I've read here and other places that HDPE and PP5 are the only two plastics one should use to mix lye in, and I agree totally, but I've also read that HDPE is the only one to use for storing a lye/water mix that is not going to be used right away (as in masterbatching).
Thanks for the links, Nevada - lots of good info there.
Thanks for the links, Nevada - lots of good info there.