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WARNING! Do not use UV drier with acrylic molds!

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I had custom acrylic earmolds made for my 105db Oticon receivers in May '24. I have been using my UV drier once in several days to get rid of the moisture. Two weeks ago I noticed that there was a large crack on my left earmold. Today, after the drying session I noticed that the left earmold’s crack has expanded and a tiny crack has appeared on my right earmold. Apparently UV makes acrylic brittle. While my earmolds are still usable, I suspect that I will have to order new acrylic earmolds in a month or so if I continue using my UV drier.

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Yes I found it also damages soft ear moulds by making them really hard.

I wear Aids so I can disconnect my ear moulds / tubing at the ear hook.

I’ve got a crack too and I didn’t know how it happened…. Now I suspect it might have been the dryer…

Thanks for the heads up!

By the way: by acrylic, you mean the transparent plastic?

How long does your dryer keep the UV on? The Dry and Store Global II uses UV only for the first 90 seconds of the 8-hour drying cycle.

In older threads many thought the UV was not harmful. Are you sure the molds did not crack for some other reason? Do they have a thin area and cracked there?

I have been using dryer, with UV, on molds for over 5 years. Usually 2 times a week unless I get caught in the rain or sweat a lot. Never seen a crack. Maybe heat versus the UV? I am suspicious of the heat affecting the coating on the receiver wires, but they have always lasted at least 3 years.

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