What does the triangle mark on the bottom of the plastic lunch box and the number in the middle mean?
The triangular mark on the bottom of the plastic product is equivalent to the "ID card" of the product. The triangle formed by three arrows means "recyclable". In addition, the numbers inside the triangle, such as "1", are digital signs. Plastic number signs are from 1 to 7, each number represents a plastic material, mainly to facilitate recycling and understand its use conditions.
The bottom mark of the plastic lunch box is the environmental protection recycling mark, the number of which ranges from 1 to 7, and the specific meaning is:
1: PET (polyethylene terephthalate), the container made of this material is a common plastic bottle for soda, also commonly known as "Pote bottle"
2: HDPE (High Density Polyethylene), containers for detergents, shampoos, shower gels, edible oils, pesticides, etc. are mostly made of HDPE. The container is mostly opaque and feels like wax.
3: PVC (polyvinyl chloride), which is mostly used to make water pipes, raincoats, school bags, building materials, plastic films, plastic boxes and other utensils.
4: LDPE (low density polyethylene), plastic bags that can be seen everywhere are mostly made of LDPE.
5: PP (polypropylene), mostly used to make buckets, trash cans, baskets, baskets and food containers for microwave ovens, etc.
6: PS (polystyrene), due to its low water absorption, is mostly used to manufacture building materials, toys, stationery, rollers, as well as cup boxes or disposable tableware for beverages in fast food restaurants.
7: Other. PC is an abbreviation for Polycarbonate.
Among them, the reuse marked "5" indicates that its main manufacturing material is pp. The plastic container made of this material has good air permeability, high heat resistance and high impact resistance, strong mechanical properties, and resistance to various organic solvents and acid and alkali corrosion. It is mostly used in plastic containers such as microwave lunch boxes and milk bottles. Plastic containers made of pp material are microwave safe and can be reused after careful cleaning. However, some microwave lunch boxes are made of No. 5 pp, but the lid is made of No. 1 PE, so they cannot be put into the microwave oven together with the box.
