Well, that's confusing.
SDS sheets are commonly 'rough justice', with numbers rounded off to whole units and bracketed quantities. The SDS is for shipping and handling
hazards, not for evaluating purity or application suitability. I commonly see things like a 70% mix listed as "50-90%" on its SDS. So, I wouldn't
get too hung up on that.
The specification is certainly badly written. I would interpret it as 3-5% methanol with the REMAINDER of the volume being 99.9% ethanol. Which is
probably fine if you're looking for a solvent, but is likely undesirable for a reagent since it will increase the amount of side products (though
perhaps not by an unacceptable level, depending on what you're making.)
My assumption would be that the methanol content is on the high side of their range, ie. 5% since methanol is usually cheaper than ethanol.
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