Agreed, the strength of urethane is to be very solvent resistant so it's going to take a strong stripper to work sufficiently. Which usually means potassium hydroxide. The last UR coated boards I stripped for LMCO, I used Humiseal stripper. Wasn't pretty but it was effective. If you are only doing small rework or replacing a single component, using CrystalMark's services will ease the pain. Lloyd Duso Plant Manager Diamond-MT (814) 535-3505 www.Diamond-mt.com On Tue, Jul 17, 2018 at 2:27 PM, Stadem, Richard D <[log in to unmask] > wrote: > Pardon my ignorance, but what is the issue with the stripper having > potassium hydroxide in it? > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory > Sent: Tuesday, July 17, 2018 11:55 AM > To: [log in to unmask] > Subject: Re: [TN] Urethane Coat Remover > > Hi Kate, > > Stripping Urethane coating as you know is very difficult to strip. If you > have a stripper that works well on the urethane, you then have to be > careful whether or not it will affect any other material on the assembly. I > found one that doesn't have potassium hydroxide in it. I've never used it, > so I don't know how well it works: > > https://www.miller-stephenson.com/product/conformal-coating-stripper/ > > These are the ingredients: > > Material > CAS No. Approx. % > 1,1,1,2,2,3,4,5,5,5-Decafluoropentane (HFC-43-10mee) > 138495-42-8 22 - 30% > Trans,1.2-Dichloroethylene > 156-60-5 45 - 50% > Methanol > 67-56-1 4 - 10% > N-Methyl-2-Pyrrolidone > 872-50-4 18 - 22% > > When we had a big project where we had to rework a bunch of boards that > were urethane coated, it was an engineering change where we had to remove > and replace parts on boards that were urethane coated we purchased a > micro-abrasion station from a company called CCR Co. > > http://www.ccrco.com/ > > I think I remember it being recommended by a Lockheed engineer. Anyways the > station worked great. The media used in the station is ESD safe which is > something you need to worry about when using a media-blasting station. > Urethane is best stripped when it is aged a bit. When it is freshly applied > the beads tend to bounce off. I remember if they didn't strip well I would > put them into an oven for a few hours to make the coating become a little > harder so it would strip easier. > > Steve > > On Tue, Jul 17, 2018 at 5:45 AM, Ekaterina Stees <[log in to unmask] > > > wrote: > > > Hello Technetters, > > Does anyone know of a chemical remover for urethane conformal coat that > > does not use potassium hydroxide as it's active ingredient? > > > > Thanks, > > Kate > > > > > > -- > Steve Gregory > Kimco Design and Manufacturing > Process Engineer > (208) 322-0500 Ext. -3133 > > -- > > > > This email and any attachments are only > for use by the intended > recipient(s) and may contain legally privileged, > confidential, proprietary > or otherwise private information. Any > unauthorized use, reproduction, > dissemination, distribution or other > disclosure of the contents of this > e-mail or its attachments is strictly > prohibited. If you have received > this email in error, please notify the > sender immediately and delete the > original. >