by CH3CH2OH » Thu Nov 27, 2014 3:14 am
I am anal when it comes to plastics and avoid everything but EPDM, teflon (not very compressable for bottles/jars), silicone or natural cork - NOT MANUFACTURED CORK- for spirits
You can buy a big bag of bulk natural corks for pretty cheap, why take the risk. Vapours can cause deterioration and leeching albeit slower than immersion, I don't chance it personally.