Freezer-Grade PP Container: Brittleness and Cold Chain
Homopolymer vs copolymer
| Resin | Impact at −18°C | Cost | Best use |
|---|---|---|---|
| PP homopolymer | brittle, cracks | baseline | ambient, chilled |
| PP impact copolymer | ductile | +5–10% | frozen |
| PP + elastomer blend | very ductile | +12–18% | deep freeze, rough handling |
If a customer freezes the packed food and ships it, homopolymer is the wrong material regardless of price. This is one of the most common quality failures in cold-chain packaging.
Specification
| Item | Value |
|---|---|
| Resin | PP impact copolymer |
| Service temperature | −30°C to +100°C |
| Wall | ≥0.6 mm |
| Drop test | 1.2 m at −18°C, no crack |
The drop test you should demand
Room-temperature drop tests pass for containers that fail in a real freezer. Ask for a 1.2 m drop at −18°C after 24 hours conditioning, 10 samples, no failure. It is a 10-minute test and it prevents an entire container-load of complaints.
FAQ
Can the same container be frozen and microwaved? Yes if it is impact copolymer. Homopolymer handles the microwave but not the freezer.
Does a thicker wall help in the freezer? Only up to a point — material type matters more than thickness.
Next step
Tell us the cold-chain temperature and how the product is handled. We will specify resin, not just wall thickness.
Related reading
- PP vs PET vs PS Food Containers: Which Plastic Is Right for Your Menu?
- 32oz PP Soup Container: PF-GG950 and PF-L950
- Leak-Proof PP Container: Gasket vs Valve vs Fit
Models covered on this site: 750 ml PF-SQ750S · 750 ml PF-RG750 · 950 ml PF-GG950 · see all models in this category.
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