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Labels on Microwave-Safe Plastic Food Containers
In recent years, with rising living costs, more and more office workers have started bringing lunch from home, which has boosted the demand for microwave-safe plastic food containers. However, the plasticizer scandal has put a damper on this trend. Plasticizers, also known as phthalates, are toxic substances harmful to the human body.
They can be released when plastic is heated to high temperatures or heated for a long time. Different plastic materials contain varying amounts of plasticizers and have different heat tolerances. Therefore, it’s essential for consumers to understand the labels on microwave-safe plastic containers.

1. Product Name

The product name helps consumers clearly identify whether the item is microwave-safe tableware and understand its attributes and shape.

2. Material

Currently, most microwave-safe plastic containers on the market are made mainly from PP (polypropylene) and/or PS (polystyrene). PP has excellent mechanical and heat-resistant properties; PS, commonly called hard plastic, is rigid and brittle but non-toxic and odorless. Containers made of PP are softer, while those mixed with PS are a bit harder. Both materials do not release toxic substances when heated in a microwave.

3. Size and Capacity

When choosing a microwave-safe container, consumers should select a size appropriate to their or their family’s actual needs.

4. Standard Compliance Number

Standards are national or industry regulations that products must or are recommended to follow. They include national, local, industry, and enterprise standards. Some are mandatory, others voluntary. Some products must comply with certain standards, while others may choose which to follow.

5. Quality and Safety Mark & Production License Number

According to national compulsory standards, plastic food containers must obtain a national industrial product production license and must display the “QS” quality and safety mark on their packaging when sold. Therefore, consumers should look for the QS mark when buying microwave-safe plastic containers. Products without this mark are best avoided.
The production license number consists of 12 digits: the first two represent the industry code, the next three the product code, and the last five the manufacturer’s license number.

6. Barcode

There are two common international barcodes: UPC and EAN. UPC is used mainly in the US and Canada, composed of 11 digits plus a check digit. EAN consists of 12 digits plus a check digit. The first three digits represent the country code, followed by four digits for the manufacturer, and five digits for the product code.
China uses the EAN barcode.
China’s country codes range from 690 to 695, Hong Kong’s is 489, and Taiwan’s is 471. Consumers can use the barcode to determine whether a microwave-safe plastic container is domestic or imported.

7. Usage Symbols – Applicable Range and Heat Resistance

Containers with these symbols can be washed in dishwashers, stored in freezers, and used in microwaves.
Containers marked as microwave-safe are generally heat-resistant up to about 120℃ and considered safe and hygienic for use.

8. Vent Hole Mark

Many microwave-safe plastic products now come with vent holes and corresponding instructions. If your container doesn’t have a vent hole, you should open the lid before microwaving to prevent explosions.

9. Inspection Mark

Products with inspection certificates tend to be more reliable in quality.

10. Manufacturer’s Name, Address, and Contact Information

It’s best to choose microwave-safe plastic containers produced by reputable and large-scale manufacturers.

Helpful Tip

Some lidded microwave-safe plastic products (like food containers or milk warmers) have a “5” mark on the bottom, indicating PP material. However, if the lid lacks this mark, be cautious—it might not be made of PP, which could affect safety.

A Real Talk for Everyday Life

We all want quick, convenient meals without worrying about what’s inside our containers. Choosing the right microwave-safe plastic food container isn’t just about convenience—it’s about keeping your family safe and healthy. With so many products out there, it’s easy to get overwhelmed, but taking a few extra seconds to check labels and certifications can save you a lot of trouble down the road.
Remember, a container that’s truly microwave-safe is more than just plastic—it’s peace of mind every time you heat up your meal. So next time you shop, don’t just go for the cheapest or the flashiest. Look for those little marks, trust your gut, and pick quality. Because your health—and your family’s health—is worth it.

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