Microwavable packaging

Microwavable packaging lets consumers heat food in a microwave oven without removing it from the pack. It is used for ready meals, rice, vegetables, soups and microwave popcorn.

What makes a pack microwavable

• No metal layers: aluminium foil and metallised films reflect microwaves and can cause arcing, except for specially engineered susceptors such as in popcorn bags.
• Heat resistance: steam can push inner surfaces above 100 °C and fatty foods can get hotter still, so heat-resistant materials such as CPP and PET are common.
• Food contact at temperature: heating increases migration, so compliance must cover the heating conditions.

Venting steam

Steam builds pressure inside a closed pouch. Self-venting valves or channels, tear notches opened before heating, and peelable seals let it escape safely, and they also allow food to steam-cook in its own moisture.

Practical points

Without metal, barrier may be lower, so EVOH or clear barrier coatings may be needed for longer shelf life. Print clear heating instructions and consider a cool-touch grip area. Share product type, fat content, portion size and heating time with your converter, and test in microwaves of different power levels before launch.