1 year ago
Last edited at 7:50PM on 6/22/2012
Nope, plastic is gas permeable. Most plastics will shrink when heat treated and will not stay sealed. Hard plastics usually have BHT in them and heat will make it leach into the food. It is becoming less common in commercial food containers but it is still around. New glass jars are expensive but check at your local thrift stores and yard sales. Sometimes you can find them for cheap. Always use new rings and lids.