Can Plastic Take-Out Containers with Lids Be Refrigerated? PP5 vs. PS6
author: Iris
2025-10-14
1. Common Takeout Container Materials and Symbols Explained
Different materials exhibit distinct behaviors in cold temperatures. Understanding materials and symbols helps users select takeout containers with lids suitable for freezing.
PP5, PS6, PET—Significantly Different Freezing Performance
Among disposable take-out containers with lids, the three most common materials are PP5, PS6, and PET. PP typically withstands temperatures from -20°C to 120°C, offering both cold and heat resistance. It's a popular choice and highly suitable as a freezer-safe takeout container. PS offers high transparency but has poor impact resistance and becomes brittle when chilled. PET is commonly used for cold drink cups or salad containers, suitable for refrigeration but not recommended for freezing. Therefore, if both freezing and heating functions are required, PP5 is undoubtedly the safer and more practical choice.
How to Identify the Material Code of Take-Out Containers with Lids?
By looking at the numerical code on the bottom of the container, consumers can determine the material. The numbers "5" and "6" stand for PP and PS, respectively. Because of their structural inability to tolerate stress changes at low temperatures, some containers on the market may be marked "refrigerator only, not freezer safe." When choosing containers, make sure they are labeled as "freezer safe" or "suitable for use at -20°C" by consulting the product instructions or package. Proper material code identification ensures food safety by preventing containers from leaking or splitting when frozen.
Relationship Between Recyclable Take-Out Containers and Safety
"Freezer-safe" is not the same as "recyclable." The main focus of recyclable take-out containers is environmental performance; that is, the material's ability to be recycled after use. However, the physical characteristics of various plastics are determined by their molecular structure. For instance, PS cannot tolerate low temperatures, even if it is recyclable. As a result, functionality and environmental factors need to be assessed independently when choosing food containers. Selecting PP5 containers that are freezer-safe and recyclable guarantees a harmony between sustainability and usefulness.
3. Precautions and Best Practices for Freezing
Even when using freezer-safe take-out containers, attention to detail is essential to maintain container integrity and food freshness.
Sealing and Space Allocation for Takeout Containers with Lids During Freezing
When freezing food, liquids, or sauces expand and generate pressure. Leave approximately 10% space in the container to prevent deformation or lid loosening due to expansion. Ensure the lid seals tightly to prevent air ingress and food drying.
How to Extend the Lifespan of Recyclable Takeout Containers
Many consumers reuse recyclable take-out containers. Before reuse, thoroughly clean containers to remove grease residue. Use warm water and mild detergent; avoid strong alkaline cleaners that may degrade the plastic structure. Additionally, prevent prolonged sun exposure or repeated high-temperature heating to extend service life.
Freezer-to-Microwave Solution
For users requiring frequent heating or freezing, PP5 material containers are essential. These containers can be transferred directly from the freezer to the microwave. PP5's outstanding performance makes it the top choice for freezer-safe takeout containers. Its stable physical properties prevent cracking or deformation from extreme temperature changes, ensuring safe reheating.
Where to Buy?
Yangrui has been producing plastic food containers for many years. Our take-out containers with lids offer outstanding heat and cold resistance as well as improved sealing performance because they are made from premium PP5 raw materials. Selecting Yangrui's freezer-safe take-out containers improves customer happiness and brand image while successfully lowering food waste and shipping damage.
Contact us:
Phone: +86-159 8949 1653
Email: sales@yrpak.com
Email: sales@yrpak.com
References
- Plastics Industry Association. Guide to Plastic Resin Identification Codes. (2023)
- Food Packaging Forum. Safety Assessment of Food Contact Plastics: PP and PS Comparison. (2024)
- U.S. Food and Drug Administration (FDA). Food Contact Materials Guidelines. (2024)
- ISO 18604:2013 – Packaging and the Environment — Material Recycling.
- China National Standard GB4806.7-2016 – Food Contact Plastic Materials and Articles.
2. PP5 vs. PS6: A Head-to-Head Comparison of Low-Temperature Performance
Different plastics exhibit vastly different behaviors in cold environments. Comparing PP5 and PS6 provides clearer insight into which materials are suitable for freezer-safe takeout containers.
PP5
Excellent heat and cold resistance is provided by PP5 material, which can withstand temperatures between -20°C and 120°C. Its thick molecular structure keeps it flexible in cold weather, avoiding the cracking that other polymers frequently experience. Furthermore, PP5 can tolerate microwave heating, thus it may be used to reheat food straight from the freezer. PP5 is therefore the perfect material for freezer-safe takeout containers, whether they are used for home food preservation, food delivery storage, or restaurant takeout.
PS6
PS6 is widely used in cold drink cups and dessert boxes due to its high transparency. But at low temperatures, its molecular chains have a tendency to contract and solidify, making the containers fragile. When they are compressed or struck, they could break. In freezing temperatures, this brittleness is especially noticeable, endangering the safety of food storage and possibly leading to liquid leakage. As a result, PS6 is not suited for use as freezer-safe takeout containers, even though it has an attractive clarity.
How to Determine if a Food Container is Freezer Safe
Assessing a container's suitability for freezing involves three key steps:
① Check packaging labels: Reputable products typically display “Freezer Safe” or “Microwave Safe.”
② Verify material codes: The “#5” symbol on the bottom indicates PP, which offers good low-temperature resistance.
③ Consult manufacturer instructions: Trusted producers provide specified temperature ranges.
② Verify material codes: The “#5” symbol on the bottom indicates PP, which offers good low-temperature resistance.
③ Consult manufacturer instructions: Trusted producers provide specified temperature ranges.
Selecting take-out containers with lids from reputable brands not only ensures food safety but also extends product lifespan, preventing food waste caused by cold-induced breakage.
4. Conclusion
For safe freezing, the material you choose for your takeout container is essential. Be mindful of material variances when freezing takeout containers with lids, and steer clear of fragile plastics like PS6. Because of their exceptional resistance to heat and cold, PP5 containers are frequently used in home storage and catering, making them freezer-safe takeout containers. Additionally, selecting recyclable takeout containers shows a company's dedication to sustainable development in addition to supporting environmental trends.
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