Several plastics are commonly used for thermoforming, each offering different properties and advantages depending on the specific application. The best plastic for thermoforming depends on factors such as the desired characteristics of the final product, its intended use, and the manufacturing requirements. Here are some of the commonly used plastics for thermoforming:

Polyethylene Terephthalate (PET): PET is a popular choice for thermoforming due to its clarity, toughness, and excellent moisture barrier properties. It is commonly used for packaging applications such as trays, clamshells, and blister packs.

Polypropylene (PP): PP is known for its high impact resistance, chemical resistance, and versatility. It is used for a wide range of thermoformed products, including food containers, automotive parts, and medical devices.

Polystyrene (PS): PS is a versatile and cost-effective plastic option for thermoforming. It offers good clarity, rigidity, and processability. PS is commonly used for products like disposable cups, lids, food packaging, and display trays.

Polyvinyl Chloride (PVC): PVC is known for its excellent chemical resistance and durability. It is often used for thermoformed products such as blister packs, trays, and consumer packaging.

High-Impact Polystyrene (HIPS): HIPS is a variant of polystyrene that offers enhanced impact resistance. It is commonly used for applications where toughness and durability are important, such as packaging inserts, refrigerator liners, and automotive components.

Acrylonitrile Butadiene Styrene (ABS): ABS is a durable and impact-resistant plastic commonly used for thermoforming applications such as automotive parts, electronics enclosures, and consumer products.

Polycarbonate (PC): PC is a strong and transparent plastic with excellent impact resistance and heat resistance. It is used for thermoformed products that require high strength and optical clarity, such as medical devices, safety equipment, and electronic components.

It's important to consult with plastic suppliers, thermoforming experts, or conduct material testing to determine the best plastic for a specific thermoforming application. Factors such as material availability, cost, regulatory requirements, and the desired properties of the final product should be considered when selecting the appropriate plastic for thermoforming.