In today’s fast-paced world, microwaves have become an essential kitchen appliance, saving us time and effort when it comes to reheating food.  However, convenience should not come at the expense of our health and the environment. We have written extensively about storing hot food in plastic containers and why we should avoid single-use plastic water bottles and even plastic baby bottles, because they all shed microplastics when exposed to high heat. Today we look at microwaving food with plastic covers and why this is not great for your health.

The Environmental Impact of Plastic Microwave Covers

Microwave food covers are usually made of cheap polypropylene (PP) plastic, so cheaply that they sell for only a couple of dollars in kitchen appliance stores. They are needed to cover your food and prevent spillage while you heat it with the microwave, saving you also hours of cleaning it afterwards. These ubiquitous plastic microwave covers, commonly used to prevent messy splatters and retain moisture during reheating, contribute to the mounting plastic pollution crisis, as they deteriorate over time, sometimes they even melt a bit, therefore they need to be replaced more often than glass for example.

In this blog article, we will dive into the world of plastic-free microwave covers and explore eco-friendly solutions for a greener, healthier kitchen.

Are Plastic Microwave Plate Covers Safe?

No, heating plastic microwave covers is not considered safe. A landmark 2023 study (1) by Hussain et al., published in the American Chemical Society’s Environmental Science & Technology revealed that microwaving polypropylene (PP) plastic and polyethylene-based (PE) reusable food pouches under different usage scenarios can release up to 4.22 million microplastics and 2.11 billion nanoplastics per square centimeter in just 3 minutes.

When plastic is heated, it can release harmful chemicals into the air and food, posing potential health risks. Using plastic microwave covers may release microplastics and nanoplastic into your food. This is particularly concerning for heating baby food considering the size of babies and their development. The article mentioned here below provide further insights into this study and the use of plastic containers in contact with food.

Related: Is It Harmful to Store Food in Plastic Containers?

Alternatives to Plastic Microwave Splatter Covers

Fortunately, there is an array of eco-friendly alternatives to plastic microwave covers that can help us reduce our plastic waste footprint and protect our health. Let’s explore some of the healthiest microwave splatter covers that are plastic-free:

1. Ceramic Microwave Plates:

One of the safest things to cover food in a microwave is to simply utilize a ceramic plate or a soup plate on top of another ceramic flat plate. Or vice versa, use a flat plate as a cover if you’re using a ceramic soup plate or a bowl to reheat your meal. This is also the most budget method as everyone has soup plates already in their kitchen.

2. Glass Microwave Plate Covers:

Using microwave-safe glass lids or plates can effectively cover food during reheating. Glass is a non-toxic and inert material that won’t leach harmful chemicals into your food, making it a safer option for your health. It’s usually available as borosilicate glass, which is more resistant to thermal shock than any other common glass, and usually as well less fragile and more durable.

3. Cotton Microwave Covers or Any Natural Fiber Cloths:

Organic cotton covers and cloths made with natural fibers like linen, or wool can be used as microwave oven food covers, provided they are made with 100% natural fabric that does not contain any synthetic material like polyester, rayon, or metallic threads, which can be flammable when heated in the microwave.

4. Silicone Microwave Covers:

Silicone microwave covers are flexible, easy to clean, and can be used repeatedly, making them a great alternative to disposable plastic covers. We’ve even seen collapsible silicone microwave covers online. Silicone is a durable, heat-resistant, and reusable material, however we do not recommend to use it in the oven, and to be careful even with microwaving for the reasons outlined here.

• A 2022 laboratory test (2) by the independent German organisation Oeko Test showed chemicals from silicone baking forms migrated into food (the test is available only in German but you’re able to translate it via Google). They tested 20 baking forms for different manufacturers and found that seven silicone baking molds released more chemicals substances into food than the German Federal Institute for Risk Assessment recommends. A supplier had, therefore, to recall his product. Furthermore, they also found noticeable silicone components in the baked muffins themselves.

5. Reusable Silicone Food Storage Bags:

We’ve noticed reusable silicone food storage bags with a microwave-safe seal on the market as another claimed eco-friendly option. Some manufacturers claim that these bags can safely cover your food during reheating and are easy to clean and reuse. For the reasons mentioned above, we do not recommend using these products while cooking, baking or microwaving food.

6. Beeswax Wraps:

Beeswax wraps, made from organic cotton infused with beeswax and jojoba oil, can also be utilized to cover dishes in the microwave, but only in short burst of maximum up to 30 seconds and never exceeding 176°F (80°C), as otherwise they will melt and loose their form. These wraps are pliable, reusable, and can be washed with cool water and mild soap after each use.

Image: Beeswax Wraps on Food Containers  – unknown.

Related: 8 Plastic Free Blender Brands for a Truly Non-Toxic Kitchen

Comparison of Plastic-Free Microwave Cover Materials

Related: Why You Should avoid Plastic Water Bottles?

5 Best Food Covers for Microwave Cooking with No Plastic

We have searched the web for the best and safest microwave covers with no plastic. Here below is our selection.

This post contains affiliate links, which means we may receive a small commission, at no cost to you, if you make a purchase through a link. This helps us continue the hard work we put into researching products and solutions to plastic/ microplastic pollution. 

Important Disclaimer: While we make our best efforts to scout plastic-free products around the world, we are also aware that sometimes we do have to make some compromise, as long as still in line with our values. In this article, we are presenting the best versions of what is available on the market. Some of the covers have knobs made of silicone, a synthetic material, and we disclose it in the product description.

Please Note: Our health content is for informational purposes only and is not intended as professional medical advice. Consult a medical professional on questions about your health. Please read our disclaimer.

1. EliteVibe All Glass Microwave Cover – Non Toxic, Non Plastic Microwave Lid Guard

When we tested all-glass splatter guards in our test kitchen, we specifically looked for models without silicone knobs to ensure a 100% plastic-and-synthetic-free experience. This 10-inch borosilicate model stood out because of its glass lid that features an oversized steam vent to keep food moist and prevent drying out. Since even the lid is made of glass, this product comes with a bonus pair of heat-resistant gloves for safe handling. It is also dishwasher safe and refrigerator safe.

Our Testing Takeaway: For the strict zero-plastic purist, this is the gold standard. Because it lacks a silicone knob, we could clean it very easily. There are no crevices where grease or dish soap can get trapped. However, you have to remember to use a glove on the glass handle.

Size: 10″ x 5″ tall or 12″ x 5″ tall

Buy on Amazon USA – Canada – Australia

2. Cuchina Safe 2-in-1 Cover ‘n Cook Plate Cover & Baking Dish – Microwave Glass Cookware

This 2-in-1 microwavable Cover ‘n Cook dish plate can be used as a 2 quart baking dish or a glass plate cover. It has a patented design with unique vents and concentric rings, hold the lid in place, allowing for easy and healthy cooking without the need of a silicone knob. You can purchase this product as a set or you can buy the vented glass microwave lids separately, as they can be used to cover mugs, bowls etc.

This product was invented by Susan Castriota, a breast cancer survivor who created the brand to offer a non-toxic, plastic-free alternative for the kitchen. She holds 3 patents on her microwave glass cookware.

Out Testing Takeaway: In our tests, the concentric rings on the base effectively locked the lid onto various bowl sizes, preventing any slipping or sliding. It is very easy to clean in the dishwasher without worrying about trapped food particles or residue. We love it, but it’s best to handle with two hands and gloves.

Size: 11″

Buy on Amazon USA – Canada – Australia

Related: 11 Truly Non-Toxic Cookware Brands for a Healthy Kitchen, Tested & Reviewed

3. Le’raze Tall Glass Microwave Splatter Cover for Food

This is a tall pure glass microwave splatter guard lid is made of borosilicate. The lid has a venting hole system that allows steam to escape in a safe manner, but also regulates the hot air to heat your food uniformly. The knob is made out of silicone and provides a safe grip, but it doesn’t touch the food from the inside of the lid. The design of this cover has been improved to include a ceramic screw, so no toxic chemicals can leach into the hot food.

Our Testing Takeaway: During our tests, the ceramic screw design gave us total peace of mind since it completely eliminates metal-to-food contact. The steam venting system works perfectly to prevent soggy leftovers, though we recommend using an oven mitt when removing it after long heating cycles as the glass retains significant residual heat.

Size: 11.75″L x 10″W, 3.2″H

Shop on Amazon USA – Canada – UK–  Australia

Related: The Benefits of Switching to a Plastic Free Electric Kettle: 13 Non-Toxic Kettles To Consider

4. Simax Casserole Borosilicate Glass Dish Set

Simax offers a plastic free casserole dish set consisting of three bowls & lids to cook your food in the oven or in the microwave without worrying about nasty chemicals leaching into your food. The products are made in Europe, in the Czech Republic, from shock resistant borosilicate glass that doesn’t not absorb odors or flavors. Their concept is a hassle free and worry-free “oven to table, to fridge, to microwave dish” using the same dish & cover to cook and store food everywhere in the kitchen saving you money in the long run. The casseroles can withstand temperatures between 572° and -40° Fahrenheit (300°/-40° Celsius).

Our Testing Takeaway: We loved this set because it functions as a brilliant multi-purpose solution for cooking, storing food, and warming it up all-in-one solution. The thermal shock resistance is outstanding; we moved a dish straight from the refrigerator into a high-powered microwave with zero cracking.

Size: different combinations

Check the latest price on Amazon USA – Canada – UK – Australia

Related: 8 Best Non Toxic Lunch Boxes That Don’t Shed Microplastics

5. SuperBee Beeswax Wraps as Microwave Covers

The SuperBee Wraps are an eco-friendly, reusable alternative to plastic cling wrap. They are ethically handmade by artisans in a social enterprise in Northern Thailand using GOTS-certified organic cotton, sustainably sourced beeswax, tree resin, and organic coconut oil. They are easy to use and naturally mold to food and bowls with the warmth of your hands.

Our Testing Takeway: We added this option for those that don’t want glass because we use their wraps in our home and they are well made and very durable. In the microwave, key is to use them only at lower temperatures and for a short time.

Shop from SuperBee
Shop from SuperBee Australia

Image Credit: I’m Plastic Free testing the SuperBee Wax Wrap Beginner Set of 3

Related: 17 Best Plastic Free Coffee Makers By Style For Delicious, Non-Toxic Coffee

FAQ on Non-toxic Microwave Food Covers

– Why Should You Cover Your Food in the Microwave?

Lightly covering your food while reheating it in the microwave keeps the steam close to your food ensuring that the dish reheats evenly, as it help retaining the moisture. So, it is better to reheat food covered as the food tastes better.

– Can You Use a Regular Ceramic Plate in the Microwave?

Yes, you can safely use most regular ceramic plates in the microwave, but just for reheating food. Check the bottom of the plate to see if it has a “microwave-safe” stamp.

– Can You Use a Regular Glass Lid in the Microwave?

Yes, provided it is labeled microwave-safe and made of tempered or borosilicate glass. Avoid glass lids with metallic rims, screws, or plastic handles, as metal sparks in the microwave and plastic leaches toxic chemicals under high heat, as reviewed in this article.

– Does “BPA-Free” Plastic Make a Microwave Cover Safe?

No. “BPA-Free” simply means the plastic does not contain Bisphenol A. However, there are other substitute bisphenols on the market that often share the same hormone-disrupting properties like bisphenol S (BPS), or bisphenol F (BPF) etc. Furthermore, most plastic microwave covers are made of polypropylene (PP), which still sheds millions of microscopic plastic particles (microplastics and nanoplastics) into food when exposed to microwave radiation and steam.

– What is the Safest Alternative to a Plastic Microwave Splatter Guard?

The safest alternative is pure borosilicate glass or a simple inverted ceramic plate. Both materials are entirely inert, meaning they will not melt, degrade, or leach chemicals or microplastics into your food at high temperatures.

Conclusion: Switch to Non Toxic Microwave Cooking Covers!

As we strive to live more sustainably and healthy, it’s essential to make conscious choices in our daily routines, including in the kitchen. By ditching plastic utensils in the kitchen and adopting healthier alternatives like plastic free microwave food covers and casseroles, we can significantly reduce our plastic waste footprint, as products made of borosilicate glass are very durable and shock resistant, therefore they don’t break easily. Plus they are a very wise choice for our own health.

Remember, the little choices we make today can have a significant impact on our future health. So, let’s take a step towards a healthier kitchen and a cleaner world by embracing plastic-free microwave covers. Together, we can protect the environment and ourselves from nasty chemicals and leave a positive legacy for generations to come.

References and Scientific Literature Sources:

(1) Hussain, K., Uddin, S., & Al-Kandari, S. (2023). Assessing the Release of Microplastics and Nanoplastics from Plastic Containers and Food Pouches under Different Usage Scenarios. Environmental Science & Technology, 57(29), 10520–10532. https://pubs.acs.org/doi/full/10.1021/acs.est.3c01942

(2) Öko-Test. (2022). Muffinformen aus Silikon im Test: Immer wieder landet Plastik im Gebäck. Öko-Test Online. https://www.oekotest.de/freizeit-technik/Muffinformen-aus-Silikon-Immer-wieder-landet-Plastik-im-Gebaeck_13329_1.html

(3) Zhu, J., Wawrzynczak, A., Niu, J., Chan, W. Y., Vivas, M., Das, D., Tourangeau, J., Zhang, G., Cao, X. L., & Feng, Y. L. (2025). Silicone bakeware as a source of human exposure to cyclic siloxanes via inhalation and baked food consumption. Journal of Hazardous Materials, 497, 139591. https://pubmed.ncbi.nlm.nih.gov/40876430/