The HumiSeal 1B51 Conformal Coating, made of synthetic rubber, is a fast-curing, one-component solution that is ideal for circuit assemblies and provides easy repair. Its low moisture vapor permeability, flexibility, and unique base polymer ensure minimal stress on components while offering protection against moisture and environmental factors. This coating can be applied using spraying, brushing, or dipping methods.
FEATURES
a fast drying
single component
synthetic rubber
used in combination with Thinner 535/521/521 EU
HumiSeal 1B51 conformal coating has
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
recognition under UL File Number E105698
Product Specification
Density, per ASTM D1475
0.89 ± 0.01 g/cm3
Solids Content, % by weight per Fed-Std-141, Meth. 4044
22 ± 1.5 %
Viscosity, per Fed-Std-141, Meth. 4287
185 ± 30 centipoise
VOC
694 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 (dipping & brushing)
HumiSeal Thinner 535
Recommended Thinner (spraying)
HumiSeal Thinner 521, 521EU
Recommended Stripper
HumiSeal 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 Vapor 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
