GPPS 1340 is a high molecular weight crystal polystyrene designed for extrusion and injection molding applications. This grade is particularly valued for producing sheets with high mechanical properties and can also be used in dilution with HIPS 7240 for extrusion of sheet for thermoforming.
 
Key Features
High Molecular Weight: Enhances the mechanical properties, making it suitable for producing robust and durable products.
Versatility in Application: Suitable for both extrusion and injection molding processes.
Compatibility with HIPS: Can be mixed with high impact polystyrene for improved processing and product properties in specific applications.
 
Applications
Sheet and Profile Extrusion: Ideal for manufacturing sheets and profiles that require high stiffness and durability.
Packaging: Used in various packaging applications where rigidity and durability are necessary.
Dilution of Impact Grades for Extrusion: Can be blended with impact grades for enhanced performance in extrusion processes.
Injection Molding: Suitable for precision molding applications requiring high detail and strength.
 
Processing Guidelines
Drying: If moisture affects product quality, granules of GPPS 1340 can be dried at 70°C for 2-4 hours to ensure optimal processing conditions.
 
Typical Properties
Melt Flow Index (200°C/5kg): 4 g/10 min (ASTM D-1238), indicating the material’s flow characteristics during processing.
Styrene Residual Monomer: Less than 500 ppm (CLG LABPSG004), ensuring low residual content for safety.
Vicat Softening Point: 97°C (ASTM D-1525), the temperature at which the polymer begins to soften under a specified load.
Rockwell Hardness: L70 (ISO 2039-2), measuring the surface hardness of the material.
Tensile Stress at Break: 44 MPa (ISO 527-2), showing the material's maximum stress capacity before breaking.
Elongation at Break: 2.5% (ISO 527-2), demonstrating the material's limited flexibility under stress.
Tensile Modulus: 3100 MPa (ISO 527-2), reflecting the stiffness of the material.
Density and Shrinkage: Approximately 1.04 kg/lit and 0.4-0.7% (ASTM D-955), important for processing and dimensional considerations.
 
Conclusion
GPPS 1340 is engineered for manufacturers looking for a polystyrene with high mechanical properties for applications such as sheet and profile extrusion, packaging, and injection molding. Its high molecular weight and compatibility with HIPS make it a versatile and reliable choice for a wide range of industrial applications.