Contrabasso
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"Pellets" in NM
I've just come by some nitromethane - it's a part full Aldrich bottle, not full 
However there are pellets in the bottom -lots of them. I'm hoping that they are for keeping it dry, but what would you think they are they look 2mm
dia 6 mm long cylinders that sound hard against the bottle and look grey. I'm wondering if they would likely be sodium metal or some kind of other
absorbant.
While I realise that you can't see the pellets, wise guesses would be appreciated, as would certain fact that "Aldrich always insert ..... into NM"
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Picric-A
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Most certainly from your description they are molecular sieves, used to keep the NM dry.
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itchyfruit
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Had a quick look on sigma's site and it appears that it is sold over 'molecular sieves' to keep H2O below 0.01%
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