https://www.cmncompressor.com/oil-free-screw-and-scroll-air-compressor-for-pet-blowing.html The raw materials of plastic bottles must meet relevant national standards, especially medicinal bottles must meet medical and health requirements. There are four common raw materials for plastic bottles, polypropylene (PP), polyester (PET), polystyrene (PS), polyethylene (PE), etc. With PET compressed air, the materials are made into different forms of bottle containers.All Rights Reserved