Conformal coating: in house or contract assembly?
terms of local government legislation and cost to companies as is disposal of waste.
• Capital equipment cost—Can be costly and a return on investment calculation must be made.
• Maintenance/health and safety checks—The costs for confirming that the process is safe can be high. The costs for not checking that an operator and the facilities are safe can be literally devastating in terms of employee health and costs in compensation.
Contract coating service provider Advantages • No capital equipment costs—as long as the coating service provider (CSP) has the correct equipment for the process.
• Considerable expertise in coating—The optimum process can normally be determined and reached very quickly with little learning curve.
• No additional personnel—manpower supplied by the CSP.
Disadvantages • Lead times—even with same day processing there can be at least 24 hours delay, and in reality 2-3 days is
the norm for subcontract to CSPs.
• Scheduling work—The CSP may not have the capability to meet the lead times.
• Cost of service—A premium is added by the CSP which is to be balanced against the long term investments requirement.
• Transport and packaging costs—Again, part of the long-term investment costs.
• Vendor approval—Qualification and inspection to standards needs to be carried out to ensure the correct quality is met
There is never a right or wrong
choice when deciding how to proceed with coating the most important thing is making an informed choice. Often engineers criticize in-house and sub-contact services, but does that really mean the implementation plan was never right?
Selected text is taken from the interactive
CD-ROM on “Conformal Coating Design, Application and Defect Guide” sponsored by GEN 3 Systems, Humiseal, DIMA and SCH Technologies and available via SMTA, IPC, Electronics CA and the SMART Group. Bob Willis will be presenting conformal coating, Package on Package PoP, and vapour phase
workshops APEX during 2011. On-site, hands- on training workshops, webinars and inspection standards on PoP Technology are available
online, for information on these and more visit our website
www.PackageOnPackage.co.uk
Bob Willis is a process engineer providing
engineering support in conventional and surface mount assembly processes.He runs production lines for suppliers at exhibitions and also
provides seminar and workshops worldwide.
www.askbobwillis.com
Complex components need reliable protection.
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Global SMT & Packaging – Celebrating 10 Years – December 2010 – 5
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