[PSUBS-MAILIST] Emer Buoy brake and clear resin

[Sean T. Stevenson via Personal_Submersibles]

Jon - I wonder if you have any way of measuring the in-service temperature of the operating LED when potted (IR thermometer)? Does the resin you are using have a temperature specification?

For reference, the MG Chemicals 832WC (water clear epoxy potting and encapsulating compound) product that I suggested earlier indicates the following:

"This product is designed for applications where high clarity is required. It does not yellow when exposed to UV light; it maintains clarity in applications with service temperatures of up to 65 °C (149 °F) and intermittent exposures of up to 100 °C (212 °F). It can be used for underwater applications such as swimming pool light [potting compound](https://mgchemicals.com/category/potting-compounds/). It is also a good choice for casting resin.

This casting epoxy also provides excellent electrical insulation and protects circuit boards and other electronic devices from static discharge, vibration, abrasion, thermal shock, environmental humidity, salt water, fungus, and many harsh chemicals."

...which seems to suggest that if a potted assembly can keep under 65°C / 149°F while submerged, there should be no issue with breakdown of the epoxy (for that particular epoxy).

Are you able even to ballpark how hot it was getting? The threshold for too hot to handle continuously with a bare hand is about 44°C / 111°F, so 65°C is warmer than you think.

Sean

On Friday, February 21st, 2025 at 17:43, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

> Just finished testing a second LED light which I filled with epoxy only enough to cover the diodes and other electronics. My light meter shows a 10% output increase over the fully filled unit, however to my eye the two appear almost exactly the same. Both units utilize the reflectors that came with them.
>
> Here's the link again to the brand/model I have tested.
> https://tigerlights.com/products/50w-compact-led-flood-light-generation-2-tl500f/
>
> Jon
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