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Date:         Sun, 22 Dec 2013 14:33:26 -0600
Reply-To:     Max Wellhouse <dimwittedmoose@CFU.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Max Wellhouse <dimwittedmoose@CFU.NET>
Subject:      Re: Syncro Gas/FuelTank material
Comments: To: Karl <tdiguru@WESTYVENTURES.COM>
In-Reply-To:  <52B7277C.5040001@westyventures.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

On 12/22/2013 11:55 AM, Karl wrote: > The Syncro tank, as mentioned, is polyethylene. Almost all plastic fuel > tanks are made of this type. > > On 12/22/2013 12:49 PM, OlRivrRat wrote: >> Thanks much for the GreatInfo Karl ~ I wonder where that Symbol >> might be hiding on a SyncroGasTank >> >> ORR ~ DeanB >> >> >> On 21 Dec , 2013, at 9:58 PM, Karl Mullendore wrote: >> >>> http://www.northwestpolymers.ca/plasticid.html >>> >>> http://www.bestmaterials.com/PDF_Files/BAK-Plastic-Welding2.pdf >>> >>> http://www.urethanesupply.com/identify.php >> >> > > --- > This email is free from viruses and malware because avast! Antivirus > protection is active. > http://www.avast.com Unfortuneately, saying"polyethylene' is like saying "paper towl". There are many formulaitons of that breed of plastic, and each one accepts or rejects repairs in their own unique way. Even the newer plastic items with the recycle logos that say LDPE HDPE etc aren't specific nough for a permanent repair to be guaranteed. The older triple crosslinked polythylene kayaks were very tough brutes as far as abrasion and impact absorption, but eventually the sun would eat them up and when they cracked, virtually nothing would repair them. Not even sure today's G-flex wold work. Linear Polyethylene is much more repairman-friendly and at least accepts welding better. Prolly have to use G-Flex or some urethane based resin system that requires the passing of the blue cone of a propane torch flame to "polarize" the plastic prior to bonding...not sure that's a plus if you're working on a gas tank. ABS plastic can have success by taking a piepce of ABS plastic pipe and and a Shure form rasp and shaving it down so you have a big nest of plastic shards. Mixing the shards with some acetone will melt the shards into a putty that bonds well to properly prepped ABS substrate.

I bought a portable hot air plastic welder 20 years ago to try and weld broken kayaks back together and never was any good at it. Sold it to someone on ebay and took a huge loss on it.

Bottom line is that Ken's used Syncro tank is sounding better all the time.....lol

YMMV

DM&FS


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