Overview
Polystyrene granules are the raw material form of general-purpose polystyrene (GPPS), a thermoplastic polymer derived from styrene monomer polymerization. These pre-compounded pellets are optimized for industrial processing methods like injection molding and extrusion. As one of the most cost-effective engineering plastics, PS granules balance clarity, stiffness, and dimensional stability. Manufacturers typically produce them in 2-4 mm diameter pellets with controlled molecular weight distribution to ensure consistent melt flow characteristics during processing.
Physical and Chemical Properties
GPPS granules exhibit high light transmittance (up to 90% visible light transmission) and a refractive index of 1.59, making them suitable for transparent applications. The material's Vicat softening temperature ranges between 90-100°C, limiting its use for hot-fill applications. Chemically, polystyrene resists water, alcohols, and dilute acids but is attacked by strong solvents like acetone and toluene. The granules typically contain <0.1% moisture content, requiring minimal drying before processing. Additives like UV stabilizers or anti-static agents may be included in specialized grades.
Main Applications
Approximately 70% of PS granules are processed into disposable food packaging, including clamshell containers, cups, and cutlery. The material's FDA compliance and clarity make it ideal for food contact applications. In electronics, high-purity PS grades are used for CD/DVD cases and instrument housings. The granules also serve as feedstock for expanded polystyrene (EPS) foam production through bead expansion processes. Specialty applications include medical Petri dishes and cosmetic packaging where clarity and sterility are critical.
Safety and Storage
While polystyrene granules are stable at room temperature, they require proper ventilation during processing to prevent styrene monomer exposure. NFPA ratings classify PS as flammability class 1 (low) but with heavy smoke emission when burning. Storage recommendations include keeping bags sealed in dry conditions (<50% RH) to prevent moisture absorption. Bulk storage silos should have temperature monitoring as prolonged exposure above 40°C may cause pellet clumping. Shelf life typically exceeds 12 months when stored properly.
B2B Procurement Guide
Industrial buyers should specify technical parameters including melt flow rate (commonly 5-20 g/10min at 200°C/5kg), yellowness index (<2 for premium grades), and residual styrene content (<1000 ppm for food-grade). Bulk procurement (20+ metric tons) often attracts 5-8% price discounts. Consider regional suppliers to minimize logistics costs, as PS granules are lightweight but bulky. Quality certifications like ISO 9001 and FDA compliance documents should be verified for food-contact applications.
Related Manufacturers
- 主营：中空板、弹性体、聚丙烯、新材料、改性料、颗粒料、再生料、加纤料、镭雕料、塑料粒、板材料、树脂料、抽粒料、硅胶料、应用材料、模塑材料、耐高温料、耐候原料、导电材料、塑胶粒、聚酰胺、包胶专、防火abs、电线电缆、合金塑胶
- 主营：环保再生聚苯乙烯颗粒、环保车、废旧泡沫融化车、小型泡沫化坨机
- 主营：PEEK、PPSU、PEI、ABS再生料、TPU、PC/ABS、PA66、PA6、PBT、POM、PSU、PES、PFA、PC、ABS、PP、ETFE、PCTG、PTFE、FEP、PPO、PET、PMMA、POE、EVA、PA12
- 主营：铁氟龙、PTFE、HDPE、塑胶原料、工程塑料、蜡塑料pvc、塑料玩具、PVDF、PC、PP、pPA6、PA66、hhm5502lw、c2950-111、聚乙烯、ppo塑胶、pcg-3430r、t-45注塑、pc243r-111、pese2010g4、包装薄膜、电线电缆、照明灯具、汽车部件、耐低温热
- 主营：pps加纤、pbt树脂、abs塑胶、abs塑料、工程塑料、PC原料、LDPE原料、脱模pom、透明abs、聚丙烯、pps玻纤、阻燃abs、pp李长荣、聚乙烯pe、耐水解psu
- 主营：通用塑料、工程塑料、降解塑胶
- 主营：白色色母、彩色色母、色母、塑料抗氧化剂、颜料、珠光颜料、荧光颜料、高光填充料、色母批发、色母定制、高浓度色母、ABS色母、电线电缆色母、珠光色母、吹膜色母、注塑色母、流纹色母、发泡剂、大理石色母、经济型白色色母、珍珠棉专用色母、高光黑色母、注塑通用色母、化工桶色母、pe色母
- 主营：铁氟龙、PTFE、HDPE、塑胶原料、工程塑料、塑料玩具、特种塑料、PVDF、PC、PP、PA66、M90-44、PA-757、M2320、6020、F5A、照明灯具、汽车部件、包装薄膜、ABS、POM
- 主营：包胶料、tpr材料、tpr原料、tpe材料、tpr塑料、tpe塑料、tpe原料、tpe脚轮料、tpr透明料、tpe颗粒材料、tpr高透明料、tpe密封条料、tpr10度透明料、tpr玩具原材料、abs增韧、防火tpe包胶
- 主营：玻璃砂、研磨玻璃珠、喷砂玻璃微珠、抽粒料、玻璃粉、透明粉、玻璃鳞片、负离子液、硅微粉、空心玻璃微珠、反光粉、反光玻璃微珠、电气石、氧化铈抛光粉、酒瓶玻璃珠、玻璃球、玻璃微珠、除醛液、玻璃珠
- 主营：胶黏剂、增硬剂、液体橡胶、接枝料、通用料、相容剂、pa尼龙粉、溶剂型TPU、透明Tpu
- 主营：科思创、tpe注塑、lde灯罩、pom塑料、表带料、塑胶料、磨砂料、pom塑胶、长玻纤、abs塑胶、紫外线、pa-757a01、导电tpr、fep塑胶、pa-737a03、tpu德国、pa-747a01、pom熔指、性导电、耐寒abs、威格斯、透明tpu、连接器、lcp小米、pa6塑胶
- 主营：干燥剂、消泡剂、吸水剂、彩色母料、干燥塑料、黑色母料、填充母料、注塑消泡母料、塑料消泡母料、除湿剂、pp色母粒、电缆色母、表面亮泽、彩色注塑、拉丝吹膜、色泽鲜艳、黑色母粒、彩色母粒、碳酸钙填充、定制波纹管、吹膜管材注塑
- 主营：pvc粒子、pvc配方、注塑pvc、pvc新料、pvc材料、pvc塑料、pvc料粒、阻燃abs塑料、阻燃abs合金料、pvc注塑料、pvc管件材料、黑色pvc、pvc软质、一款pvc、pvc注朔、pvc环保、环保阻燃abs、阻燃合金abs、阻燃abs粒子、阻燃abs注塑、挤出pvc、pvc挤出颗粒
- 主营：液体橡胶、相容剂、溶剂型TPU、塑料增韧剂、可发性聚苯乙烯EPS、橡胶粉末、英全SBS、聚丁二烯橡胶RB系列、改性TPU