Hi Paul I see that Rudy has already made a very important comment. There is a recommendation out there from Du Pont. My vague recollection was under 20% but would need to confirm (and for the operator less than 0.08%... ;-) Cheers, Joe In a message dated 12/3/2008 12:15:21 P.M. Pacific Standard Time, [log in to unmask] writes: Good catch Joe... I forgot about the alcohol... Do you remember the amount required? Paul Paul Edwards Surface Art Engineering -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad Sent: Wednesday, December 03, 2008 10:26 AM To: [log in to unmask] Subject: Re: [TN] Stripping Magnet Wire A quick caveat, etchability depends greatly on the polyimide formulation. Addition of ethanol can improve etch rate (and possibly the operator's mood, if the addition is made to him as well ;-) Joe In a message dated 12/3/2008 9:55:39 A.M. Pacific Standard Time, [log in to unmask] writes: If you can get a hold of it... 1 Molar KOH @ 60-80 C was used to etch kapton windows in TAB tape structures a few years ago... Paul Paul Edwards Surface Art Engineering -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Diamond, Patrick Sent: Tuesday, December 02, 2008 11:14 PM To: [log in to unmask] Subject: Re: [TN] Stripping Magnet Wire At my last company which was in the aerospace industry, we used to use a sodium hydroxide solution called Novastrip 60 (industrial paint stripper), heated to 104 Dec C. This worked extremely well on polyimide wires even down to 0.012", had to ensure it was neutralised for 3 mins in D.I. water after exposure. We used to strip hundreds of coils a week using this method so we had a semi-automated computer based machine and a fully enclosed tank for HSE reasons. If you want more info. Contact me offline. Pat Diamond Harris Systems Winnersh UK -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Kane, Joseph E (US SSA) Sent: 02 December 2008 15:28 To: [log in to unmask] Subject: [TN] Stripping Magnet Wire To remove polyimide insulation from 38 gage magnet wire, we've been using a chemical stripper (Lonco 504 paste), which is going obsolete. I saw something in the archives about Insulstrip Jell from Ambion, does anyone have other recommendations, chemical, mechanical, or other? 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