Copper tubing to be exact. I have a couple rolled lengths of soft copper tube. One length is about 20 years old and the other about 4 years old. Both are the soft copper tubing commonly used for refrigeration or water. It comes with a plastic cap on each end. Anyway, my old rolled length, which I discovered the other day when cleaning out some junk, is much stiffer than the new roll. So I am wondering if the copper got stiffer over time because the older stuff is quite a bit harder to bend than the newer stuff. Eric
- posted
8 years ago