CPET is the only common food-tray plastic that genuinely survives both a freezer and a conventional oven in the same tray, which is a specific material property, not a marketing description. This page sets out the technical reasons why, with the numbers behind the claim, a straight comparison against the alternatives, and what actually drives your rate when you order CPET trays from Carewell.
What CPET actually is, technically
CPET stands for crystallised polyethylene terephthalate. Standard PET is largely amorphous (its polymer chains are disordered), which is why standard PET (APET) softens and deforms well below oven temperature. Crystallising the polymer through a controlled heat-treatment step during manufacture reorders those chains into a semi-crystalline structure, which is what gives CPET its heat resistance. In practical terms, CPET trays typically withstand oven temperatures up to around 220 degrees Celsius and remain stable down to typical freezer temperatures of around -40 degrees Celsius, the same tray surviving both extremes.
CPET vs APET vs PP: a straight technical comparison
| CPET | APET | PP | |
|---|---|---|---|
| Oven safe | Yes, typically to ~220°C | No | No (conventional oven) |
| Freezer safe | Yes, typically to ~-40°C | Yes, chilled/frozen | Yes |
| Microwave safe | Yes | No | Yes |
| Clarity | Opaque/semi-opaque | Clear | Semi-clear to opaque |
| Typical use | Ready meals, freezer-to-oven products | Chilled salads, cold deli, bakery | Microwave meals, hot-fill takeaway |
| Recyclability | Widely recyclable where accepted locally | Widely recyclable where accepted locally | Recyclable where accepted locally, lower acceptance rate than PET in most kerbside systems |
The material choice is a direct function of the product’s actual heating and storage path, not a preference. A frozen ready meal reheated in a conventional oven needs CPET; a chilled salad needs APET; a hot-fill microwave meal can use PP.
Food safety and shelf life
Food contact packaging in Australia is regulated under the Australia New Zealand Food Standards Code, administered by Food Standards Australia New Zealand (FSANZ), and food-grade CPET trays are manufactured to meet these food contact material requirements. Shelf life and barrier performance depend on the full pack, tray material, lidding film seal integrity and storage temperature together, not the tray alone, which is why lidding film specification matters as much as the tray material itself.
Getting the best rate on CPET trays from Carewell
CPET tray pricing moves with a small number of real variables, understanding them is how you get the best rate rather than the first number quoted:
- Stock size vs custom mould. A stock tray size carries no tooling cost and is the lowest-cost route if it genuinely fits your product. A custom mould carries a one-off tooling cost, amortised across your order volume, so it becomes cost-competitive at genuine production scale.
- Compartment complexity. A single-compartment tray costs less to tool and produce than a multi-compartment design; specify only the compartments your product actually needs.
- Order volume. Price per tray drops at higher volume bands, and a custom mould’s tooling cost is recovered faster at higher volume, lowering the effective per-unit cost.
- Wall height and material gauge. A taller wall or heavier gauge tray uses more material and typically costs more per unit; specify to what your product actually needs to be protected, not the heaviest available option by default.
Carewell quotes against your actual product dimensions and volume rather than a fixed catalogue price, so a smaller business is not quoted against an enterprise minimum, and a high-volume account gets pricing that reflects genuine scale. Request a custom rate quote with your product dimensions, compartment needs and expected volume for pricing matched to your actual order.
The real cost comparison: tray price vs total pack cost
A cheaper tray that does not survive a customer’s actual reheating method, or that seals poorly with available lidding film, costs more once product loss and customer complaints are counted, not less. The comparison worth running is total cost per successfully delivered meal: tray cost, plus lidding film and sealing cost, plus an allowance for any failure rate at the customer’s end. Carewell will run this comparison with you before you commit to a mould.
Mould lead times
A genuinely custom tray mould typically takes several weeks from confirmed design to first production run. Carewell states this lead time honestly at quoting stage rather than an optimistic figure that slips once the order is confirmed, and will flag whether an interim stock size can bridge the gap while a custom mould is produced.
Stacking, nesting and freight efficiency
Tray wall angle and nesting depth determine how many empty trays fit in a shipping carton before filling, and how efficiently filled trays stack on a pallet without crushing lids or wasting cube space. This is a real cost lever, not a minor detail, a tray that nests poorly can add measurable freight cost across a large order simply through wasted space, before a single tray is filled. Carewell reviews nesting and stacking as part of the design conversation, not as an afterthought once a mould is already cut.
Comparing CPET against the alternatives properly
Choosing a tray material is not simply picking the most sustainable-sounding option, it is matching the material to the product’s actual journey from pack to plate. CPET earns its place specifically because it survives a freezer-to-oven cycle that neither APET nor PP can handle safely, so choosing CPET purely on cost or availability without confirming the reheating method risks a tray failure at the customer’s end, a far more expensive outcome than the material cost saved upfront. A proper comparison weighs the full path, storage temperature, transport time, reheating method, and only after those are locked in, recyclability and cost.
Who this matters most for
- Ready-meal and meal-kit brands needing a genuine freezer-to-oven format.
- Food manufacturers scaling from a co-packer into a custom-sized in-house production line.
- Retailers and foodservice operators needing a specific compartment layout for portion control.
How Carewell Group helps
Carewell Group is an Australian food packaging manufacturer and supplier, certified to ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018. We design and supply CPET, APET and PP trays specified to your product’s actual dimensions and temperature path, with matched lidding film, and quote custom and bulk rates against your actual volume rather than a fixed catalogue price.
Carewell can meet all your packaging needs for your business. Talk to our expert and we will work to your required MOQ. Call +61 (02) 8760 1491 or request samples and a rate quote. See also the full CPET trays range.
Working with your food safety and compliance team
A tray change is rarely a packaging-team-only decision for a food business operating under a HACCP or similar food safety plan, it usually needs sign-off confirming the new format holds the same shelf-life and temperature performance as whatever it replaces. Carewell provides the material specification documentation needed to support that internal review, rather than leaving your quality team to chase it down mid-changeover, which matters most when a mould lead time and a launch date are already locked in.
Frequently asked questions
Why is CPET the only tray that survives both freezer and oven?
Crystallising the PET polymer during manufacture reorders its molecular structure into a heat-stable form, typically giving CPET a safe range from around -40°C to around 220°C, which APET and PP do not match at the oven end.
How do I get the best rate on CPET trays from Carewell?
Use a stock size where it genuinely fits your product, specify only the compartments and wall height your product needs, order to a realistic volume, and request a custom quote rather than a generic catalogue price.
Is CPET food-safe?
Yes, food-grade CPET trays are manufactured to meet food contact material requirements under the Australia New Zealand Food Standards Code, administered by FSANZ.
How long does a custom CPET mould take?
Typically several weeks from confirmed design to first production run; Carewell states the real lead time at quoting stage.
Sources
- Food Standards Australia New Zealand, food contact materials: foodstandards.gov.au
- Australian Packaging Covenant Organisation: apco.org.au
Written by Alif Vasaya, digital and content strategy, Carewell Group. Carewell Group is an Australian packaging, food packaging, tape, industrial safety and 3PL supplier serving all of Australia. Last updated 21 September 2026.