[China Packaging Network News] The plastic recycling symbol acts like an ID card for plastic packaging. A small triangle with a number inside is typically found on the bottom of plastic containers. These numbers, ranging from 1 to 7, represent different types of plastics, each with its own characteristics and safety considerations.
"01" should not be reused after drinking
Number 1 represents PET (polyethylene terephthalate), commonly used in bottles for soft drinks, mineral water, and other beverages. It’s not suitable for hot liquids or repeated use, as it can deform when exposed to heat and may release harmful substances over time. Studies have shown that after more than 10 months of use, PET may even release carcinogens. Therefore, it's best to discard these bottles after one-time use rather than reusing them as cups or storage containers.
"02" is not ideal for water storage
Number 2 stands for HDPE (high-density polyethylene), often used in cleaning product bottles, milk jugs, and shopping bags. While it can withstand higher temperatures up to 110°C, it's not recommended for long-term food storage. Even if cleaned, residues can remain, creating a breeding ground for bacteria. For example, some large bottles of Nongfu Spring are marked with 02, but they shouldn't be used as water storage containers due to potential long-term risks.
"03" should never be heated
Number 3 refers to PVC (polyvinyl chloride), often found in raincoats and plastic wraps. This material can release toxic chemicals like vinyl chloride and plasticizers, especially when exposed to heat or fats. These substances can be harmful to health, which is why PVC is rarely used for food packaging. If you come across it, avoid heating it at all costs.
"04" melts at high temperatures
Number 4 is LDPE (low-density polyethylene), commonly used for cling wrap and food packaging films. However, it has poor heat resistance and can melt above 110°C. When used to wrap food and then heated, harmful chemicals from the film can leach into the food, posing a health risk.
"05" is safe for microwave use
Number 5 is PP (polypropylene), the only plastic that can safely be used in microwave ovens. It’s often used for microwave meal boxes, as it can withstand temperatures up to 130°C. While it’s reusable after thorough cleaning, some microwave containers have lids made from PS (number 6), which cannot be heated. Always remove the lid before microwaving.
"06" should not be heated directly
Number 6 is PS (polystyrene), commonly used for disposable bowls and snack containers. It can break down when exposed to acidic or alkaline substances, releasing potentially harmful chemicals. Although it's resistant to cold, it shouldn’t be used in the microwave, as high heat can cause it to release toxins.
"07" needs careful handling to avoid BPA
Number 7 includes PC (polycarbonate) and other materials, often used in baby bottles and water bottles. These products may contain bisphenol A (BPA), a substance linked to health issues. While manufacturers aim to fully polymerize BPA during production, there's no guarantee. To reduce exposure, avoid heating these containers, don’t expose them to sunlight, and clean them manually instead of using dishwashers. If damaged, stop using them immediately.
Expert Advice
Many people reuse plastic bottles for convenience, believing it’s eco-friendly. However, most beverage bottles are made of PET, which is designed for single-use. Reusing them can lead to chemical leaching, especially when storing oily or alcoholic substances. Experts recommend using glass or stainless steel containers for safer, long-term use.
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