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
>>
>>
>
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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