Is PP 5 Microwave Safe? Complete Guide & Usage Tips for You

Table of Contents

1. Is PP 5 Microwave Safe?

2. Which Plastics Are Microwave Safe?

3. How to Safely Use PP 5 Containers in the Microwave?

4. Types of Microwave-Safe PP Containers for Hot Food

5. Looking to Buy PP 5 Microwave-Safe Containers

Plastic containers are a part of our lives, and with how fast life is moving, microwaves have become a handy tool for heating food in most homes. But not all plastic containers can handle high temperatures. PP 5 (polypropylene, labeled with the number 5) is a common food-grade plastic. It's often used to make lunch boxes, fresh food containers, and other everyday items. So, is PP 5 microwave safe?

This guide will help you figure out if PP 5 is good for microwaves, how to tell which plastics are compatible with microwaves, and the types of PP 5 containers you can use for microwave heating. It's important for consumers, restaurant owners, and food packaging suppliers to understand which materials are safe for microwave use to avoid health risks and make sure food is handled properly.

Is PP 5 Microwave Safe?

Polypropylene (PP), identified by resin code #5, is usually considered microwave safe. PP 5 plastic is lightweight and durable. It's resistant to heat and moisture, non-toxic, and BPA-free. You can use it for hot food or microwave applications. PP plastic melts at a relatively high temperature, so it can usually handle microwave heating without melting or releasing harmful chemicals in normal use.

Plastic #5 (PP) is generally considered safe for use in microwave ovens and is frequently utilized in microwaveable food containers. Some of these containers are tested and labeled as microwave safe, which is the best way to tell if they're suitable for the microwave. If a PP container doesn't say it's microwave safe, it's best to avoid microwaving in it because it might release chemicals into food or degrade.

The safety of the product depends on how it's made and any additives that might be in it. So, not all plastic containers are microwave safe. To be safe, use plastic containers that say "microwave safe." Except for PP 5, are other plastics safe to use in microwaves? Let's keep exploring.

Which Plastics Are Microwave Safe?

We'll learn about different types of plastic: the ones that are safe to use in the microwave and the ones that aren't.

Common Microwave Safe Plastics

Polypropylene (PP, plastic #5)

Polypropylene is one of the safest plastics for microwave use because it melts at a high temperature up to 230°F, which means it can handle the heat produced during typical microwave reheating.

High-Density Polyethylene (HDPE, plastic #2)

HDPE is marked as recycling code #2. It is a strong, common plastic that is used in milk jugs, food containers, and many types of bottles. It is popular for food storage because it is durable and safe for food contact. 

HDPE is usually safe to use in a microwave under normal conditions. It can handle temperatures from about -40°F up to 266°F (-40°C to 130°C). However, HDPE can't handle as much heat as polypropylene (PP, #5). If HDPE is exposed to intense microwave heat for a long time or many times, it can deform or get damaged.

Polyethylene Terephthalate (PET, plastic #1)

PET is a popular material for single-use food containers like salad boxes and water bottles. It can't handle a lot of heat and might warp or melt. When heated, it may also release antimony and other chemicals.

Polystyrene (PS, plastic #6)

Polystyrene, or Styrofoam, is a plastic that's not heat-resistant and has a low melting point. It can deform, melt, and release potentially harmful chemicals when microwaved.

Polyvinyl Chloride (PVC, plastic #3)

PVC is not often used for food packaging and cannot be microwaved. It can leak chemicals, including plasticizers like phthalates, and it may release hazardous substances (such as chlorine gas) if it overheats.

Now that you know the different types of microwave-safe plastics, you need to know how to tell if a plastic container is safe for the microwave.

How to Safely Use PP 5 Containers in the Microwave

Look for the Microwave-Safe Symbol or Label

Look for labels that say "Microwave-Safe," "Microwave Friendly," or a microwave symbol. The symbol might be on the bottom or the side of the container. Some containers clearly say "Microwave Safe" or "Microwaveable." If the container has the symbol or words on it, it's been tested and approved for microwave use. Also, make sure the lid is made from a plastic that's safe for the microwave. If you're not sure, it's better to leave the lid off so that steam can escape and prevent warping.

Avoid Overheating

Don't use PP 5 containers to microwave food for a long time. It's best to reheat food in shorter intervals (like 1-2 minutes).

Make Sure the Container Is Intact

Always check your PP 5 containers. If you see cracks, discoloration, or warping, the plastic is no longer safe to use in the microwave.

Check Plastic Resin Codes (Plastic Number)

On the bottom of most plastic containers, you'll see a recycling triangle with a number. Take a look at the plastic numbers below:

Generally speaking, type 5 (PP) is the safest option for microwaving. As for types 2 and 4, it's always best to check with the manufacturer just to be safe. Types 1, 3, 6, and 7 aren't safe for microwaves and may release harmful chemicals.

Perform a Microwave Test (If Unsure)

First, fill the container with water and put it in the microwave. Then, heat on high for a minute. Finally, if the container gets hot, it means the material is soaking up the heat from the microwave. On the other hand, if the container stays cool and only the water inside it gets hot, you can use the container in the microwave without worrying.

If you find out that a container isn't safe to use in the microwave, don't use it in the microwave. This will help prevent any risk of chemicals getting into the microwave and causing damage. 

What's the best choice when you're picking a plastic container? It’s recommended to use containers labeled with the microwave symbol or "Microwave Safe," and those marked with recycling code 5 (PP).

Types of Microwave-Safe PP Containers for Hot Food

Plastic containers are used a lot in the food service industry. Polypropylene food containers are especially popular. They're durable and safe to use in the microwave. That's why they're so popular for takeout and delivery. Here are some common food containers for hot liquids or solid food.