Return-Path: Sender: (Marvin Kaye) To: lml Date: Thu, 26 Jun 2003 19:26:51 -0400 Message-ID: X-Original-Return-Path: Received: from [67.29.153.40] (HELO dparsons.com) by logan.com (CommuniGate Pro SMTP 4.1b8) with ESMTP id 2445232 for lml@lancaironline.net; Thu, 26 Jun 2003 17:17:18 -0400 Received: from QAUDAP1800 [38.113.130.49] by dparsons.com with ESMTP (SMTPD32-8.00) id A31D2C2D0086; Thu, 26 Jun 2003 17:18:21 -0400 X-Original-Message-ID: <012f01c33c28$5b7e5430$831ca8c0@QAUDAP1800> Reply-To: "Don Parsons" From: "Don Parsons" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: the guys in OR X-Original-Date: Thu, 26 Jun 2003 16:17:31 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Jarrett When I did my first test Hysol batches to get a feel for what it was like to work with, I encountered similar symptoms. I was able to determine that in my case, it was due to mixing problems. With Hysol being as thick as it is, it is very easy to have it be short of adequately mixed. I changed my mixing method based on a tip I got from Jim Nordin. I put the measured Part A and Part B on a white plastic board (mine is made of polyethylene, I got it from the scrap bin at a local plastics shop). Using a Bondo style plastic spreader, I alternate between spreading the two out, and then scraping them together into a small "glob". I just keep repeating this until the color throughout all of the material is a completely consistent color (sort of a bluish grey). It takes several iterations of spreading and collecting to get it completely mixed. You should see no color streaks at all in the material when you spread it out and it is fully mixed. This is much harder to judge when you mix it in a container. Since I started using this technique, every Hysol batch I have mixed has cured perfectly. Given what you are saying about your scales, and assuming you are measuring out the correct ratios, mixing would be at the top of my suspect list. As far as what you should do with the work already done on your parts, I would discuss it with Lancair. Post cure procedures can help minimize many cure problems, but there are limits to what that can fix. I am not sure which side of the limit your parts are on. Don Parsons ES-166-FB