Linear Low-Density Polyethylene (LLDPE) is a thermoplastic polymer known for its unique combination of strength, flexibility, and toughness. It is produced using different catalysts and reaction conditions than traditional LDPE, resulting in a linear structure with short branches. LLDPE offers improved mechanical properties compared to LDPE, including higher tensile strength and puncture resistance. It is commonly used in various packaging applications, such as stretch films, bags, and liners, as well as in agricultural films, geomembranes, and rotational molding applications. LLDPE’s versatility, durability, and ease of processing make it a popular choice across a wide range of industries.
The main key values of Linear Low-Density Polyethylene (LLDPE) are:
Flexibility: LLDPE exhibits excellent flexibility and elongation properties, making it suitable for applications requiring stretchability and conformability, such as stretch films and flexible packaging.
Toughness: It possesses high toughness and puncture resistance, providing durability and protection for packaged goods and other applications subject to mechanical stress.
Strength: LLDPE offers enhanced tensile strength compared to LDPE, providing improved mechanical properties for applications requiring strength and resilience.
Chemical Resistance: LLDPE demonstrates good resistance to a wide range of chemicals, making it suitable for packaging materials that come into contact with various substances.
Barrier Properties: It provides effective barrier properties against moisture, gases, and odors, enhancing the shelf life and freshness of packaged products.
Processability: LLDPE is easily processed using methods such as extrusion, blow molding, and injection molding, allowing for efficient manufacturing of a wide range of products.
Environmental Sustainability: LLDPE is recyclable and can be reprocessed into new products, contributing to sustainability efforts and reducing environmental impact.
These key values collectively make LLDPE a versatile and widely used material in various industries, including packaging, agriculture, construction, and automotive.
Properties:
Density: Typically ranges from 0.91 to 0.94 g/cm³, depending on the specific grade and manufacturing process.
Melting temperature: Generally between 120°C and 140°C, making it suitable for processing via methods such as extrusion and molding.
Softening temperature: Approximately 80°C to 100°C, where it becomes pliable and can be molded or formed.
Tensile strength: Typically between 15 MPa and 25 MPa, indicating its high strength and resistance to tensile forces.
Elongation at break: Generally between 300% and 800%, representing its high flexibility and ability to stretch before breaking.
Tear strength: Typically between 50 N/mm and 150 N/mm, indicating its resistance to tearing and puncturing.
Impact strength: Generally between 10 kJ/m² and 30 kJ/m², indicating its ability to withstand impacts and mechanical stress.
Environmental stress cracking resistance: Exhibits good resistance to environmental stress cracking, making it suitable for outdoor applications.
