Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Wed, 06 Oct 2004 22:34:33 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m14.mx.aol.com ([64.12.138.204] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 455680 for lml@lancaironline.net; Wed, 06 Oct 2004 22:15:15 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.204; envelope-from=Newlan2dl@aol.com Received: from Newlan2dl@aol.com by imo-m14.mx.aol.com (mail_out_v37_r3.8.) id q.cf.1841c0b8 (4552) for ; Wed, 6 Oct 2004 22:14:43 -0400 (EDT) From: Newlan2dl@aol.com X-Original-Message-ID: X-Original-Date: Wed, 6 Oct 2004 22:14:42 EDT Subject: Re: [LML] Re: Bond prepping, acetone, paint color, stub wing skin peel X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1097115282" X-Mailer: 9.0 for Windows sub 5032 -------------------------------1097115282 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Hi Mike I don't have any experience with that epoxy but it does appear to be a 2 phase (i.e. toughened with the elastomer being the second phase/reaction). That description they give is pretty much the description you have with the 2 phase epoxies. The thing to watch is the HDT and Tg (Heat Distortion Temperature and Glass transition temp, the later normally 10 degrees or so warmer). The two phase epoxies when done as a room temp cure tend to need some post cure heat to have a good higher temp working temperature. And there are very many types of 2 phase epoxies! Some can be used in rocket motors and others couldn't survive being made as a dinner plate for pizza. There are also different degrees of impact strength that can be traded off so it gets to customer specific applications. Most of the stuff we do on our planes is pretty low tech and not even close to the "state of the art" which means there is a large safety margin and that we are carrying a lot of weight to give us that margin of safety. CPD (Composite Polymer Designs) and Applied Poleramic have a lot of different toughened formulations. Dan Dan -------------------------------1097115282 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Hi Mike

I don't have any experience with that epoxy but it does appear to be a=20= 2 phase (i.e. toughened with the elastomer being the second phase/reaction).= That description they give is pretty much the description you have wi= th the 2 phase epoxies. The thing to watch is the HDT and Tg (Heat Dis= tortion Temperature and Glass transition temp, the later normally 10 degrees= or so warmer). The two phase epoxies when done as a room temp cure te= nd to need some post cure heat to have a good higher temp working temperatur= e. And there are very many types of 2 phase epoxies! Some can be= used in rocket motors and others couldn't survive being made as a dinner pl= ate for pizza. There are also different degrees of impact strength tha= t can be traded off so it gets to customer specific applications. Most= of the stuff we do on our planes is pretty low tech and not even close to t= he "state of the art" which means there is a large safety margin and that we= are carrying a lot of weight to give us that margin of safety.

CPD (Composite Polymer Designs) and Applied Poleramic have a lot of dif= ferent toughened formulations.

Dan

Dan

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