LyondellBasell Lupolen 5231 HX HDPE Resin

Physical Properties

• Density: The density stands at 0.952 g/cc (0.0344 lb/in³), contributing to the material’s strength – to – weight ratio in applications like closures and storage boxes.
• Water Absorption: Water absorption is 0.010 %, which is beneficial for products that need to resist water penetration and maintain their structural integrity.
• Moisture Absorption at Equilibrium: At equilibrium, moisture absorption is 0.10%, reflecting slightly higher but still moderate moisture uptake under prolonged humidity exposure.
• Linear Mold Shrinkage, Flow: In the flow direction, linear mold shrinkage measures 0.023 cm/cm (0.023 in/in), critical for predicting dimensional stability in injection-molded parts.
• Linear Mold Shrinkage, Transverse: In the transverse direction, linear mold shrinkage is 0.024 cm/cm (0.024 in/in), showing minor differential shrinkage across material flow axes.
• Melt Flow: At 190 °C (374 °F) under a 2.16 kg (4.76 lb) load, the melt flow is 3.3 g/10 min, showing a medium – flow property ideal for diverse molding applications.

Polymer Properties:

• Base Material: High – Density Polyethylene (HDPE)
• Modification Features:
  
  • Medium flow offers a balance between processability and product quality during molding.
  • High impact and stress – crack resistance enhance the durability of products in harsh conditions.

Applications:

Lupolen 5231 HX is primarily used for creating durable, rigid parts that need to withstand physical stress and environmental factors. Its applications include:

• Packaging for Carbonated Beverages: The resin’s very high environmental stress cracking resistance (ESCR) makes it ideal for bottles that contain carbonated liquids. 
• Storage and Tote Boxes: Its robust impact resistance and rigidity are perfect for producing reusable containers like storage boxes and tote boxes that are subjected to repeated handling and potential rough treatment.
• Engineering Components: The combination of excellent mechanical properties, including stiffness and impact strength, makes it suitable for various engineering components where durability is essential.
• Caps and Closures: While it is a medium-flow grade, its properties make it suitable for manufacturing certain caps and closures that require a high degree of durability and stress-crack resistance.