Linear light polyethylene (LLDPE)
LLDPE is a stronger and more flexible alternative to LDPE and has better resistance to punctures and tears due to its linear molecular structure.
What is Linear Low-Density Polyethylene (LLDPE)?
Linear Low-Density Polyethylene (LLDPE) is a type of polyethylene that has a linear structure with short branches. It is produced by copolymerizing ethylene with comonomers such as butene, hexane, or octene under controlled pressure and temperature. The density of LLDPE is typically in the range of 0.915 to 0.925 g/cm3.
⚙️Technical and mechanical properties of linear light-weight polyethylene (LLDPE)
✅LLDPE is a combination of the properties of LDPE and HDPE and therefore has good flexibility, high tensile strength, excellent resistance to tearing and stress cracking.
✅Its melting point is usually between 120 and 125 degrees Celsius.
✅This polymer has high processability in blow molding, film making and extrusion methods.
✅Note:
• The density of LLDPE is between LDPE and HDPE
• It is very resistant to chemicals (except strong oxidants)
| Property | Value / Characteristics |
|---|---|
| Density | 0.915-0.925 g/cm³ |
| Melting Point | 122-124°C |
| Glass Transition Temp (Tg) | -120°C to -100°C |
| Thermal Expansion Coeff. | 200×10⁻⁶/K |
| Water Absorption | <0.01% (24h immersion) |
| Continuous Heat Resistance | 80-90°C (grade dependent) |
| Transparency | Semi-transparent to opaque (depends on comonomer & crystallinity) |
| Melt Flow Index | 0.1 to 25 g/min (application dependent) |
🏭 Applications of Linear Light Weight Polyethylene (LLDPE)
🔹 Packaging industry (most used)
Stretch films (for pallet wrapping)
Strong nylon films (heavy duty carrier bags)
Food packaging (meat, vegetable wrapping)
🔹 Agricultural industry
Greenhouse films (UV resistant, tear resistant)
Plastic mulch (reduces soil evaporation)
🔹 Pipes and fittings
Drip irrigation pipes (crack resistant)
Industrial flexible pipes
🔹 Molded products
Flexible toys
Automotive parts (wire covering, flexible housings)
🔹 Wire and cable industry
Insulation of electrical cables (due to good dielectric properties)
Advantages and disadvantages
The advantages of LLDPE include high strength, flexibility, good impact and cracking resistance, and excellent formability. In contrast, it has lower heat resistance and transparency than LDPE and is more expensive than regular lightweight polyethylene.
Comparison of LLDPE with other polyethylenes (LDPE, LDPE)
| Property | LLDPE | LDPE | HDPE |
|---|---|---|---|
| Density (g/cm³) | 0.915-0.925 | 0.915-0.935 | 0.941-0.965 |
| Molecular Structure | Linear with short branches | Branched | Linear |
| Tensile Strength | High | Medium | Very High |
| Impact Resistance | Excellent | Good | Medium |
| Flexibility | High | Very High | Low |
| Primary Application | Stretch films | Soft films | Bottles, Pipes |
Produced
Products manufactured with linear light polyethylene (LLDPE)
NEX0002 (LL22B02 Base)
NEX0002 is a linear low density polyethylene grade with 1-butene as the co-monomer and is commonly used for film applications. LLDPE is known for its high tensile strength, flexibility and impact resistance, making it ideal for a variety of packaging and industrial applications. It has a density of 0.922 (g/cm³) and a melt flow index of 2 (190 °C/2.16 Kg).
NEX0009 (LL0209 Base)
Linear Low Density Polyethylene NEX0009 is a special grade of polyethylene copolymer (LLDPE) that uses butene as a comonomer. It is designed for film extrusion processes and offers the typical properties of LLDPE, such as increased flexibility, strength and toughness. It has a density of 0.920 (g/cm³) and a melt flow index of 0.9 (190 °C/2.16 Kg).
