I am a retired chemist and used very strong concentrations of hydrogen peroxide.

I bought some teeth whitener that uses hydrogen peroxide in a high percentage.

I was not happy with the results.

I noticed that it ate the rubber in the syringe where it was stored.

So, I started freezing the ones I was not using.

I decided to try to salvage it by washing out the H2O3 and using the syringe.

I found that the rubber on the syringe had "melted."

That, to me was scary.

Do you think the rubber was of low quality?

Andy