Which plastic food containers are safe to reuse?

Not all plastic food containers are suitable for reuse. The key factors are the material's heat resistance, chemical stability, and ease of cleaning. Here is an analysis of the main reusable materials:

1. Polypropylene (PP, Plastic Grade 5)

Polypropylene is currently the most recommended plastic material for reuse. It has extremely high heat resistance (typically above 120°C), strong acid and alkali resistance, and a dense structure that does not easily absorb food grease and odors. It is commonly used in microwave-safe food containers and coffee cups.

Safety: PP does not release harmful substances at high temperatures and has good durability, making it widely used in baby bottles, microwave-safe food containers, and other applications where food comes into prolonged contact.

Suitable Applications: Microwave heating, holding hot soup or fried foods.

2. High-Density Polyethylene (HDPE, Plastic Grade 2)

High-density polyethylene has excellent chemical stability and impact resistance. It is commonly used to make milk bottles, shampoo bottles, and thicker food storage containers.

Safety: HDPE has strong resistance to acids, alkalis, and oils, and is commonly used for packaging edible oils due to its high safety profile.

Suitable Scenarios: Dry goods and refrigerated food storage.

3. Polyethylene Terephthalate (PET, Plastic No. 1)

PET is widely used in beverage bottles and yogurt cups due to its high transparency and good barrier properties. Although PET is extremely common in food packaging, its safety is relatively poor in terms of reusability.

Safety: PET containers are usually designed for single use. Prolonged exposure to heat (such as microwave heating) or repeated use may slowly release trace amounts of ethylene glycol and other degradation products, posing a potential health risk.

Suitable Scenarios: Packaging for cold drinks, yogurt, and other short-term consumption items.

4. Other Materials (PC, PVC, etc.)

Polycarbonate (PC, No. 7): Extremely impact-resistant, but may contain bisphenol A (BPA), posing a potential health risk at high temperatures; careful selection is advised.

Polyvinyl chloride (PVC): Generally not recommended for food storage, especially high-fat foods, as PVC may release harmful plasticizers at high temperatures.