Overview
High Flow GPPS is a variant of general-purpose polystyrene optimized for superior flow characteristics during injection molding. Its low viscosity in molten state allows for intricate mold designs and thin-walled products, reducing cycle times and energy consumption. As an amorphous thermoplastic, it retains the inherent clarity and rigidity of standard GPPS while offering enhanced processability. It is widely favored in mass production due to its cost-efficiency and compatibility with automated manufacturing systems.
Physical and Chemical Properties
High Flow GPPS exhibits a melt flow index (MFI) typically ranging from 15-30 g/10 min (measured at 200°C/5 kg), significantly higher than standard GPPS. This property ensures rapid mold filling and reduced injection pressure. Chemically, it is resistant to water, alcohols, and dilute acids but susceptible to aromatic solvents and UV degradation. Its glass transition temperature (Tg) is around 100°C, limiting use in high-heat environments without additives.
Main Applications
The primary use of High Flow GPPS is in injection-molded disposable items such as cutlery, tumblers, and cosmetic packaging. Its clarity and gloss make it ideal for CD/DVD cases and display panels. In the food industry, FDA-compliant grades are employed for yogurt cups and transparent lids. Non-food applications include stationery items and toy components, where its rigidity and ease of coloring are advantageous.
Safety and Storage
While GPPS is generally considered non-toxic, processing at temperatures above 270°C can release styrene monomers, requiring fume extraction systems. Workers should use PPE to avoid inhalation of dust during pellet handling. Storage recommendations include keeping bags sealed in a humidity-controlled environment (<50% RH) to prevent moisture absorption, which can cause defects during molding. Shelf life is typically 12 months if stored properly.
B2B Procurement Guide
When sourcing High Flow GPPS, prioritize suppliers with ISO 9001 certification and batch-specific MFI test reports. For food-contact applications, ensure compliance with FDA 21 CFR or EU 10/2011 regulations. Bulk buyers should negotiate prices based on quarterly contracts to mitigate market volatility. Sample testing for thermal stability and impact resistance is advised before large-scale procurement.
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