Are Tupperware Bowls Microwave Safe? Here’s What You Need to Know

Tupperware bowls are among the most common kitchen containers used for storing, serving, and reheating food. They’re lightweight, reusable, and come in different shapes that fit perfectly in the microwave. But the question remains — are Tupperware bowls microwave safe?

The short answer is some Tupperware bowls are designed for microwave reheating, but others are not. The product’s age or resin category does not establish suitability. Check the instructions for the specific bowl and its lid before heating.

Are All Tupperware Bowls Microwave Safe?

Not all Tupperware bowls are intended for microwave use. For general guidance, see our Tupperware microwave-safety guide. Manufacturer instructions for the exact bowl determine whether and how it can be reheated; the plastic recycling code is not sufficient.

Tupperware bowls are made in different materials and product lines. A plastic recycling code alone is not a microwave-safety label. Check the microwave-use markings and manufacturer directions for the exact bowl, including any lid or temperature restrictions.

Older or unmarked bowls may lack microwave-use approval. Check the product label, packaging and manufacturer’s current care information. If you cannot confirm suitability, transfer food to a clearly labeled microwave-safe dish.

What Makes Some Tupperware Bowls Unsafe for the Microwave?

Material composition and microwave-use instructions vary by product line. The age of a Tupperware bowl or whether it is advertised as BPA-free does not alone establish whether it can be heated safely. Confirm the intended use with the manufacturer and avoid damaged or heavily worn containers. For general guidance, see Health Canada’s advice on plastics and food contact.

Bowls without microwave-safe labeling may:

• Warp or melt under high heat.
• Leach chemicals into your food.
• Retain odors or stains from previous use.
• Trap steam if sealed tightly, which may cause the lid or bowl to deform.

If your Tupperware bowl doesn’t specify “microwave safe,” it’s best to transfer your food to a glass or ceramic dish before reheating.

How to Tell If Your Tupperware Bowl Is Microwave Safe

Here’s how to confirm before you heat anything:

1. Check the product’s microwave-use labeling. Symbols differ across manufacturers, so look for written directions on the bowl, packaging or official product page. Follow any power, time or lid restrictions.
2. Do not use the recycling code as a heat rating. Polypropylene is identified by code #5 or PP, but that does not establish whether an individual bowl is approved for microwave reheating.
3. Avoid bowls that are cracked, stained, or warped. Damaged containers may not withstand heat properly.
4. If in doubt, don’t risk it. Use a microwave-safe glass or ceramic alternative.

Best Practices for Microwaving Tupperware Bowls

If your Tupperware bowl is confirmed microwave safe, follow these safety steps to prevent damage or chemical exposure:

1. Remove or vent the lid. Don’t microwave bowls with the lid tightly sealed. Steam buildup can cause pressure and warping.
2. Stir and check the food temperature. Follow the product’s microwave directions, stop to stir during reheating, and ensure leftovers reach 74°C (165°F) using a food thermometer. Health Canada recommends this temperature for leftovers.
3. Follow food-type restrictions. Some high-fat or high-sugar foods can become very hot, while tomato sauces may stain some plastics. Check the bowl’s published heating restrictions.
4. Use approved heating settings. Follow the exact product instructions; medium or low microwave power does not make an unapproved container safe.
5. Let the food cool before sealing. Avoid trapping heat and moisture inside the bowl.
6. Replace worn-out bowls. Over time, even microwave-safe plastics degrade and lose integrity.

Safer Alternatives to Microwaving Plastic Bowls

If you want to avoid the risks of heating plastic altogether, consider switching to:

• Glass containers: Choose glass containers labeled for microwave use, follow their care instructions, and avoid chipped or cracked pieces.
• Ceramic dishes: Excellent for reheating without leaching chemicals.
• Silicone bowls: Use only food-grade silicone products whose manufacturers explicitly permit microwave reheating.

Tupperware is great for food storage, but when it comes to heating, glass and ceramic are safer long-term choices.

Conclusion

Some Tupperware bowls are designed for microwave reheating, while others are not. Check the product-specific microwave instructions, follow any power or heating restrictions, and inspect the bowl for wear before use.

Using your Tupperware bowls properly keeps your food safe, your containers lasting longer, and your microwave in good shape.

FAQs About Microwaving Tupperware Bowls