Above Tg; TMA
Maximum Service Temperature, Air 150 °C
Minimum Service Temperature, Air -65.0 °C
Glass Transition Temp, Tg -49.6 °CDSC
 
Processing PropertiesOriginal ValueComments
Cure Time 5.00 hour
@Temperature 76.0 °C
Option
 24.0 hour
@Temperature 23.0 °C
 168 hour
@Temperature 23.0 °C
Optimum Properties
Tack-Free Time 0.100 - 0.170 hourFed-Std-141, Meth. 4061
Shelf Life 6.00 Month
@Temperature 23.0 °C
DOM
 
Descriptive Properties
Dielectric Withstand>1500 Vper MIL_I_46058C

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