Cho-Shield 576
CHO-SHIELD® 576 coating is a two component, silver-filled, highly conductive epoxy paint designed to provide EMI shielding when applied to a dielectric plastic substrate. This coating was specifically developed as a variant of CHOSHIELD 596.
CHO-SHIELD 576 dries to the touch in less than 1 hour at room temperature and attains full chemical resistance after 1 week at room temperature. However, the best electrical properties are achieved by curing at elevated temperatures.
CHO-SHIELD® 576 coating is a two component, silver-filled, highly conductive epoxy paint designed to provide EMI shielding when applied to a dielectric plastic substrate. This coating was specifically developed as a variant of CHOSHIELD 596.
CHO-SHIELD 576 dries to the touch in less than 1 hour at room temperature and attains full chemical resistance after 1 week at room temperature. However, the best electrical properties are achieved by curing at elevated temperatures.
PERFORMANCE
CHO-SHIELD 576 is first sprayed onto a plastic substrate, and further plating operations may follow. The full stack up of plating and coating will meet strict adhesion requirements, equivalent to ASTM D3359 with a rating of 5A after exposure to 95% RH at 65ºC for 24 hours and thermal cycling from one hour at -57ºC to one hour at 95ºC for a total of four cycles.
APPLICATION INSTRUCTIONS
Mix parts A and B in the ratio of 100 parts of A to 27.5 parts of B and 63.6 parts of toluene by weight. Always add parts B & toluene to the part A to minimize waste.
Apply the coating with an air gun such as a DeVilbiss Model EGA 502 with a 66SA air nozzle and 395 fluid nozzle. The spray viscosity range is typically 15 seconds (No. 2 Zahn Cup). The paint should be ready to use as mixed. Note: “Overthinning” degrades electrical performance. Consult Chomerics Applications Department for assistance as required.
Apply the coating to a 0.6 to 1.0 mil thickness. (A wet film of 2 mils is approximately 1 mil when dry.) A 30-minute solvent flash is required between coats. The last coat should dry at room temperature for at least one hour prior to any elevated cure.
Four cure schedules are listed below:
Cure 1: 2 hour at RT and 0.75 hour at 150°F, followed by 0.75 hour at 210°F (recommended), or
Cure 2: 1 hour at 75°F and 1 hour at 250°F, or
Cure 3: 1 hour at 75°F and 6 hours at 150°F, or
Cure 4: 168 hours at 75°F.
This warranty comprises the sole and entire warranty pertaining to items provided hereunder. seller makes no other warranty, guarantee, or representation of any kind whatsoever. All other warranties, including but not limited to, merchant ability and fitness for purpose, whether expressed, implied, or arising by operation of law, trade usage, or course of dealing are hereby disclaimed. Notwithstanding the foregoing, there are no warranties whatsoever on items built or acquired wholly or partially, to buyer’s designs or specifications.
Limitation of remedy: Seller’s Liability arising from or in any way connected with the items sold or this contract shall be limited exclusively to repair or replacement of the items sold or refund of the purchase price paid by buyer, at seller’s sole option. In no event shall seller be liable for any incidental, consequential or special damages of any kind or nature whatsoever, including but not limited to lost profits arising from or in any way connected with this agreement or items sold hereunder, whether alleged to arise from breach of contract, expressed or implied warranty, or in tort, including without limitation, negligence, failure to warn or strict liability.
- Details
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CHO-SHIELD® 576 coating is a two component, silver-filled, highly conductive epoxy paint designed to provide EMI shielding when applied to a dielectric plastic substrate. This coating was specifically developed as a variant of CHOSHIELD 596.
CHO-SHIELD 576 dries to the touch in less than 1 hour at room temperature and attains full chemical resistance after 1 week at room temperature. However, the best electrical properties are achieved by curing at elevated temperatures.
- Specs
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PERFORMANCE
CHO-SHIELD 576 is first sprayed onto a plastic substrate, and further plating operations may follow. The full stack up of plating and coating will meet strict adhesion requirements, equivalent to ASTM D3359 with a rating of 5A after exposure to 95% RH at 65ºC for 24 hours and thermal cycling from one hour at -57ºC to one hour at 95ºC for a total of four cycles.
APPLICATION INSTRUCTIONS
Mix parts A and B in the ratio of 100 parts of A to 27.5 parts of B and 63.6 parts of toluene by weight. Always add parts B & toluene to the part A to minimize waste.
Apply the coating with an air gun such as a DeVilbiss Model EGA 502 with a 66SA air nozzle and 395 fluid nozzle. The spray viscosity range is typically 15 seconds (No. 2 Zahn Cup). The paint should be ready to use as mixed. Note: “Overthinning” degrades electrical performance. Consult Chomerics Applications Department for assistance as required.
Apply the coating to a 0.6 to 1.0 mil thickness. (A wet film of 2 mils is approximately 1 mil when dry.) A 30-minute solvent flash is required between coats. The last coat should dry at room temperature for at least one hour prior to any elevated cure.
Four cure schedules are listed below:
Cure 1: 2 hour at RT and 0.75 hour at 150°F, followed by 0.75 hour at 210°F (recommended), or
Cure 2: 1 hour at 75°F and 1 hour at 250°F, or
Cure 3: 1 hour at 75°F and 6 hours at 150°F, or
Cure 4: 168 hours at 75°F. - Resources
- Warranty
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This warranty comprises the sole and entire warranty pertaining to items provided hereunder. seller makes no other warranty, guarantee, or representation of any kind whatsoever. All other warranties, including but not limited to, merchant ability and fitness for purpose, whether expressed, implied, or arising by operation of law, trade usage, or course of dealing are hereby disclaimed. Notwithstanding the foregoing, there are no warranties whatsoever on items built or acquired wholly or partially, to buyer’s designs or specifications.
Limitation of remedy: Seller’s Liability arising from or in any way connected with the items sold or this contract shall be limited exclusively to repair or replacement of the items sold or refund of the purchase price paid by buyer, at seller’s sole option. In no event shall seller be liable for any incidental, consequential or special damages of any kind or nature whatsoever, including but not limited to lost profits arising from or in any way connected with this agreement or items sold hereunder, whether alleged to arise from breach of contract, expressed or implied warranty, or in tort, including without limitation, negligence, failure to warn or strict liability.
