Plastic bottle caps are usually made from one of several types of plastic, including PE, PP, PS, PET, etc., but the properties of each material are different, and the specific type of plastic used in a bottle cap depends on a variety of factors. Examples include the type of beverage or product being bottled, the manufacturing process, and the desired properties of the cap. Let's get acquainted briefly.

Polyethylene (PE): This is the most commonly used plastic in bottle caps. It is lightweight, durable, and resistant to chemicals and moisture.

Polypropylene (PP): PP is another commonly used bottle cap plastic. It is heat resistant, tough, and has a high melting point.

Polystyrene (PS): PS is a lightweight, rigid plastic commonly used in bottle caps for carbonated beverages. It also impacts and is heat resistant.

Polyethylene Terephthalate (PET): PET is a strong, lightweight, and recyclable plastic commonly used in water and soft drink bottle caps.

Acrylonitrile Butadiene Styrene (ABS): ABS is a strong and impact-resistant plastic used to make more demanding bottle caps, such as for automotive or industrial use.