Can You Microwave Solo Cups [Critical Facts!]

Can You Microwave Solo CupsThere comes a time when you’re late and find yourself in a hurry. That’s when you think of using your solo cup to heat your drink or coffee in the microwave.

But one question that may run into your mind is can you microwave solo cups and whether solo cups are microwave safe.

No, solo cups are not safe for microwave use. They are not BPA-free, meaning they comprise dangerous chemicals that can leach into your drinks when heating via the microwave.

Solo cups can also get extremely hot when put inside the microwave. Moreover, the heat will melt the plastic, and it might become messier.

Is it safe to Microwave Solo Cups?

No, it is not safe to microwave solo cups. Solo cups are one-use throwaway cups that distort completely with a slight rise than normal temperature.

Because the cup is made using a thin plastic coat, it’s hard for it to resist greater temperatures.

Due to this, microwaving your solo cup is an unbelievable act.

Can You Microwave Solo CupsEven if you try to gamble by experimenting, a possible outcome will be the solo cup melting and the liquid pouring into your microwave. Though the main formation of the solo cup is to simplify your work, microwaving solo cups may prove otherwise.

Although solo cups boast many advantages, they do have some restrictions. One of them is that you can’t microwave your coffee using a solo cup.

If you really have to use disposable cups for microwaving in the future, don’t rely on surplus solo cups from the previous party. Alternatively, buy and keep some microwavable, non-reusable cups when you need to use them.

Why Are Solo Cups Unsafe for Microwave Use?

Solo cups are not microwave safe because they are made from materials that leak chemicals when put in the microwave. If you’re planning to warm your cold coffee in the microwave using a solo cup, it’s not advisable to do that.

Plastics are labeled with numbers one to seven to enable you to identify whether they are reusable, recyclable, microwave-safe, or not. Both red and blue solo cups fall in the number six group since they are made from Styrofoam or polystyrene, which are not microwave-friendly.

Solo cups are one-use functional disposable cups specifically designed to simplify your work after an event. Microwaving them may cause toxic chemicals to leach into your drink.

So ensure you check for a ‘Microwave safe’ label on whichever plastic you intend to use. Containers that fall in group number 5 contain Polypropylene plastics and are microwave safe and heat resistant.

Microwave’s Reaction With Solo Cup

Whenever you insert a solo cup into the microwave, the cup’s surface will become extremely hot. Besides, the cup’s bonding will become weak. Then, bisphenol A (BPA) and polypropylene which exists in the plastic, will begin to leach and get into your drink.

These toxic chemicals can interfere with your health even if taken in small quantities. Below are some of the dangers related to BPA ingestion.

  • Diabetes
  • Cardiovascular disease
  • Hormone disruption
  • Reproductive disorders
  • Prostate or breast cancer

Nevertheless, the high chances are that before you even have the opportunity of removing the cup from the microwave, it will melt because it’s plastic.

Are Red Solo Cups Microwave Safe?

Can You Microwave Solo CupsRed solo cups are not microwave safe, and to be certain, only negative things will happen if you use the cup in the microwave. That’s to say, if you insert red solo cups in the microwave, they will definitely melt and cause a mess in your microwave. Again, it won’t be fun cleaning molten plastic from your microwave.

Basically, solo cups’ core purpose is to serve coffee and drinks but are not to use for rewarming drinks in the microwave.

Apart from melting, worse may occur if the content from the solo cups enters the microwave. It can destroy its entire inner parts, which might stop the microwave from working. Furthermore, you may burn your fingers when grasping the solo cups.

Although some people may use the red solo cups for some seconds by first putting a paper base in the microwave to help when heating their coffee, it’s still not recommendable to do that since it can be risky if not done carefully.

Most red solo cups are made from plastic, and some plastic varieties contain VPA chemicals that are considered unhealthy, and if the cup is used to reheat drinks, there’s a high probability that the hot drink may distress your stomach.

At What Temperature Do Solo Cups Start to Melt?

Though plastics start melting at 170 degrees Celsius, the plastic that makes solo cups (Polystyrene branded number 6) begins melting at 100-200 degrees Celsius. Its figure starts deforming at a much lesser temperature than this.

That’s why you’ll notice solo cups start shrinking and distorting their shape once you pour hot drinks into them. The microwave interior becomes hotter than 100 degrees Celsius causing solo cups to melt when microwaving.

What Kind of Cups Are Microwave Safe? Alternatives to Solo Cups)

Can You Microwave Solo CupsPlastics contain a certain number, anywhere between one and seven. These numbers enable you to easily identify what type of plastic is used. Specifically, if it’s:

  • Microwave safe or not
  • Reusable or non-reusable
  • Recyclable or non-recyclable

Irrespective of the solo cup variety, they are all placed at number 6. In this cluster, the product encompasses Styrofoam or Polystyrene, so they are not microwave safe.

Others that are not microwave safe are numbers three, six, and seven. Yet products classified as number five are usually polypropylene plastics and are highly heat resistant. Thus they are safe for microwave use.

Even so, these numbers can be somehow confusing. You should know what containers are the best alternatives to solo cups to be secure. Any time you want to warm your drink, consider using:

  • Microwave safe glass cups
  • Ceramic cups
  • Silicon cups

Faqs About Can You Microwave Solo Cups

Can You Microwave Solo Plastic Containers?

Solo containers fall in the number six cluster since they are made using Polystyrene or Styrofoam, which are not microwave-friendly. Solo cups are single-time-use disposable cups designed to simplify your job after an event. Heating them can cause toxic chemicals to leach into your drink.

What Happens if You Microwave a Plastic Cup?

According to producers, plastic cups are branded as microwave-friendly and safe for microwave use. However, the USDA affirms that paper containers are safer for microwave use than polystyrene or plastic. Some plastics might melt if exposed to high microwave heat.

Are Solo Sauce Cups Microwave Safe?

Solo sauce cups are not safe to go in the microwave because they will cause chemicals to leach into your drink. Never use plastics labeled #6 or those with recycling numbers three, six, and seven.

Are Paper Solo Cups Microwave Safe?

Paper solo cups are safe to microwave though you should check the safety provisions. You can microwave your solo paper cups for two seconds maximum on medium heat. However, it’s contingent on how the paper cups are designed and what materials are used to make the cup.

Can Solo Cups Melt?

Solo cups will start melting even at very low temperatures. That’s why you can notice them shrink and distort when you pour hot drinks into them. If the microwave interior gets hotter than 100 degrees Celsius, solo cups will melt in the microwave.

Are Solo Cups Toxic?

After disposing of your solo cup, it goes to a compost pit, and after decomposing for half a century, it releases poisonous chemicals into the adjacent soil. These chemicals are toxic to the environment.

Can You microwave a Glass Cup?

Yes, glass is very microwave friendly. If you get a new glass container that is not labeled microwave safe, try to test it using the recommended glass test.

Can Solo Cups Hold Boiling Water?

Heating or pouring hot water into a solo cup discharges the chemical antimony or bisphenol A, famous as BPA. The answer is a yes with a warning. Most solo cups are ideal for holding hot or cold liquids, but it depends on their material.

Can You Microwave Acrylic Cups?

Polycarbonate and PET are not ideal for microwaving because they are known to absorb heat. Polystyrene and acrylic are also not ideal to microwave. You should be careful when heating foods with high fat and sugar levels as they can destroy microwave-safe containers.


Shortly put, you can’t microwave a solo cup because doing so is never safe. It’s because these cups are very delicate and cannot endure the high microwave temperatures. Therefore, the solo cup will become weak and melt the drinks in the microwave. Furthermore, the spills can cause a huge mess to your microwave.

If you attempt to microwave it, the solo cup will get hot and release toxic BPA particles into your beverage. The toxins may affect your health, and the hot solo cup may burn your fingers. So the best alternative is to warm your drink using a microwave-safe cup.

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