plastic foundatin

Does anyone know what type of plastic is being used by companies like Ritecell, Pierco and Plasticell to produce their plastic foundation. Also does the plastic leech into the wax?

We use primarily plastic frames or foundation. I am always in a discussion with people on the pro and cons on plastic foundation or frames. Even though we use the plastic frames on some of the hives, my first choice is wood frames and plastic foundation. The reason is that if a plastic frame...