Silicone 1C49

HumiSeal® 1C49 conformal coating is:

  • silicone based
  • fluoresces under UV light
  • room temperature, moisture cure
  • single component
  • high solids

HumiSeal 1C49 conformal coating has:

  • no VOCs or solvent
  • low toxicity
  • excellent environmental resistance and moisture resistance
  • RoHS directive 2015/863/EU
  • Mil-I-46058C qualified
  • IPC-CC-830 qualified
  • recognized under UL file number E105698

Application of 1C49 Silicone Conformal Coating

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 a HumiSeal representative for additional information

1C49 is designed for application without additional thinning. Solvents or other thinners should not be mixed with 1C49. 1C49 may be applied by spray, brushing, flow coating or dipping. The time required to reach a tack-free state is dependent on ambient conditions such as temperature and relative humidity. The processing guidelines contained in this document were obtained with an ambient relative humidity of 50%.


A controlled rate of immersion and withdrawal (5-15 cm/min) will ensure even deposition of the coating and ultimately a uniform film. Blanketing dip tanks with an inert gas such as nitrogen can extend pot life.


HumiSeal® 1C49 may be applied 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 use of thinner is not required or recommended for HumiSeal® 1C49.


Uniformity of the film depends on the component density and the operator’s technique.


Product Specification
Density, per ASTM D1475 0.97 ± 0.03 g/cm³
Min. Solids Content, % by weight per Fed-Std-141, Meth. 4044 95 %
Viscosity, per Fed-Std-141, Meth. 4287 9000 ± 1500 centipoise
VOC 0 grams/litre
Recommended Coating Thickness 50 – 200 microns
Drying Time to Handle per Fed-Std-141, Meth. 4061 <10 mins
Recommended Curing Conditions 24 hrs @ RT or 20 min @ 76°C*
Time required to Reach Optimum Properties 7 days
Recommended Stripper HumiSeal Stripper 1091
Shelf Life at Room Temperature, DOM 12 months
Thermal Shock, 50 cycles per MIL-I-46058C -65°C to 200°C
Coefficient of Thermal Expansion – TMA 367 ppm /ºC
Glass Transition Temperature – DSC < -65°C
Storage Modulus – DMA 408 MPa @ -40ºC
1.6 MPa @ 25ºC
1.4 MPa @ 80ºC
Tensile, per ASTM D412 30-50 psi
Elongation, per ASTM D412 80-120 %
Build per Dip, per ASTM D823 5 mils
Flammability, per UL94 V-1
Dielectric Withstand Voltage, per MIL-I-46058C >1500 volts
Dielectric Breakdown Voltage, per ASTM D149 7000 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 0.01
Insulation Resistance, per MIL-I-46058C 5.0 x 1014 ohms (500TΩ)
Moisture Insulation Resistance, per MIL-I-46058C 1.0 x 1010 ohms (10GΩ)
Fungus Resistance, per ASTM G21 Passes

* Place an open pan of water in the oven during curing

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