Polypropylene (PP) sheet is one of the most widely used materials for thermoformed food packaging, including microwaveable trays, takeaway containers, and ready-meal packaging.
Compared with other thermoforming plastics such as PET and PS, PP sheet offers superior heat resistance, chemical stability, and flexibility, making it ideal for packaging that must withstand reheating or hot filling.
This guide explains:
PP sheet is a thermoplastic sheet made from polypropylene resin, commonly produced through extrusion and supplied in roll form for thermoforming machines.
In thermoforming production lines, PP sheets are heated and molded into packaging such as:
PP sheet is widely used in food packaging applications where heat resistance is required.
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| Property | Typical Value |
|---|---|
| Density | 0.90 g/cm³ |
| Heat Resistance | up to 120–130°C |
| Vicat Softening Temperature | 140–150°C |
| Tensile Strength | 30–35 MPa |
| Food Safety | FDA / EU compliant |
Key advantages:
✔ excellent heat resistance
✔ microwave safe
✔ lightweight material
✔ good chemical resistance
✔ recyclable plastic
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Thickness depends on the packaging structure and strength requirements.
| Application | Typical Thickness |
|---|---|
| Yogurt cups | 0.30 – 0.50 mm |
| Food trays | 0.50 – 1.00 mm |
| Microwave containers | 0.70 – 1.20 mm |
| Heavy-duty food trays | 1.00 – 1.50 mm |
Thin gauges are suitable for high-speed thermoforming lines, while thicker sheets provide stronger structural rigidity.
PP sheet has a higher forming temperature compared with PET.
| Material | Forming Temperature |
|---|---|
| PET sheet | 120 – 160°C |
| PP sheet | 160 – 200°C |
Because PP requires higher heating temperatures, thermoforming machines must allow sufficient heating time.
However, once formed, PP trays provide better heat resistance during food reheating.
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How Thickness Tolerance Affects Thermoforming Stability
PP sheet is widely used for:
These applications require heat resistance and food safety compliance.
One of the biggest advantages of PP is microwave compatibility.
PP trays can typically withstand temperatures up to 120°C, making them ideal for:
PP sheet is also used for:
because of its excellent barrier properties and rigidity.
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| Feature | PP Sheet | PET Sheet |
|---|---|---|
| Heat Resistance | Excellent | Moderate |
| Transparency | Lower | Very high |
| Microwave Safe | Yes | Limited |
| Rigidity | Medium | High |
| Typical Use | Food trays | Clear packaging |
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Common PP sheet types include:
Higher stiffness and rigidity.
Used for:
Higher impact resistance and flexibility.
Used for:
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When sourcing PP sheet rolls for thermoforming, buyers typically evaluate:
Reliable manufacturers provide stable sheet thickness and good thermoforming performance, which are essential for automated production lines.
Yes. Polypropylene can typically withstand temperatures of up to 120°C, making it suitable for microwave food containers.
PP sheets are usually translucent rather than fully transparent.
For high clarity packaging, PET sheet is usually preferred.
Most thermoformed food trays use 0.6–1.0 mm PP sheet thickness.
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