How to Tell If Tupperware Is Microwave Safe?
The simplest way to determine if your Tupperware is microwave safe is to check for a microwave-safe symbol (usually resembling a microwave oven) on the bottom of the container. If this symbol is absent, examine the plastic type; containers made from italicized polypropylene (PP) are generally safe for microwaving, while those made from other plastics may not be.
The Evolution of Tupperware and Microwaving
Tupperware, originally designed for food storage without microwave considerations, has evolved significantly since its inception. Modern Tupperware incorporates materials specifically engineered to withstand the rigors of microwaving. However, understanding the differences between old and new Tupperware, and the various plastic types, is crucial for safe food preparation. Early Tupperware, often made of polyethylene, was not microwave-safe and could leach chemicals or warp under heat.
Identifying Microwave-Safe Plastics
Knowing which plastics are safe for microwaving is fundamental. The Society of the Plastics Industry (SPI) created a resin identification coding system, commonly seen as a number inside a triangle on plastic containers. While this system is primarily for recycling purposes, it can offer some insight into the plastic type. However, the presence of a recycling symbol does not guarantee microwave safety.
Here’s a breakdown of common plastics and their microwave compatibility:
| Plastic Type | SPI Code | Microwave Safe? | Notes |
|---|---|---|---|
| Polypropylene (PP) | 5 | Generally Yes | Often used in microwave-safe containers. Check for the symbol. |
| Polyethylene (PE) | 2, 4 | Generally No | Can warp or melt in the microwave. |
| Polyethylene Terephthalate (PET) | 1 | No | Designed for single-use and is not heat resistant. |
| Polystyrene (PS) | 6 | No | Can leach chemicals and is not heat resistant. |
| Polycarbonate (PC) | 7 | Potentially Harmful | May contain BPA, which can leach into food. Avoid microwaving. |
The Definitive Guide: Looking for the Microwave-Safe Symbol
The most reliable way to ensure your Tupperware is microwave-safe is to look for the microwave-safe symbol. This symbol usually depicts a microwave oven with wavy lines inside. It might also be a simple image of a dish being microwaved. If the symbol is present, the manufacturer has tested and certified the container for microwave use. However, always follow the manufacturer’s instructions regarding power levels and heating times.
Practical Steps to Determine Microwave Safety
Follow these steps to determine if your Tupperware container is microwave-safe:
- Inspect the Bottom: Look for the microwave-safe symbol.
- Check the SPI Code: Identify the plastic type, but remember this is not a guarantee.
- Refer to the Manufacturer’s Website: Search for the specific Tupperware product on the official website and check its specifications.
- Conduct a Short Test (Use with Caution): If you are uncertain, microwave the empty container with a cup of water alongside for a very short period (30 seconds). Check for warping, melting, or chemical smells. If any of these occur, the container is NOT microwave-safe.
Common Mistakes to Avoid
- Assuming All Tupperware is Safe: Older Tupperware may not be microwave-safe.
- Overheating: Even microwave-safe Tupperware can warp or melt with prolonged heating.
- Ignoring Manufacturer’s Instructions: Always follow the instructions provided with the product.
- Using Damaged Containers: Cracked or damaged Tupperware can leach chemicals more easily.
- Using Tupperware for High-Fat Foods: High-fat foods can reach extremely high temperatures and potentially damage the container.
The Importance of Proper Venting
When microwaving food in Tupperware, proper venting is essential. Trapped steam can create excessive pressure, leading to explosions or damage to the container. Always leave a corner of the lid slightly open or use Tupperware specifically designed with venting features.
Choosing Microwave-Safe Tupperware: What to Look For
When purchasing new Tupperware, prioritize containers explicitly labeled as microwave-safe. Look for the symbol and check the material composition. Polypropylene (PP) is a common and generally safe choice. Consider purchasing Tupperware with built-in venting systems for added safety and convenience.
Alternatives to Plastic Tupperware for Microwaving
If you are concerned about the potential risks of microwaving food in plastic, consider using alternatives such as:
- Glass Containers: Microwave-safe glass is an excellent and safe option.
- Ceramic Containers: Ensure the ceramic is labeled as microwave-safe.
- Silicone Containers: High-quality, food-grade silicone is generally safe for microwaving.
Frequently Asked Questions (FAQs)
Can I microwave Tupperware with the lid on?
Generally, it’s not recommended to microwave Tupperware with the lid completely sealed. Trapped steam can build up pressure and cause the lid to pop off or even damage the container. Always leave a small vent or corner of the lid open, or use containers with built-in vents.
Is all old Tupperware unsafe for microwaving?
Yes, most old Tupperware is not designed to be microwave-safe. Early formulations of plastic, especially polyethylene, were prone to melting or leaching chemicals when exposed to microwave heat. It’s best to err on the side of caution and avoid microwaving old Tupperware.
What does the microwave-safe symbol look like?
The microwave-safe symbol typically depicts a microwave oven with wavy lines inside. It can also be a simplified image of a dish inside a microwave. If you see this symbol, the container is generally safe for microwave use, but always follow the manufacturer’s specific instructions.
Can I microwave Tupperware that says “BPA-free”?
Being “BPA-free” doesn’t automatically mean a container is microwave-safe. BPA (Bisphenol A) is a chemical that was previously common in polycarbonate plastics. While avoiding BPA is important, you still need to check for the microwave-safe symbol and ensure the plastic type is suitable for microwave use.
What happens if I microwave Tupperware that isn’t microwave-safe?
Microwaving Tupperware that isn’t microwave-safe can lead to several problems, including warping, melting, leaching of chemicals into your food, and even fire hazards. It’s crucial to only microwave containers specifically designed for that purpose.
How can I tell if my Tupperware has been damaged by microwaving?
Signs of damage include warping, discoloration, cracking, and a chemical smell. If you notice any of these, discontinue use immediately. Damaged containers can leach chemicals more easily and pose a health risk.
Are all plastics with the #5 recycling symbol microwave-safe?
While the #5 recycling symbol often indicates polypropylene (PP), which is generally considered microwave-safe, it’s not a guarantee. Always look for the microwave-safe symbol in addition to the recycling symbol. The recycling symbol primarily indicates the type of plastic resin, not its suitability for microwaving.
Can I put Tupperware in the dishwasher after microwaving it?
Yes, most modern microwave-safe Tupperware is also dishwasher-safe. However, it’s always best to check the manufacturer’s instructions. Some containers may be top-rack dishwasher safe only, while others may be safe on any rack.
Is it safe to microwave oily foods in Tupperware?
Microwaving oily or fatty foods in Tupperware can be risky. These foods can reach very high temperatures, potentially exceeding the container’s heat tolerance and causing it to warp or melt, even if it is microwave-safe. Use caution and monitor closely.
Can I microwave frozen food in Tupperware?
If the Tupperware is microwave-safe and explicitly stated by the manufacturer that it is freezer to microwave safe, it can be done. Otherwise, it is best to thaw food in the refrigerator before microwaving it in Tupperware. Always check with the manufacturer first.
What are the best alternatives if I don’t want to microwave plastic at all?
Excellent alternatives to plastic Tupperware for microwaving include microwave-safe glass containers, ceramic containers, and high-quality food-grade silicone containers. These materials are generally considered safer and less likely to leach chemicals into your food.
Where can I find more information about microwave-safe plastics?
You can find more information about microwave-safe plastics on the websites of reputable organizations like the FDA (Food and Drug Administration) and the Society of the Plastics Industry (SPI). You can also consult the manufacturer’s website for your specific Tupperware product.