White Polystyrene Rolls and HIPS Sheets for Thermoformed Yogurt Cups

White HIPS (High Impact Polystyrene) rolls and sheets serve as one of the core substrates for thermoformed food packaging. Specifically designed for disposable food service containers—such as yogurt cups and coffee cup lids—this material combines rigidity, toughness, thermoforming stability, and food-contact safety. Offering controllable costs and high molding efficiency in large-scale production, it has become a mainstream choice within the food packaging sector.

Modified through the incorporation of polybutadiene rubber, HIPS overcomes the inherent brittleness limitations of General Purpose Polystyrene (GPPS). Its impact strength is enhanced by more than four times, featuring a Vicat softening point of approximately 90°C and a heat deflection temperature ranging from 70°C to 96°C—thereby satisfying the dual requirements for material toughness and heat resistance critical to the thermoforming process. Its white, opaque surface is uniform and smooth, boasting a gloss level of up to 85%; this facilitates the printing of brand logos and graphics while simultaneously blocking light to preserve the quality and flavor of contents such as yogurt and coffee. The material is typically supplied in rolls with thicknesses ranging from 0.3 mm to 2.0 mm, featuring precise thickness tolerances that make it highly compatible with high-speed thermoforming production lines. During vacuum or pressure forming, it softens uniformly and maintains stable molding depths, effectively preventing issues such as cracking, deformation, or uneven wall thickness, thereby significantly reducing scrap rates.

Regarding food-contact safety, this material strictly adheres to relevant food-contact directives. Produced using food-grade virgin resins, it ensures that residual styrene monomer levels and additive migration rates remain well within established regulatory limits. It is odorless, non-toxic, and suitable for direct contact with both hot and cold beverages, making it ideal for applications involving refrigeration, ambient storage, and mildly heated drinks. With a water absorption rate of less than 0.7%, it exhibits excellent dimensional stability; post-molding, it resists shrinkage and warping, maintaining structural integrity during stacking and transportation to effectively protect the contents of the containers.

From a process and cost perspective, HIPS requires lower thermoforming temperatures and shorter molding cycles compared to materials such as PET or PP, resulting in reduced energy consumption and lower equipment wear. Furthermore, its moderate material density allows for the production of a greater number of containers per unit of weight, offering significant overall cost advantages. Furthermore, the material is recyclable and reusable; it generates no toxic or harmful substances upon incineration, thereby aligning with the trends in green packaging. Currently, it is widely utilized in products such as yogurt cups, coffee cup lids, disposable food containers, and food trays. Thanks to its stable performance, efficient molding characteristics, and compliance with safety standards, it has emerged as the preferred substrate for thermoforming processes within the food and beverage packaging industry.