| 1. Match the box to dry, lightweight meals | Uncoated paperboard | Lightweight and easy to stack, but can soften or leak when exposed to moisture, grease, or sauces. | Suitable for many warm, relatively dry foods. Heat and moisture performance depend on the board and construction. | Choose it for sandwiches, baked goods, and other foods that do not need a moisture barrier. |
| 2. Check the lining for saucy foods | Coated or lined paperboard | The lining can improve resistance to grease and moisture, but performance varies by coating and box design. | Do not assume every lined box is suitable for very hot food or reheating; check the supplier’s instructions. | Use for meals with sauces or oily ingredients, and verify that the lining is intended for the food and temperature. |
| 3. Choose a sturdy option for hot, moist meals | Molded fiber or bagasse | Rigid and stackable; resistance to liquid and grease varies, especially between coated and uncoated versions. | Often used for hot foods, but actual temperature limits and microwave suitability depend on the specific product. | Look for a firm lid fit and a stated temperature rating when packing foods with steam, sauces, or juices. |
| 4. Prioritize strength and crispness | Aluminum | Resists bending better than many lightweight paper options and contains liquids when seams and lids are secure. | Suitable for oven use when designed and labeled for it. Metal containers must not be used in a microwave. | Consider it for oven-ready meals or foods that benefit from retaining heat; provide separate reheating guidance. |
| 5. Confirm microwave suitability | Polypropylene (PP) | Lightweight and generally resistant to moisture; lid fit and leak protection depend on the container design. | Some PP containers are microwave-safe, but not all. Use only according to the product’s microwave and temperature labeling. | Choose a clearly labeled container when customers may reheat food, and check whether the lid must be removed first. |
| 6. Select ovenable plastic only when needed | Crystallized PET (CPET) | Rigid and suitable for many prepared meals; performance depends on the tray, lid, and manufacturer’s specifications. | Some CPET trays are designed for conventional oven use. Oven limits vary, and plastic lids are often not oven-safe. | For oven-to-table meals, confirm the exact oven rating and reheating instructions for both the tray and its lid. |
| 7. Avoid relying on foam for high-heat use | Expanded polystyrene (EPS) foam | Lightweight and insulating, but can dent or crack under pressure and may not provide a secure seal for liquids. | Not suitable for conventional ovens. Heat tolerance and microwave suitability should never be assumed. | Use only for applications permitted by the product labeling and local requirements; choose another material for oven heating. |