Cup precautions

The most commonly used cup in daily life is a water cup, but there are various types of cups. In terms of cup materials, common ones include glass cups, enamel cups, ceramic cups, plastic cups, stainless steel cups, paper cups, insulation cups, health cups, etc. How to choose a safe drinking cup that is suitable for drinking.
1. Plastic cup: Choose edible grade plastic
Plastic cups are loved by many people due to their versatile shapes, bright colors, and fearless nature, making them very suitable for outdoor users and office workers. Generally speaking, the bottom of plastic cups is marked with a number on the small triangle, commonly known as "05", indicating that the material of the cup is PP (polypropylene). The PP material cup has good heat resistance, melting point between 170 ℃ and 172 ℃, and chemical properties are also relatively stable. Apart from being corroded by concentrated sulfuric acid and concentrated nitric acid, it is also relatively stable to various other chemical reagents. But the problem with ordinary plastic cups is quite common. Plastic belongs to polymer chemical materials. When using plastic cups to hold hot water or boiling water, the polymer is easily precipitated and dissolved in water, which is harmful to human health after consumption. Moreover, the internal microstructure of plastic has many pores, which hide dirt and can breed bacteria if not cleaned thoroughly. So choosing a plastic cup is very important for the selection of plastic materials, and it is necessary to choose food grade plastic that meets national standards. It is made of PP material.