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Heat limits of J-B weld expoxy?

how to fix a broken pot handle

How much heat can J-B Weld's Quick-Setting steel reinforced epoxy take?

I fixed this pot handle recently and it's been holding up well under average cooking temperatures.

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According to the website, up to 300 °F (150 °C).

Keep in mind though that bond strength also depends to a large degree on the substrate and on the surface preparation. An adhesive cannot be suited for all substrates.

Panhandles are often made out of melamine or other thermosetting resins which should bond pretty well with epoxy. Some thermoplastics (especially PE) won't bond at all without a primer.

The standard mantra for proper bonding is "first degrease the bond surfaces, then sand the bond surfaces, degrease them again, bond".

While thermosetting resins such as this epoxy cannot melt, but they have what is called a glass transition temperature ("Tg"). This is a temperature (range) where the behavior changes from hard and brittle to soft and rubbery. At an even higher temperature thermosets will degrade. In normal use you should stay at least 30 °C below the Tg.

Unfortunately the website doesn't tell which limit the 300 °F represents. But I assume it is the maximum normal use temperature. Keep in mind that while a pan filled with water cannot be hotter than the boiling point of water, an empty pan or a pan filled with oil can become a lot hotter than 300 °F!

Comment by Roland_Smith Sat May 10 18:43:59 2014

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