Omar Khalid
Whether or not it is safe to put plastic containers in the dishwasher depends on the type of plastic. Some plastics are designed to withstand the heat and cleaning action of detergents in a dishwasher cycle and are generally labelled as 'dishwasher safe'. However, if plastic containers are not clearly labelled as dishwasher safe, they may melt or warp due to the high temperatures and detergents, and users may be exposed to unhealthy chemicals. Disposable plastics, such as food containers and water bottles, are not dishwasher-safe and will warp and become unusable.
| Characteristics | Values |
|---|---|
| Plastic type | Thick and sturdy plastic items are more likely to be dishwasher-safe. |
| Plastic type | Thin, flimsy, and disposable plastics are not recommended for dishwashers. |
| Plastic type | Some specific plastics like PET, HDPE, LDPE, and PP have different dishwasher safety profiles. |
| Markings | Always check for "dishwasher safe" labels or symbols. |
| Markings | If not clearly labelled as dishwasher-safe, there is a risk of chemical exposure and container damage. |
| Markings | BPA-free labels do not guarantee dishwasher safety, as similar compounds may be used. |
| Markings | Recycling codes 3, 6, and 7 should be avoided in dishwashers. |
| Placement | Place plastic items on the top rack, away from direct heat. |
| Placement | Avoid deep clean or sanitizing cycles. |
| Alternatives | Glass containers are a more environmentally-friendly alternative to plastic. |
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What You'll Learn
Check for 'dishwasher safe' label
When it comes to plastic containers, it's important to exercise caution before placing them in the dishwasher. The best way to ensure your plastic containers are dishwasher-safe is to check for a "dishwasher-safe" label. This label indicates that the product has been designed to withstand the high temperatures and detergents of a dishwasher cycle.
While there is no universal symbol for dishwasher safety, some manufacturers use a cup and fork symbol or another designated icon. It's best to look for a label or symbol indicating dishwasher safety, usually found on the bottom of the container. If you're unsure, it's recommended to research the specific type of plastic to determine its suitability for the dishwasher.
Disposable plastics, such as food containers and water bottles, are typically not dishwasher-safe. They are prone to warping and becoming unusable due to the heat. Even if a plastic item is not explicitly labelled as dishwasher-safe, you can take a chance and try washing it. However, there is a risk of the plastic warping or melting, and it could release unhealthy chemicals.
It's important to distinguish between different types of plastics. Plastic with BPA, for example, should not be put in the dishwasher as the heat can cause BPA to leach into the food or beverage. Products labelled as BPA-free should be used with caution, as some companies use similar compounds that may have similar health effects. Always check if a product is truly BPA-free before putting it in the dishwasher.
To summarise, always check for a "dishwasher-safe" label or symbol on your plastic containers. If you're unsure, research the specific type of plastic or opt for hand washing to avoid any potential damage or health risks.
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Avoid plastics with BPA
When it comes to putting plastic containers in the dishwasher, it's important to exercise caution to avoid potential health risks associated with certain types of plastics. One important consideration is to avoid plastics that contain BPA, or bisphenol A, a human-made component commonly found in polycarbonate plastics used for consumer products.
BPA has been linked to negative health effects, particularly concerning heart health. While some plastic products may be labelled as ""BPA-free," research has shown that there is a possibility of BPA contamination even in these items. To minimize the risk of exposure, it is recommended to wash plastic containers before their first use. Running BPA-free bottles through multiple cycles in the dishwasher has been found to be an effective way to remove any traces of BPA that may be present.
When it comes to plastics that do contain BPA, it's best to avoid putting them in the dishwasher altogether. The high temperatures of the dishwasher can cause BPA and other harmful chemicals to leach out of the plastic, potentially contaminating your food and water. These chemicals can also leach into your skin, posing a direct health risk.
To identify if a plastic container is safe for the dishwasher, look for the label ""dishwasher-safe." Even if a container is marked as such, it's best to place it on the top rack, away from the heating element, to minimize the risk of melting or warping. Thicker, hard plastics are generally more suitable for the dishwasher than thin, flimsy plastics, which are designed for single use and should be recycled instead.
In summary, to avoid the risks associated with BPA, opt for plastic containers labelled as "BPA-free" and give them a thorough wash before their initial use. For plastics containing BPA, it's best to wash them by hand to prevent the release of harmful chemicals that can occur in the high temperatures of a dishwasher cycle.
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Place on the top rack
Placing plastic containers on the top rack of your dishwasher is generally considered the safest option. This is because the heating element of your dishwasher sits on the bottom, and the higher temperatures closer to the heating element could cause your plastic containers to melt or warp, even if they are labelled as dishwasher-safe.
It is recommended to always put plastic containers on the top rack, as far away from the heating component as possible. It is also advised to avoid using deep clean or sanitising cycles, as these may generate higher temperatures that could damage the plastic.
Even if your plastic container is labelled as dishwasher-safe, it is still at risk of wear and tear over time due to the high temperatures and strong detergents of a dishwasher cycle. Therefore, it is recommended to replace dishwasher-safe plastic containers periodically.
Additionally, it is important to note that not all plastics are created equal. Some types of plastic are more durable and can withstand the heat and detergents of a dishwasher, while others are not designed for this purpose and will warp or become unusable. Thicker, hard plastics are more likely to be dishwasher-safe, whereas thinner, flimsier plastics are more prone to warping and should be avoided in the dishwasher.
To summarise, when placing plastic containers in the dishwasher, opt for the top rack to minimise the risk of melting or warping. However, always check the labels and properties of your plastic containers before putting them in the dishwasher, as some plastics are not suitable for the high temperatures and detergents of a dishwasher cycle.
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Avoid deep clean/sanitising cycles
When putting plastic containers in the dishwasher, it is generally recommended to avoid using the deep clean or sanitizing cycles. These intensive cycles are designed for heavy-duty cleaning and often involve higher water temperatures and longer wash times, which can be too harsh for plastic items.
The high heat generated during deep clean or sanitizing cycles can cause plastic containers to warp or melt, leading to disfiguration and damage. This is especially true for containers made of thinner, more flexible plastic materials. Even if the plastic items do not melt completely, they may become distorted, resulting in uneven surfaces or changes in shape that make them less functional or aesthetically pleasing.
Additionally, the prolonged exposure to high temperatures can accelerate the breakdown of plastic materials. This can cause the containers to become brittle or develop cracks over time, reducing their durability and usefulness. Therefore, it is advisable to opt for regular wash cycles or those specifically designed for plastics, which typically use lower temperatures that are safer for plastic items.
Some modern dishwashers feature specialized cycles designed for washing plastics, which automatically adjust the water temperature and cycle duration to suit plastic items. If your dishwasher has such a setting, it is recommended to utilize it when washing plastic containers. This ensures that your plasticware receives a thorough cleaning without subjecting it to potentially damaging conditions.
If your dishwasher does not have a dedicated plastics cycle, you can still take measures to mitigate the risks associated with high temperatures. One approach is to place plastic containers on the top rack of the dishwasher, as it is usually farther away from the heating element and thus exposed to lower temperatures during the wash cycle. Additionally, ensuring that the containers are properly secured and not overcrowded can help prevent them from melting or warping due to prolonged contact with other hot items.
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Consider alternatives to plastic
While some plastics can be washed in the dishwasher, it's not always safe, and plastic items can warp or melt. Chemicals can also leach into the water that is drained out of the dishwasher.
If you're looking for alternatives to plastic, there are several options available. For food storage, glass containers are a popular alternative as they are see-through, nonporous, dishwasher, microwave, and freezer-safe, and often have airtight, BPA-free lids. Glass is also inexpensive and infinitely recyclable. You can also upcycle glass jars into food storage containers.
Another option for food and beverage storage is stainless steel, which is tough and easy to clean. Stainless steel containers can carry over 6 cups of food, making them an excellent choice for meal prep.
For shopping, you can swap plastic carry bags for totes or reusable grocery bags, and use reusable produce bags or dump everything in your trolley or basket. You can also bring your own containers to fill at bulk food stores.
For takeaway food, choose cuisines that don't come in plastic containers, and ask for your food to be put in your own reusable container. You can also ask cafes and food retailers to use your reusable cup or mason jar.
For clothing, bedding, and towels, choose organic cotton, wool, bamboo, or hemp. Sustainable clothing made from these materials won't shed plastic fibers when washed.
For children's toys, household containers, and other items, felted or recycled wool is a versatile, safe, and compostable material.
Wood from sustainably managed forests can replace plastic in items like cleaning brushes, kitchen utensils, cutting boards, tableware, and drinking straws. It is lightweight, durable, and compostable.
Beeswax wraps are a sustainable, washable, and reusable alternative to disposable kitchen wraps. They are made of cotton cloth coated in beeswax, jojoba oil, and tree resin, and can be bought pre-made or made at home.
Finally, while paper is not infinitely recyclable, it is better than plastic. Before plastic wrap, most people would wrap perishable foods in paper.
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Frequently asked questions
Check the container for a "dishwasher safe" label or symbol. If it's not labelled as such, you run the risk of ruining the container and exposing yourself to unhealthy chemicals.
The top rack, as far away from the heating component as possible.
Containers made from plastics with recycling codes 3, 6, and 7, which correspond to phthalates, styrene, and bisphenols, respectively. Disposable containers and water bottles should also be avoided, as they will warp.
