Provides good chemical resistance and meets FDA regulations for food contact.I think all 3 are good for low temp food grade applications, PTFE is expensive, Polyethylene is mostly black, Polypropylene is all white, choice?Decision, Joint Thickness, bigger is better as stiffer so bend less and for me I would lose less curds out side.Decision, Strand thickness, bigger is better as stiffer, but if less t