HumiSeal® 1C63 is a UV/RTV curing, oxime-type cure silicone conformal coating which provides excellent moisture and environmental protection for printed circuit assemblies. HumiSeal® 1C63 is a non-corrosive, single component coating which will cure upon exposure to either a UV light source or atmospheric moisture at ambient or elevated temperatures. The material is tack-free after exposure to UV light. A secondary moisture cure will cure unexposed areas of the coating within 24 hours at ambient temperature, 50% relative humidity. HumiSeal® 1C63 is self-leveling, with excellent weathering resistance. HumiSeal® 1C63 is recognized under UL File Number E105698 and RoHS Directive 2011/65/EC compliant.

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Product Specification

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