HIPS 7240 is a very high impact polystyrene specifically designed for the extrusion industry, optimized for deep-draw thermoforming applications. It is engineered to be diluted with crystal polystyrene and is notable for its excellent melt strength. This grade is available in a white color, making it aesthetically suitable for visible applications.
 
Key Features
Very High Impact Resistance: Ensures durability and resilience, making it ideal for applications where robustness is crucial.
Good Melt Strength: Facilitates deep-draw thermoforming, allowing for the creation of complex shapes and deep-drawn parts.
Food Contact Approval: Suitable for contact with food, making it a prime choice for packaging edible products.
 
Applications
Thermoformed Packaging: Used extensively for producing cups, trays, egg boxes, and general packaging.
Co-Extrusion with GPPS: Ideal for industrial sheets, where it is co-extruded with general-purpose polystyrene.
Food Containers: Perfect for containers that directly contact food items.
 
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: 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.
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.
 
Conclusion
HIPS 7240 is engineered for applications requiring high impact resistance, excellent thermoformability, and suitability for food contact. Its capability to produce visually appealing and structurally robust products makes it highly sought after in the packaging industry, especially for food-related applications.