HIPS 7240 WB is a high-impact polystyrene specifically designed for the extrusion industry, offering a blend of durability and aesthetic appeal. This grade is particularly suited for deep-draw thermoforming processes and is available in a unique white blue color. It has been approved for food contact, making it ideal for various packaging applications.
 
Key Features
Very High Impact Resistance: Ensures durability and resilience in final products, suitable for high-stress applications.
Good Melt Strength: Facilitates deep-draw thermoforming, allowing for the creation of complex shapes and deep-drawn parts.
Food Contact Approval: Meets regulatory standards for food safety, suitable for packaging edible products.
 
Applications
Thermoformed Packaging: Ideal for producing dirty sheets, cups, trays, and egg boxes.
General Packaging: Used for various consumer packaging applications requiring impact resistance and safety.
Co-Extrusion with GPPS: Suitable for industrial sheets, combining with general-purpose polystyrene for enhanced properties.
 
Typical Properties
Melt Flow Index (200°C/5kg): 4.5 g/10 min (ASTM D-1238), indicating the flowability of the material under heat.
Styrene Residual Monomer: <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.
Rockwell Hardness: Scale/R65 (ISO 2039-2), measuring the surface hardness of the material.
Tensile Stress at Yield: 23 MPa (ISO 527-2), indicating the stress at which the material begins to deform.
Tensile Stress at Break: 21 MPa (ISO 527-2), showing the material's maximum stress capacity before breaking.
Elongation at Break: 60% (ISO 527-2), indicating the flexibility of the material.
Tensile Modulus: 1950 MPa (ISO 527-2), reflecting the stiffness of the material.
Izod Impact: 11 KJ/m2 (ISO 180/1A), demonstrating the material's resistance to impact at room temperature.
Density and Shrinkage: Approximately 1.04 kg/lit and 0.4-0.7% (ASTM D-955), crucial for processing and dimensional considerations.
 
Conclusion
HIPS 7240 WB is engineered for manufacturers looking for a reliable and safe material for packaging and thermoforming applications. With its high impact strength, good melt strength, and food contact approval, it is an excellent choice for a wide range of industrial and consumer packaging solutions.