Silicone 1C63

HumiSeal® 1C63 conformal coating is:

  • silicone based
  • fluoresces under UV light
  • UV/RTV cure
  • single component
  • high solids

HumiSeal 1C63 conformal coating has:

  • No VOCs or solvent
  • low toxicity
  • excellent environmental resistance and moisture resistance
  • RoHS directive 2015/863/EU
  • Recognized under UL file number E105698

Application of 1C63 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.

1C63 is designed for application without additional thinning. Solvents or other thinners should not be mixed with 1C63. 1C63 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%.


HumiSeal® 1C63 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® 1C63.


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


HumiSeal® 1C63 is a highly cross-linked coating. In order to achieve maximum cross-linking density, the product must be exposed to the correct spectral output. The table below outlines the required dosage and irradiance values necessary to properly cure HumiSeal® 1C63. After UV exposure and return to room temperature, the coating should be tack free.

HumiSeal® 1C63 was designed to be cured using a microwave UV oven equipped with an “H” style bulb. Arc systems can cure HumiSeal® 1C63 however care must be taken during the equipment selection process to ensure minimum dosage and irradiance values can be obtained. Due to the variations possible in curing equipment type and configuration, it is strongly recommended that you contact HumiSeal® Technical Support to discuss your equipment and process in detail.

Product Specification
Density, per ASTM D1475 1.04 ± 0.06 g/cm³
Viscosity, per Fed-Std-141, Meth. 4287 3500 ± 1500 centipoise
VOC < 50 grams/litre
Room Temperature Skin Over Time, 1/8″ thickness 60 minutes
Recommended UV Cure* See curing section on TDS
Secondary Cure, for shadow areas 24 hrs @ RT or 20 min @ 76°C
Time required to Reach Optimum Properties, 1/8″ thickness 7 days
Recommended Stripper HumiSeal® Stripper 1091
Shelf Life at Room Temperature, DOM 6 months
Thermal Shock, 50 cycles per MIL-I-46058C -65°C to 200°C
Glass Transition Temperature – DSC < -90°C
Tensile Strength, per ASTM D412 100 psi
Elongation, per ASTM D412 100%
Volume Resistivity, per ASTM D257 7.97 x1014 ohm-cm
Surface Resistivity, per ASTM D257 6.26 x1017 ohms per square
Shore Hardness, A, per ASTM D2240 15
Flammability, per UL94 V-1
Dielectric Withstand Voltage, per MIL-I-46058C >1500 volts
Insulation Resistance, per MIL-I-46058C 1.1 x 1012 ohms (1.1TΩ)
Moisture Insulation Resistance, per MIL-I-46058C 1.1 x 1010 ohms (10GΩ)
Fungus Resistance, per ASTM G21 Passes

*Microwave UV cure ovens equipped with “H” style bulbs recommended

Other products in this chemistry include:

To view SDS files you need to Login or Request Access.

Contact Us