The 842 Silver Conductive Coating is a very highly conductive acrylic paint designed to reduce electromagnetic or radio frequency interference (EMI/RFI). Long-term protection from EMI/RFI is assured by its durable acrylic resin that minimizes loss of metallization through rubbing, and by the oxidation resistant silver that slows down conductivity degradation with age. The flake shape helps ensure maximum points of contact to ensure better conductivity. In addition, loss of shielding through paint peeling is unlikely since the acrylic resin system was shown, in UL related testing, to adhere to even difficult substrates like ABS and polycarbonates.

• High Conductivity (≥15 Siemen)—Low Surface resistance of ≤0.066 Ω/sq for a 1 mil coat
• Tough and durable coating
• Rub off resistant
• Corrosion resistant coating
• Stronger adhesion than water based coatings
• Low VOC’s
• Median attenuation 75 dB ±20 dB per 25.4 μm (~1.0 mil) for frequency range of 10 MHz to 18 GHz

Applications & Usages:

Its primary application is to provide an excellent-conductivity EMI/RFI shielding suitable for harsh environments. It may also act as a conductive base for applications where it is necessary to impart the highest degree of conductivity to a surface. As well, the silver is non-magnetic, offering a low relative permeability that provides reasonable skin depths, which makes it suitable for microwave transmissions applications.

Compatibility:

Chemical—The silver filler is quite resistant to oxidation, except in environments that contain contaminants like H2S or ozone which tarnish its surface. Unlike many other metal oxides, silver oxide remains conductive so degradation due to oxidation are not as bad.

The thermoplastic resin is dissolved by common paint solvents like toluene, xylene, acetone, and MEK. This allows great coating repair and work characteristics, but it does make the coating unsuitable for solvent rich environments.

Adhesion—The 842 coating adheres to most plastics used to house printed circuit assemblies; however, it is not compatible with contaminants like water, oil, and greasy flux residues that may affect adhesion. If contamination is present, clean the surface to be coated first.

Specifications

AEROSOL SPECIFICATIONS: Curing & Work Schedule Liquid Dry to Touch (aerosol) 3 to 5 mins Recoat time (aerosol) 2 mins Full Cure at room temp. 24 hours Full Cure at 65 °C 30 mins Shelf Life 3 years Storage Temperature Limits -5 to 40 °C (23 to 104°F) Service Ranges Liquid Service Temperature -40 to +120 °C (-40 to +248 °F) Maximum Coverage (per 900mL) < 168,000 cm2 (<180 ft2) Maximum Coverage (per US gallon) < 709,000 cm2 (<763 ft2) Electric & Magnetic Properties - Cured Surface Resistance (Liquid): See Chart     Resistance Conductance 1 × coat @ 1.0 mil 0.066 ohm/sq 15 S 2 × coats @ 2.0 mil 0.055 ohm/sq 18 S 3 × coats @ 2.2 mil 0.0409 ohm/sq 25 S Magnetic Class   Diamagnetic (Non-magnetic) Relative Permeability   <1.0 Shielding Attenuation: Frequency  Attenuation for 33 µm [1.0 mil]     IEEE STD 299-1997 10 to 100 kHz 54 dB to 75 dB   100 kHz to 1 MHz 50 dB to 65 dB   1 MHz to 10 MHz 54 dB to 65 dB   10 MHz to 100 MHz 41 dB to 54 dB   100 MHz to 1 GHz 35 dB to 67 dB   1 GHz to 10 GHz 41 dB to 59 dB   10 GHz to 18 GHz 36 dB to 72 dB Physical Properties - Cured Resin technology Thermoplastic Color Metallic Silver Grey Abrasion resistant Yes Blister resistant Yes Peeling resistant Yes Water and salt spray resistant Yes Physical Properties - Uncured Mixture Color Metallic Silver Grey Density @25 °C 2.15 g/mL Solids Percentage (wt/wt) ~73% Viscosity at 25 °C [77 °F] ~8,000 cP Flash Point -16 °C (3.2 °F) Odor Ethereal, benzene-like

Available Sizes

Catalog Number Sizes Available Description 842-900ML 1.6 kg (900 mL) Liquid - Bulk 842-1G 6.4 kg (1 gallon) Liquid - Bulk