842UR – Faraday Paint for Electronics

842UR is an electrically conductive coating designed for high volume board or package level EMI shielding. It can replace techniques like canning or stamping, reducing cost, board thickness, and mass. Designers can apply a thin coat of 842UR over a single component, preventing it from interfering with other components. The first-rate shielding also means the coating is ideal for a wide range of EMI applications including cell phones, computers and general communication systems.

The 842UR helps designers shield high-density circuits where many components interfere with each other. The shrinking circuit board makes it impossible to isolate select components. Instead, designers apply an insulator over the board first, then apply a conductive coating over top. The Insulator prevents electrical shorts while the conductive coating shields the circuit from interfering with itself.

The coating is flexible and does not chip or crack once cured. The 842UR is a useful alternative to sputter coating silicon wafers that is faster and more cost-effective. The coating is amply conductive to compete against pure metal coatings and maintains clean edges when machined post-coating.

The 842UR is a 1-part coating that is stable at room temperature. It only cures at high temperatures but has a relatively fast cure time. It adheres to multiple substrates including common plastics, metal, ceramics and glass. The coating also withstands extended exposure to high temperatures and salt spray with little performance loss.

Curing occurs in two stages. First, the solvent evaporates and the film becomes dry. Next, the high temperatures induce chemical crosslinking within the system, producing a tough polymer network. The cured film is highly durable and holds up well to many common fluids without softening and breaking down.

The cured polymer film is highly resistant to chemicals including solvents, oils and fuels. Acids and bases will degrade the silver flake, so avoid exposure to these substances. Moisture and salinity does not have the same effect as acids and bases. The 842UR shows high conductivity and minimal loss of adhesion after 30 days in a high salt environment.

This coating survives wave soldering as do our 2-part epoxy conductive coatings. For post-soldering or applications like shielding housing units, we offer acrylic coatings. Finally, we have a line of water-based coatings for shielding homes or projects that have strict environmental controls.

• Provides superior EMI shielding
• Excellent flexibility, toughness and adhesion
• Stable under extreme environmental conditions (100 hours at 150 ˚C, 100 hours at 85 ˚C/85% R.H.)
• Withstands wave soldering
• Designed for robotic spray application