Polyethylene (PE): low temperature resistant (-50~80℃), suitable for frozen food, cling film, but not microwaveable.

Polypropylene (PP): the only microwaveable plastic (130 ℃), suitable for hot food packaging.

Polyester (PET): strong oxygen barrier, widely used in beverage bottles and vacuum packaging, but lower temperature resistance (≤ 70 ℃).

Aluminum foil composites: such as PET/aluminum foil/CPP, resistant to high-temperature steaming (above 121°C), commonly used for sauces and ready-to-eat foods.