What is PPR steel-plastic pipe and what is the difference between PPR pipe and PPR pipe

What is PPR steel-plastic pipe and what is the difference between PPR pipe and PPR pipe.

The difference between PPR steel-plastic pipe and PPr pipe is that PPR steel-plastic pipe is steel pipe and PPR pipe is plastic pipe.

Steel-plastic composite pipe, seamless steel pipe, welded steel pipe as the base pipe, the inner wall coated with high adhesion, anti-corrosion, food-grade sanitary polyethylene powder coatings or epoxy resin coatings. Zinc-coated and plastic-coated composite steel pipes for water supply are made by pretreatment, preheating, internal coating, leveling and post-treatment processes. They are upgraded products of traditional zinc-coated pipes. Steel-plastic composite pipes are generally connected by threads.