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Vic11/05/2019 11:04:17
3089 forum posts
16 photos

As this forum is the font of all knowledge cheeky I wonder if anyone can supply an answer to my query. Why is it that when I buy 5 Litres of H2O2 at 12% from the auction site it comes in a clear plastic container but if I buy a 3% solution from the chemist it comes in a brown bottle? I also note from YouTube videos it regularly seems to be supplied in black bottles in the USA. Just wondered. smiley

pgk pgk11/05/2019 11:22:28
2591 forum posts
293 photos

I'm not aware of any absolute regulation re medicine bottles having to be amber although fluted does denote poison. Nevertheless i suspect the reason is that your bulk purchase is for dispensing and the 3% small bottle is sold as medicine. We used to buy 20 vol h202 in bulk and as your experience that came in clear plastic but any dispensing bottles we bought always came amber glass. Having said that many liquid medicines from manufacturers prepackaged for dispensing did come in clear just to confuse the issue.
Obviously the amber protects against UV so there may be an element of expectation that some medicines will lurk around being used over a long period whereas others get finished in short order (or dispensed promptly and stored better)


Graham Stoppani11/05/2019 11:23:58
126 forum posts
26 photos

This may be your answer.

" White chemical porcelain and borosilicate glass are both compatible with hydrogen peroxide and are widely used for small scale laboratory apparatus. Due to the risk of breakage, these materials are not generally recommended for large scale apparatus or plants."

taken from


Robert Atkinson 211/05/2019 11:41:01
1238 forum posts
20 photos

Light, particuarly the shorter wavelengths, will speed the decomposition of hydrogen peroxide so it should ideally be stored in opaque or light filtering containers. The online sellers are being cheap. If kept in a dark place it makes no difference.

Robert G8RPI.

Vic12/05/2019 11:32:52
3089 forum posts
16 photos

I keep the five litre containers in a dark cupboard so it should be ok.

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