What's the number on the bottom of the plastic bottle

1. PET (Polyethylene Terephthalate): Commonly found in mineral water bottles and carbonated drink bottles, PET is heat-resistant up to 70°C but can easily deform at high temperatures. With prolonged use, it may release DEHP, a potential carcinogen. It is not recommended to reuse PET containers, especially in hot environments or for storing substances like alcohol or oil.

2. HDPE (High-Density Polyethylene): This material is widely used in detergent, shampoo, body wash, and oil bottles. HDPE containers are usually opaque and have a waxy texture. While durable, they are not recommended for reuse as drinking containers, as improper cleaning may leave harmful residues.

3. PVC (Polyvinyl Chloride): Found in pipes, raincoats, backpacks, and plastic films, PVC has excellent plasticity and is inexpensive. However, it can only withstand temperatures up to 81°C. At higher temperatures, harmful substances may be released. PVC is rarely used in food packaging because it is difficult to clean and can leave chemical residues, making it unsafe for contact with food.

4. LDPE (Low-Density Polyethylene): LDPE is commonly used in plastic wrap and bags. While it provides good moisture resistance, harmful substances can be released at high temperatures, which may lead to health issues. It's important to avoid using LDPE plastic wrap in the microwave or in high-heat situations.
5. PP (Polypropylene): Used in microwave food containers, soy milk bottles, yogurt bottles, and juice bottles, PP is heat-resistant up to 167°C. It is the only plastic suitable for microwave use, and it can be reused after careful cleaning. However, some microwave containers have lids made from LDPE (code 4), which should not be microwaved together with the PP container.
6. PS (Polystyrene): Found in instant noodle cups, fast-food containers, and disposable drink cups, PS is lightweight and durable but releases carcinogenic substances when in contact with acidic or alkaline substances, or when exposed to high heat. It is not safe for use in microwaves or with hot or acidic foods.

7. Other (PC, PLA, etc.): PC (Polycarbonate) is often used in baby bottles and reusable water containers. However, at high temperatures, PC can release Bisphenol A (BPA), a toxic substance. It is important to avoid heating or exposing such containers to sunlight, particularly for products used by infants.

lastics labeled with codes 3, 6, and 7 should be used with caution and never repeatedly heated.

Code 2 containers, though reusable after cleaning, are difficult to clean thoroughly and can harbor bacteria, so it’s best not to reuse them. Code 5 plastics are safe for microwave use, but always check for the "5" symbol on the bottom of microwave-safe containers.

Code 1 bottles, like common mineral water bottles, are heat-sensitive and should not be reused for holding hot liquids, as harmful substances may be released.