Yeah certain solvents will break down stoppers a lot faster than others. Here is a chart that may be useful to the blokes looking for filters/stoppers etc for homebrewing . Syringe Filters Solvent Compatibility ChartWait. Jokes aside- can some solvents actually break down the rubber stopper? Because now I'm concerned as I don't store my vials upright, they're all kinda thrown into a big ziplock bag.
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