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Soduim hydroxide container? Answered

Is it safe to keep sodium hydroxide (NaOH) in a glass container or is PYREX necessary for safety? 



Best Answer 6 years ago

Sodium hydroxide should NOT be stored in glass.  Do not use polyethylene terephthalate (aka PET or PETE) type plastic either which is probably the most common household plastic (water bottles, etc).

I use high-density polyethylene (aka HDPE) or polypropylene (aka PP) which are somewhat common around the house.  Other plastics work too but you will have to look at its chemical resistance chart, not all plastics will work.  The sodium hydroxide I have came in a #2 HDPE bottle.

Certain metal containers are OK but I tend to avoid metal because there are so many different compositions and chemicals that can't be stored in or even near any kind of metal container.

As mentioned, use an airtight container because it is extremely hygroscopic.


lye can also be safely stored in certain types of plastics so long as they are air tight.

Lye can be safely stored in a clean glass container (Pyrex only protectsagainst heat).  Just make certain it is sealed properly with anon-metallic lid, and is well marked and in a place where the jar willnot be accidentally broken.  BE CAREFUL.