Rich, I couldn't agree more. And our batting average is about the same as yours, .500. We need more customers like Doug. Lloyd Duso Plant Manager Diamond-MT (814) 535-3505 www.Diamond-mt.com On Thu, Sep 22, 2016 at 3:38 PM, Richard Kraszewski < [log in to unmask]> wrote: > Steve - We see the same issue when it gets really thin. We proceed as > follows: > > > State that fluorescence of a coating is an aide to inspection, not a > requirement. > > Coating will often thin -out at sharp edges. Laws of physics related > to surface tension & surface energy. > > If insufficient coating is suspected with UV & their naked eye > (spectacles are OK), operators can use up to 4X magnification and nature > white lighting to determine if coating is present based upon gloss. > > Common customer reply is that if coating is indeed present, then is must > be too thin to be in specification. > To which we reply back that the industry (IPC) understands this > phenomenon and a Qpanel hence can be used to monitor and control > thickness. If perfect coating uniformity is required , parylene should > be called out. > > We are successful in the above argument with customers perhaps 50% of the > time at best. Rest of the time we touch up. ;>( > > Rich Kraszewski / PLX > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory > Sent: Thursday, September 22, 2016 10:36 AM > To: [log in to unmask] > Subject: Re: [TN] Fwd: coating complaint > > Hi Guy, > > I got your photos posted, had to do a little repair with my web page > software after the last Windows update. Here are the images: > > http://stevezeva.homestead.com/coating_under_no_filter.jpg > http://stevezeva.homestead.com/customer_complaint-skips.jpg > http://stevezeva.homestead.com/coating_under_UV2.jpg > http://stevezeva.homestead.com/coating_under_UV2-1.jpg > > I see the same thing on component edges sometimes. It's like the UV tracer > in the coating thins out or separates out and under UV light it looks like > there's no coating. We've got stuff kicked from a customer for this > problem. If I can find the photos I'll post mine... > > Steve > > On Thu, Sep 22, 2016 at 7:56 AM, Guy Ramsey <[log in to unmask]> wrote: > > > I am in over my head. I have little to no experience with conformal > > coating. Can anyone with more experience comment? > > thanks, > > Guy > > ---------- Forwarded message ---------- > > From: Guy Ramsey <[log in to unmask]> > > Date: Thu, Sep 22, 2016 at 9:51 AM > > Subject: Fwd: coating complaint > > To: [log in to unmask] > > > > > > I sent this message on to a friend who posts images for review by > > members of the IPC technet. > > We are looking for technical support and user experiences with this > > material. > > If we inspect at 5x-10x magnification we can observe the conditions > > that our customer is complaining about. > > But, our application process seems well controlled and the condition > > does not exist when the material is first dispensed. The material > > flows as it cures and becomes thin at the edges of the components. > > Thin enough so that is does not glow under UV light. In some instances > > components appear to have no coating (when viewed under UV). However > > under normal light it is easy to see the parts are coated. > > Is this normal behavior for the material? Can we expect normal > > performance from the the coating? > > Guy Ramsey > > > > ---------- Forwarded message ---------- > > From: Guy Ramsey <[log in to unmask]> > > Date: Thu, Sep 22, 2016 at 9:41 AM > > Subject: coating complaint > > To: Steve Gregory <[log in to unmask]> > > > > > > Hi Steve, > > Can you post these images on your homestead page for the group please? > > The images are of acrylic coating Humiseal 1B31. We are applying a > > thinned mix using a dispenser through a fine needle (25AWG). > > > > Under room lighting we can see coating. Under UV light, at this > > magnification our customer is complaining about skips. I don't have > > enough experience with the material to know if this is normal or not. > > Notice how the resistor appears to have no coating under UV, but in > > normal light it is clearly coated. > > Also notice how the coating flows off of the components at the edges, > > leaving only a thin coating that may not glow under UV light. > > Are these normal attributes of this type coating. > > > > We do not see this with Urethane spray coatings. > > > > -- > > > 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. >