RFI/EMI SHIELD COATINGS FOR INDUSTRY

Glossary of Terms

Radio Frequency Interference (RFI) - Used interchangeably with EMI.  EMI is a later definition which includes the entire electromagnectic spectrum, whereas RFI is more restricted to the radio frequency band, generally considered to be between 10kHz - 10GHz

Electromagnectic Interference (EMI) - Impairment of the functioning of a device, equipment or system caused by an electromagnetic disturbance.

Description of Process and Benefits

The coating is a sprayable metallic system using a specially formulated non-oxidizing copper as the conductive element.  This was developed for use as an RFI/EMI shield for plastic electronic equipment housings.  It can be used on acrylics, ABS and structural foams, (e.g. Noryl, Valox etc.) as well as solvent sensitive substrates such as polycarbonate and polystyrene.  Attenuation is more than 75 db form 1 MHz to 1GHz. Surface resistivity is <0.05 ohms/sq. @ 1 mil dry film thickness and<0.025 + 0.005 ohms/sq.  @ 2 mils dry film thickness.

SUMMARY OF FINISHES

Conductive Nickel Coatings

Designed to shield against radiated electromagnetic Interference (EMI) and protection.
Nickel coating combines increased conductivity with improved economy. It performs well in environmental conditions such as high humidity or heat.

Conductive Silver Coatings

Resistivity: 0.01 ohm . mil
Reduces or elimates EMI/RFI interference.  A general purpose EMI/RFI shielding for use on plastic electronics enclosures.  Consists of a tough, durable acrylic base pigmented with a high purity silver.  Has a resistance of 0.01 ohms . cm.

Conductive Silver Coated Copper Coatings

Resistivity: 0.15 ohm . mil
Reduces or elimainates EMI/RFI interference.  A general purpose EMI/RFI Shielding for use on plastic electronic enclosures.  Consists of a tough, durable acrylic base pigmented with a high purity silver coated copper. Has a resistance of 0.15 ohms . cm.

Typical Applications