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Subject:	Re: static generated by masking tape
From:	Phillip Bavaro <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Fri, 5 Aug 2005 10:18:34 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (72 lines)

3M's polyimide backed tape #5419 series can be used for masking off electronics where high heat resistance and ESD protection are requirements.

If high heat resistance is not a requirement, such as in conformal coating masking applications, I have used 3M's # 250 series paperbacked masking tape provided that the humidity in the application room is above 30 percent.

Both of these tapes have excellent non-transfer properties of their adhesives and therefore are compatible with no clean assembly process lines.

Paper backed masking tape dispensing can also be performed under an ionizer but tapes that generate voltages above 200 volts are not recommended for use.

Hope this helps.

Phil

Joseph Matthews <[log in to unmask]> wrote:
Hi Billy,

3M (and presumably others) make a static-free tape -- in 3M's case its "42-Tape" I beleive, that's designed to be used in wave soldering. This is the answer to the static issue. Masking tape does produce static electricity both when you remove it form the roll and when you pull it off the components. Does that impact the components? Answer is, it could. CMOS and HCMOS parts being especially susceptable to static electricity. Point is, they make tapes for specifically this purpose and you may want to google "Static-Free Tape" and see what comes up (use the quotes and it'll look for the explicit string).

Hope this helps.

Joe

Billy Bharath wrote:
Hi All,
I seek your professional and or experience on this subject. A
certain process in the our assembly requires lengths of masking tape to be
stuck over components for later removal. An engineer argues that the removal
of the masking tape generates static which could damage the component.
Trouble is this practice has been in existence for few years with very
little rejects experienced. I am looking for any literature that supports or
rejects the engineers observations.
any assistance will be greatly appreciated.
Billy Bharath
Prism "Trusted Transactions"
Kwa-Zulu Natal
South Africa

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