PET material has toughness, bright color and simple manufacture. Food-grade PET is non-toxic and can be used to hold food, drinks and pills. For example, Zhejiang Zhenhua PET bottle. Barreled peanut oil and mineral water drinks in supermarkets are basically made of this material. The country has strict standards for pet materials used in food. The disadvantage is that PET material is not resistant to high temperature, which may cause toxic substances to melt out at high temperature. If the bulk food is hot when it is made, HDPE is recommended.
HDPE material is white and translucent, acid and alkali resistant, good toughness, and high temperature resistant compared with PET material. Food-grade HDPE has bright colors and waxy luster on the surface, which can be used to hold food. For example, Linyi Xinlanxiang food barrel. In the supermarket, all the 4L vats of Nongfu Spring are HDPE bottles. Generally, peanut oil in bulk is hot when it comes out, so it is safer to use HDPE plastic barrels. The disadvantage is that it is not suitable for thorough cleaning after long-term use.
Whether it is made of PET or HDPE, as long as it is used for food, you must buy food-grade products in formal channels.