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3) When closing Tupperware is no longer as effective
A plastic container that no longer closes properly should not be used for food storage. It can no longer properly maintain the freshness of food and protect it from bacterial contamination.
4) If the Tupperware was used in the microwave or dishwasher
Even if the manufacturer indicates otherwise, it is best to avoid putting your plastic boxes in the dishwasher or microwave . In fact, exposure to heat degrades this material more quickly, which is particularly sensitive to it. This can then deform the box, making it less waterproof, but also release microplastics and other substances toxic to human health into food (phthalates and potentially bisphenol A on older models). Even if your container is of a brand or quality, avoid heating it.
As summarized by Andrea De Vizcaya-Ruiz, doctoral professor at the University of California Irvine, they should ultimately be disposed of “ when they show wear, damage or deterioration ”. So be sure to check them regularly , for example before use. The specialist also ensures that the containers used by restaurants, particularly in the context of home delivery, are not suitable for long-term use .
How to make a plastic box last longer?
If you are really concerned about the durability of your container (and therefore also its ability to preserve food well), the best thing to do is still to opt for a glass jar . More ecological, the glass jars, the ceramic container or, when possible, the metal box are in fact much more durable and solid . If, however, you already have an entire collection of plastic boxes and you intend to keep them carefully, follow these few tips to protect them from damage and make them last longer.
Take care to always wash Tupperware and plastic boxes by hand
Avoid putting your plastic containers in the dishwasher, as its aggressive wash cycle can damage them over time. Preferably hand wash with lukewarm water and mild soap . Adding baking soda, lemon juice or even toothpaste can remove unpleasant stains and odors effortlessly. However, the best thing is to prevent odors and stains from becoming embedded in the plastic . To do this, also rinse your containers immediately after use and allow them to dry completely before storing them.
Be careful what you put inside
In addition to not heating them in the microwave, also remember to never place hot dishes directly in plastic boxes. Let them cool to room temperature before storing. Also avoid storing foods rich in coloring such as tomato sauce, beetroot or soy sauce in plastic containers as much as possible, as they can stain the walls.
Be well equipped
When serving or stirring food in your plastic containers, opt for plastic or wooden utensils rather than metal utensils that could scratch the surface. Also, make sure you use the original lids , designed to fit your plastic boxes perfectly. Poorly fitted lids can allow air and moisture to enter, which can affect food quality.
Finally, don’t overload the Tupperware
Above all, do not overload your plastic boxes. Leave enough space for food to breathe and expand , especially when freezing.
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