Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Sat, 02 Oct 2004 22:58:58 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 450699 for lml@lancaironline.net; Sat, 02 Oct 2004 16:43:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=Newlan2dl@aol.com Received: from Newlan2dl@aol.com by imo-m25.mx.aol.com (mail_out_v37_r3.7.) id q.193.2f75bdcc (4584) for ; Sat, 2 Oct 2004 16:43:15 -0400 (EDT) From: Newlan2dl@aol.com X-Original-Message-ID: <193.2f75bdcc.2e906ce2@aol.com> X-Original-Date: Sat, 2 Oct 2004 16:43:14 EDT Subject: surface preparation for bonding X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1096749794" X-Mailer: 9.0 for Windows sub 5032 -------------------------------1096749794 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit After checking in my reference books, I went to the Hysol website and read what they had posted for their surface preparation prior to bonding. For our thermoset composites, they said basically the same thing as the ASM book did, i.e. 1. Degrease before sanding using either MEK or acetone 2. Mechanically abrade the surfaces to be bonded 3. Repeat degreasing with acetone or MEK As I said before, the means of contaminate removal isn't all that important, only that it must be clean. A freshly abraded surface is great to bond to but suffers from dust in the bondline and that is the sole purpose of solvent wiping. A 100% pure solvent evaporates leaving behind no contaminates, hence my concern about hardware store acetone. Just use it for cleaning brushes and tools and you're fine but it's better not to use it for cleaning prior to bonding. Technical grade acetone is a fairly pure acetone and easily available from chemical supply houses. Analytical grade is better but somewhere around $150/gallon as I remember and the results doubtful as to how superior over technical grade. And while you are at it, order some "Kimwipes" since these are better than paper towels. They are tougher, cleaner, don't "pill" into little fiber balls, are designed to withstand chemicals and not release contaminates. Dan -------------------------------1096749794 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

After checking in my reference books, I went to the Hysol website and r= ead what they had posted for their surface preparation prior to bonding.&nbs= p; For our thermoset composites, they said basically the same thing as the A= SM book did, i.e.

1. Degrease before sanding using either MEK or aceton= e

2. Mechanically abrade the surfaces to be bonded

3. Repeat degreasing with acetone or MEK

As I said before, the means of contaminate removal isn't all that impor= tant, only that it must be clean. A freshly abraded surface is great t= o bond to but suffers from dust in the bondline and that is the sole purpose= of solvent wiping. A 100% pure solvent evaporates leaving behind no c= ontaminates, hence my concern about hardware store acetone. Just use i= t for cleaning brushes and tools and you're fine but it's better not to use=20= it for cleaning prior to bonding. Technical grade acetone is a fairly pure a= cetone and easily available from chemical supply houses. Analytical gr= ade is better but somewhere around $150/gallon as I remember and the results= doubtful as to how superior over technical grade. And while you are a= t it, order some "Kimwipes" since these are better than paper towe= ls. They are tougher, cleaner, don't "pill" into little fiber balls, a= re designed to withstand chemicals and not release contaminates.

Dan

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