Parker Chomerics CHO-SHIELD® 4994 conductive coating is a very smooth, highly conductive, silver-filled polyurethane designed for military/aerospace airframe applications. CHO-SHIELD® 4994 is a metallic light brown colored polyurethane that is designed to be applied by standard high volume, low pressure spray equipment. Features and Benefits:• Superior conductivity (<0.075 ohms/square) and EMI shielding (>85 dB)• High flexibility or material for easy application in difficult geometries• Fluid resistance to solvents as well as operational and environmental fluids• Excellent pot life (3 hours) for application flexibility• Ambient temperature curing (7 days) or elevated temperature curing (4 hours) options• Can be applied to aluminum as well as non-conductive substrates
Packaging
4 component, 1 quart aluminum can kit, 4 component, 1 gallon aluminum can kit
Primer Included
Not required
Polymer Family
Polyurethane
Filler Material
Silver
Color
Metallic Light Brown
Shielding Effectiveness (dB)
> 85
Surface Resistance (ohms/square)
< .075
Specific Gravity
2.37
Ratio
100 : 18.3 : 1.4 : 20.9 by weight
Film Thickness (mm)
0.0762 to 0.1016
Temperature Range (C)
-40°C to 85°C (-40°F to + 185°F)
Shelf Life (Months)
6
