The Science Behind CPET Trays: Why They’re Ideal for High-Heat Foods

CPET (Crystallized Polyethylene Terephthalate) trays have become a staple in ready-to-eat meals, foodservice applications, and shelf-stable packaging—and for good reason. These containers offer a rare combination of thermal performance, durability, and food safety, making them one of the most reliable options for products exposed to a wide range of temperatures.

Built for Temperature Extremes

CPET trays are specifically engineered to handle both high and low temperatures. That makes them ideal for foods that are:

• Hot-filled during processing
• Frozen for distribution
• Microwaved or oven-heated by the consumer

The crystallized structure of CPET gives it high thermal resistance, allowing it to maintain shape and structural integrity even when exposed to temperatures up to 400°F in conventional ovens—or as low as -40°F during frozen storage.

Performance Meets Food Safety

One of the main advantages of CPET over standard PET or PP containers is its ability to retain mechanical strength and barrier properties under heat. That’s essential for products like prepared meals, where container failure can mean spills, compromised seals, or food contamination.

Teinnovations carefully evaluates the interaction between CPET trays and the foods they hold, ensuring compatibility with:

• Acidic or high-fat formulations
• Moisture content and migration risk
• Steam release and pressure buildup during reheating

Perfect for Dual Ovenable Applications

Unlike many plastic containers, CPET trays are designed to go from freezer to oven to table, making them a favorite in dual ovenable formats. When paired with the right sealing film and equipment, these trays offer a complete solution for products that need:

• Extended shelf life
• Safe consumer reheating
• Attractive presentation and rigidity

Engineering the Right Fit

At Teinnovations, we don’t just supply CPET trays—we help clients engineer complete tray and sealing systems based on their specific food product, shelf-life goals, and processing conditions. We consider critical factors like:

• Sealing surface compatibility
• Tray depth and geometry for portion control
• Lidding film behavior during cooking or microwaving

Is CPET Right for Your Product?

Not every food item needs a CPET tray—but for high-heat, dual-ovenable, or hot-fill applications, it’s hard to beat. If you’re developing a product that demands thermal versatility and food safety, CPET may be the solution that ensures your product performs from plant to plate.

Looking to build a high-performance tray solution around your food product?

Contact Teinnovations to discuss CPET trays and custom sealing systems tailored to your process.