A Guide to Proper Daily Plastic Use – Eliminate Common Safety Misconceptions

Potential safety risks from plastic products rarely stem from substandard raw materials, but rather widespread improper usage habits among the public. Many households reuse beverage bottles long-term, heat plastic tableware arbitrarily or continue using aged plastic goods past their service life, which may gradually compromise safety over time. Mastering scientific plastic usage methods balances convenience and physical health.

First, strictly distinguish single-use and reusable plastic items. No.1 beverage bottles, No.6 disposable food containers and thin regular fresh-keeping bags are engineered for short-term single use with weak resistance to aging and repeated washing. Reusing them wears down inner surfaces to form tiny gaps that trap food residue and breed bacteria. Long-term storage of hot and cold liquids accelerates material aging and harmful substance leaching, so replace them after one use.

Second, adhere strictly to temperature limits and avoid overheating. Every plastic type has a fixed maximum heat tolerance and must not be heated beyond this threshold. Only containers marked No.5 PP can be used in microwaves or filled with boiling water; No.2 and No.4 plastics are only suitable for room-temperature or refrigerated storage. No.1, No.3 and No.6 plastics cannot withstand high temperatures at all and must never touch hot water, open flames or high-temperature cookware to eliminate safety hazards.

Third, store different items separately to avoid chemical corrosion. Plastics have limited corrosion resistance and will age, turn brittle and deteriorate under prolonged contact with strong acids, alkalis and high-fat substances. Avoid storing vinegar, soy sauce, chili oil, alcohol and cleaning agents in ordinary plastic containers long-term. Glass and ceramic vessels are preferred for condiments and corrosive liquids, while plastic containers are only recommended for holding clean water, dry goods and snacks.

Fourth, replace aged plastic products regularly. All plastics have a limited service life. Prolonged use leads to yellowing, whitening, scratches, cracks and deformation—clear signs of aging. Aged plastics lose structural integrity and stability, easily trapping dirt and bacteria. Replace household plastic water cups, storage boxes and kitchenware every one to two years, and discard any items showing damage, strange odors or discoloration immediately.

Finally, adopt refined plastic usage for sensitive groups. Infants and pregnant women have delicate constitutions. When purchasing tableware, water cups and toys, prioritize odorless, transparent, formally tested No.5 PP and food-grade plastic products, and reject unbranded inferior colored plastic goods to maximize usage safety.