The raw PET resin used in preform production is typically virgin or recycled material, depending on the product’s requirements and sustainability goals. High-quality PET resin ensures clarity, strength, and barrier properties in the finished bottle.

Transparency is an important characteristic for beverage containers, as consumers often associate clarity with product purity and quality. The 28mm PET preform maintains excellent optical properties, allowing for clear, bright bottles that showcase the product inside effectively.

One of the significant features of the 28mm PET preform is its optimized weight and thickness distribution. The preform is engineered to balance material usage with mechanical strength. Lighter preforms reduce production costs and environmental impact by minimizing raw material consumption, yet they must be thick enough in critical areas to ensure durability and resistance to deformation during handling and filling.

Advanced injection molding techniques and computer-aided design (CAD) are employed to precisely control the thickness profile, enabling manufacturers to produce lightweight but robust preforms.

The 28mm PET preform is designed to perform well in stretch blow molding machines, where the preform is reheated and inflated into the final bottle shape. Its dimensions and material properties are calibrated to ensure uniform wall thickness and proper bottle contours after blowing.

Good blow molding compatibility reduces defects such as uneven wall thickness, weak spots, or bottle deformation, which are critical for maintaining product integrity during storage and transportation.

https://www.petpreformfactory.com/product/pet-preform/28mm-pet-preform-with-air-seal/

Bottle Mouth Size    Weight in Grams    Reference Capacity    Length（mm）    Number of Cartons    Remark or Note
28mm    16g    350ml-500ml    85    750pieces/Box    Gas Seal
28mm    18g    500-550ml    95    650pieces/Box    Gas Seal
28mm    21g    550-650ml    95    600pieces/Box    Gas Seal
28mm    23g    550-650ml    102    600pieces/Box    Gas Seal
28mm    26g    650ml-750ml    102    600pieces/Box    Gas Seal