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Old 24-10-2012, 18:36   #1
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High temperature - which resin type

Question: does Polyester resin withstand hot temperatures better than Epoxy resin?

I have an application where fibreglass will be in contact with a hot pipe (probably around 212F or 100Celcius).

I know you get speciality epoxy sticks that can handle higher temperatures, but I'm wondering whether stock standard polyester resin handles heat better than epoxy resin?

And secondly, also wondering whether cycling such resin (polyester or epoxy) through heating-cooling cycles affects its adhesion or strength significantly.
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Old 24-10-2012, 18:47   #2
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Re: High temperature - which resin type

i would say neither,and definitely not polyester resin.

epoxy if you must, us a resin formulated with the correct filler in it for high tempreture,

high tempreture silicon would be a better choice due to its abilities to expand and contract.
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Old 25-10-2012, 01:18   #3
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Re: High temperature - which resin type

System Three Silver Tip laminating resin is the only laminating resin I have found which claims to have a higher resistance to heat. I have used both it and WEST with fire retardant additive for laminating engine exhausts many times, both have done well. Silver Tip is of course much easier to laminate with due to viscosity. There are of course limits though. 212 is pretty hot long term.


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Old 25-10-2012, 02:24   #4
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Re: High temperature - which resin type

There ARE aerospace resins that can withstand up to 1500 F constantly. But I doubt you would be wanting to pay around $3000 a litre.

For the typical boat resin, I would say niether, can you cast a firebrick cement collar around the pipe and bond the resin to the outer surface of the insulating collar?
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Old 25-10-2012, 03:04   #5
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Re: High temperature - which resin type

Vinyl ester resin is high temp....use it on exhaust tubes.....Ed
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Old 29-10-2012, 22:05   #6
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Re: High temperature - which resin type

Thanks gents, for all your good ideas. In the end, time pressure forced me to buy what was on shelf at my nearby auto-shop - epoxy putty stick called "Quicksteel". Made in USA and specification says 500F continuous operating temperature. Small stick so I needed to buy a few of them but at least no stoppage on the job.
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