Overview
Idemitsu SPS (Syndiotactic Polystyrene) is an engineering plastic developed by Japan's Idemitsu Kosan, distinguished by its syndiotactic polymer structure. Unlike conventional polystyrene, SPS offers superior thermal stability (continuous use up to 180°C) and chemical resistance, making it a preferred material for demanding applications. First commercialized in the 1990s, SPS combines the processability of thermoplastics with performance characteristics rivaling PPS and LCP resins. Its balanced properties stem from its highly ordered molecular arrangement, achieved through metallocene catalyst technology.
Physical and Chemical Properties
SPS exhibits a unique combination of high heat deflection temperature (HDT up to 250°C for glass-filled grades) and low dielectric constant (2.4-2.6 at 1MHz), outperforming many engineering plastics in electrical applications. Its crystallinity (typically 50-60%) contributes to exceptional dimensional stability under thermal cycling. Chemically, SPS resists acids, alkalis, and automotive fluids but is susceptible to aromatic hydrocarbons. Its moisture absorption rate (<0.1% at 23°C/50% RH) is significantly lower than nylon or PBT, minimizing post-molding dimensional changes.
Main Applications
In automotive systems, SPS is used for sensor housings, fuel system components, and under-hood connectors due to its heat and chemical resistance. Electronics manufacturers utilize it for surface-mount device (SMD) components and high-frequency connectors where low dielectric loss is critical. The material's FDA compliance enables food contact applications like microwaveable containers. Industrial uses include chemical pump components and precision gears, benefiting from SPS's wear resistance and creep stability at elevated temperatures.
Safety and Storage
SPS pellets are stable under normal conditions but require protection from moisture absorption (recommended ≤0.1% moisture content before processing). Storage in sealed containers with desiccants is advised, particularly for hygroscopic glass-filled grades. Processing at temperatures above 300°C may generate styrene monomers—adequate ventilation and fume extraction are essential. Material Safety Data Sheets (MSDS) classify SPS as non-hazardous, though dust inhalation precautions should be observed during handling.
B2B Procurement Guide
Industrial buyers should specify required properties: unfilled (standard), 30% glass-fiber reinforced (GF30), or mineral-filled grades. Key parameters include melt flow rate (MFR, typically 10-50 g/10min at 300°C/1.2kg) and UL temperature index ratings. Lead times for specialty grades may extend to 8-12 weeks. Consider regional availability—Idemitsu produces SPS primarily in Japan and Singapore. For prototyping, inquire about sample quantities (usually 1-5 kg minimum). Third-party certifications like ISO 9001 and IATF 16949 (automotive) indicate quality compliance.
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