OK according to some references on the internet. "<span class="st">Use metal cans when storing diethyl ethers. The Iron in the container inhibits the formation of peroxides." But you can use small plastic containers say less than 2 to 4 ounces for immediate usage though. Peroxide crystals forming on and around the filler cap become quite explosive when disturbed.
So that explains why everyone is using metal cans then. Also avoid freezing the container of ether as it can cause peroxides to precipitate out of the solution too. But if the ether is mixed with oil and kerosene then this shouldn't happen so easily.

ref:
</span><span class="st">http://</span><span class="st">www.marshall.edu/safety/chemical/</span><span class="st">management_of_peroxide-forming_chemicals.pdf</span>
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