Press Release Summary:
Form-in-place Cho-FormÂ® 5541 is galvanic-corrosion resistant and provides electrical stability in environments such as urban gas, salt fog, and high temperatures, as well as in high temperature/high humidity cycling. Single-component, electrically conductive, silicone elastomer contains nickel-plated graphite particles. Gasket material provides shielding effectiveness above 70 dB, from 200 MHz to 10 GHz, and meets UL 94V-0 flammability requirements.
Original Press Release:
New Form-in-Place EMI Shielding Gaskets Provide Long-Term Stability in Severe Environments
JANUARY 11, 2002, WOBURN, MASSACHUSETTS -- Chomerics, a division of the Parker Hannifin Corporation, has introduced Cho-Form® 5541 corrosion-resistant, form-in-place EMI shielding gasket material. Cho-Form 5541 gaskets provide excellent EMI shielding and demonstrate superior galvanic corrosion resistance when dispensed on bare metal electronics housings, such as base station PCB covers and other electronic equipment with required long service life. The high shielding effectiveness and electrical stability of Cho-Form 5541 material has been validated in severe environments such as urban gas, salt fog, and high temperatures, as well as in high temperature/high humidity cycling. Test data is available on request from Chomerics. The 5541 material is a single component, electrically conductive silicone elastomer containing nickel-plated graphite particles. Cho-Form 5541 gaskets are robotically dispensed onto customer enclosures or castings and heat-cured in just 30 minutes, allowing fast handling, QC inspection, and packaging of dispensed parts. The gaskets provide shielding effectiveness above 70 dB from 200 MHz to 10 GHz, and meet UL 94V-0 flammability requirements. Cho-Form 5541 material is provided in 6-ounce (180 cc) cartridges containing 350 grams of compound. Cho-Form 5541 is the newest material in the Chomerics family of form-in-place, conductive elastomer EMI gasket products. Chomerics provides gasket dispensing services, design assistance and parts prototyping on a global basis. Prices for dispensed gaskets on cellular handsets and other small wireless devices are typically less than $1.00. Actual pricing depends on gasket cross section, developed length, programmed starts/stops in the dispensed pattern, and part volume levels.