It seems to me that a canning pressure cooker would do a faster and better job of sterilizing than an oven. up to 250 + degrees F at twenty pounds pressure. A

It seems to me that a canning pressure cooker would do a faster and better job of sterilizing than an oven. up to 250 + degrees F at twenty pounds pressure. Available at most hardware stores, home depot, fleet farm etc. 22qt size would do a lot of masks