When purchasing plastic disposable tableware, it is necessary to see clearly whether there is a "QS" sign, number and manufacturer on the smallest unit package; See if the surface of tableware is smooth, and don't buy rough and different colors; Observe whether the thickness of the product is uniform; Product color should be comfortable, try to choose colorless, odorless, transparent and non-decorative tableware; You can choose products marked with PE (polyethylene) and PP (polypropylene). When selecting paper disposable tableware, it is necessary to check whether the outer packaging is sealed, whether the "QS" logo and number, the name, address and production date of the manufacturer are marked on the smallest packaging unit, and you can also pinch the paper cups and tableware by hand to observe whether the hardness is enough; Unqualified paper cups can smell strange smell as soon as they are opened, and the cups are soft and easy to deform when poured into water. Some paper cups are poorly sealed, and the bottom of the cup is easy to seep. If you gently touch the inside of the paper cup with your hand, you will feel fine powder on it and the touch of your fingers will turn white, which is a typical inferior paper cup.