High Temp Epoxy Glue/Sealant info please

[Bertie Doe]

I wonder if anyone can help. I'm looking for a high temp 90C epoxy sealant. It will also be subject to water pressure of 130 psi.

Araldite Precision comes in a handy size of 2 x 15ml tubes, but it's max heat resistance is only 65C.

The application I'm using it for, is placing a s/steel sheathed K type thermocouple into a coffee portafilter, similar to this one made in the States.

epoxy (or something similar) doesn't have to be food-safe, as I'm using a spare portafilter, solely for occasional temperature measurement, thanks.

Bertie

[nightjar]

Araldite 2015 is rated to 120C. Some of the heat assisted cure epoxies probably go higher than that.

Colin Bignell

[Bob Minchin]

Have look at high temperature silicones. I think the glass doors in some oven are held in with this stuff. Maybe RS carry something? RSWWW.com

Bob

[Grunff]

High temperature silicone, such as:

[meow2222]

Beware of these temp ratings. IME epoxy with highish temp rating was utterly useless when subjected to boiling water. It may have survived, but only as a soft squishy useless mess.

NT

[nightjar]

We used a room temperature setting Araldite rated at 150C for assembling medical devices and it was perfectly happy being autoclaved in steam at

135C. However, the Araldite range has been renamed since then and I don't know which one is the current equivalent.

Colin Bignell

[Bertie Doe]

"nightjar .me.uk>" >

Meow, yep I didn't read the instructions on the Araldite 65 and it's a mess. Thanks Colin, if I could track down the rebadged Araldite 150C

Thanks Bob and Grunff, I hadn't given silicone a thought, assuming the rubber wouldn't stand up to 135 psi. That's a handy link Grunff, the Galva Mate Grey looks like it may do the job.

Bertie

[Stephen Howard]

In case it's of any help, I filled a cracked Rayburn flue ( just above the air valve on top on the stove ) with JB Weld - it's still holding up after many years. I'd imagine the temperature of the flue at that point exceeds your requirements.

Regards,

[Bertie Doe]

I tracked down Araldite 2014 - 1 high temperature, but the cost is £11.44 + vat + £6 p&p and a minimum order of £30. Thanks Stephen, the JB Weld spec seems too good to be true,

it may even have the edge over the silicone or the Galva Mate Grey. I'm being spoilt for choice.

Bertie

[Stephen Howard]

I've never read the JB specs - it was originally recommended to me by a car mechanic when I needed a cheap solution for a frostbitten Land Rover engine with a cracked engine block. Drained the core, dried the crack, shoved in a wadge of JB Weld and never had a problem with it for the rest of the engine's life.

I should think it's cheap enough to be able to grab a packet and try it out on a test piece. Stick a dollop on an old bolt or something, let it cure for a couple of days then boil it up for a couple of hours to see what happens!

Regards,

[Bertie Doe]

the following specs 500F (260C) and waterproof, it should do the job.

[Bertie Doe]

I'll update.

Bertie

[Bertie Doe]

Got a reply from JB Weld, confirming that it will bond to stainless. To play safe, I've roughened up all stainless surfaces with some fine Wet & Dry and it's looking good. I'll give it another 12 hours to cure and test tomorrow.

Bertie