LLDPE MLLDPE
Grade
ASTM D1248 Type I · ISO PE-LLD
MLLDPE = metallocene LLDPE
Choose the narrow-MWD metallocene C6/C8 resin for films and seal layers needing higher clarity, heat sealability and puncture/tear strength, reaching 45 MPa tensile and 800 % elongation.
Values for the MLLDPE condition
Other LLDPE grades and fills
LLDPE is listed in 6 conditions; see the grade overview at LLDPE.
Compare all 6 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
MLLDPEThis page Metallocene LLDPE | Choose the narrow-MWD metallocene C6/C8 resin for films and seal layers needing higher clarity, heat sealability and puncture/tear strength, reaching 45 MPa tensile and 800 % elongation. | 10 | 45 | 800 | 46 Shore D |
Injection-moulding grade | Choose the high-MFI 15–50 injection grade for thin-wall closures, containers and toys where fast filling and short cycles rule; tensile 18 MPa and ESCR sit below the film grades. | 11 | 18 | 500 | 52 Shore D |
Flame-retardant | Pick for low-smoke halogen-free cable sheathing and building products: about 60 % ATH/MDH mineral loading buys V-0 and LOI ≥ 30 but cuts elongation to 180 % and hurts flexibility and processing. | 11 | 12 | 180 | 58 Shore D |
Carbon-black (2–2.5 %) weatherable black compound | Pick the 2–2.5 % carbon-black compound for mulch film, geomembranes, pipe and cable jacketing where the best long-term outdoor weathering matters; the part is opaque black, elongation 650 %. | 12 | 26 | 650 | 52 Shore D |
Crosslinkable / peroxide-crosslinked LLDPE | Choose for fuel tanks, chemical tanks and wire insulation where peroxide crosslinking raises heat resistance to 105 °C plus ESCR and hydrocarbon resistance, but the part can no longer be remelted or recycled. | 14 | 20 | 400 | 58 Shore D |
Rotomoulding grade | Use the hexene rotomoulding grade at ~0.935 g/cm³ and MFI 3–6 for water tanks, chemical tanks and road barriers; powder flow and sintering are good with excellent low-temperature impact. | 17 | 22 | 600 | 58 Shore D |
What is LLDPE MLLDPE?
LLDPE MLLDPE is LLDPE in the MLLDPE grade — choose the narrow-MWD metallocene C6/C8 resin for films and seal layers needing higher clarity, heat sealability and puncture/tear strength, reaching 45 MPa tensile and 800 % elongation. LLDPE MLLDPE has a yield strength of 10 MPa (1.45 ksi) and a tensile strength of 45 MPa (6.53 ksi) — weaker than 91% of polymer grades. Elongation at break is 800% and the elastic modulus is 0.2 GPa (0.029 Msi). LLDPE MLLDPE has a density of 0.92 g/cm³ (0.0332 lb/in³), lighter than 80% of polymer grades. Its glass-transition temperature is -110°C (-166 °F).
Advantages
- Ductile — tolerates forming and impact — 800%, better than 100% of polymer grades
- Readily welded — 95/100, better than 99% of polymer grades
- Forms and bends easily — 95/100, better than 99% of polymer grades
- Low moisture uptake — 0.01%, better than 97% of polymer grades
- Low embodied carbon — 2 kg CO₂/kg, better than 96% of polymer grades
Limitations
- Low strength — 10 MPa (1.45 ksi), worse than 91% of polymer grades
- High mold shrinkage — 2.2%, worse than 87% of polymer grades
- Hard to polish — 30/100, worse than 82% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
LLDPE MLLDPE properties
Typical room-temperature values for LLDPE MLLDPE; 32 are specific to this condition. Other listed values are LLDPE reference data and may not represent this condition. Bars are the position among polymer grades.
Physical6
LLDPE MLLDPE has a density of 0.92 g/cm³ (0.0332 lb/in³), lighter than 80% of polymer grades. Its glass-transition temperature is -110°C (-166 °F).
Mechanical17
LLDPE MLLDPE has a yield strength of 10 MPa (1.45 ksi) and a tensile strength of 45 MPa (6.53 ksi) — weaker than 91% of polymer grades. Elongation at break is 800% and the elastic modulus is 0.2 GPa (0.029 Msi).
Thermal11
LLDPE MLLDPE is rated for continuous service to 80°C (176 °F). It conducts heat at 0.33 W/m·K (0.191 BTU/hr·ft·°F), better than 89% of polymer grades. Thermal expansion is 180 µm/m·K (100 µin/in·°F).
Electrical7
LLDPE MLLDPE is an electrical insulator with a dielectric strength of 25 kV/mm (635 V/mil) and a resistivity of 1×10¹⁵ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 74% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of LLDPE MLLDPE takes about 78 MJ of energy and emits 2 kg of CO₂ — less than 88% of polymer grades. Typical recycled content is 10%.
Manufacturability8
LLDPE MLLDPE's machinability is fair (50/100, worse than 73% of polymer grades); weldability excellent (95/100); formability excellent (95/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with LLDPE MLLDPE
Is LLDPE easy to machine?
Turns, mills and drills, but the material is soft and gummy: use sharp large positive-rake tools, high spindle speed, generous feed and air cooling to clear chips and avoid heat distortion. Dimensions drift with temperature and internal stress, so it is unsuitable for tight-tolerance machined parts.
Can LLDPE be welded?
Heat fusion is excellent — hot-plate, hot-gas rod, extrusion welding, heat sealing and ultrasonic or RF welding (RF needs polar additives) all work. Only crosslinked XL grades cannot be re-welded.
Can LLDPE be formed, bent or molded?
Processed mainly by blown or cast film, injection moulding, rotomoulding and extrusion. Melt strength is lower than LDPE, so blown film needs higher back pressure and air-ring adjustment; shrinkage is 1.5–3%, and rotomoulded wall thickness should be compensated for about 3% shrink.
What surface finishes work on LLDPE?
The non-polar surface must be corona-, flame- or plasma-treated to at least 38 dyn/cm before printing, coating or adhesive bonding. Plating is not possible; colour with masterbatch rather than paint.
LLDPE chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| 1-butene / 1-hexene / 1-octene comonomerα-olefin giving short-chain branching; C6/C8 give better tear & ESCR than C4 | 1 – 12 | 7 |
| antioxidant / process stabilizer packagehindered phenol + phosphite | 0.05 – 0.3 | 0.15 |
| slip / antiblock (film grades)erucamide + silica/talc | 0 – 0.5 | 0.2 |
| carbon black (black grades)UV protection, ASTM D1248 Class C | 0 – 2.5 | 2.3 |
| ethylene (C2H4) repeat unitlinear backbone | ≥ 88 (balance) | — |
LLDPE MLLDPE — frequently asked
What is LLDPE MLLDPE used for?
LLDPE MLLDPE is typically used for stretch and shrink film, flexible packaging film, cable insulation, rotomolded tanks and agricultural film. In short: tear-tough LDPE upgrade; standard rotomoulding resin; excellent heat-fusion weldability.
What is the yield strength of LLDPE MLLDPE?
LLDPE MLLDPE has a typical yield strength of 10 MPa (1.45 ksi) and a tensile strength of 45 MPa (6.53 ksi) — weaker than 91% of polymer grades. Strength varies by condition: see the 6 listed tempers.
Is LLDPE MLLDPE easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 73% of polymer grades). Turns, mills and drills, but the material is soft and gummy: use sharp large positive-rake tools, high spindle speed, generous feed and air cooling to clear chips and avoid heat distortion. Dimensions drift with temperature and internal stress, so it is unsuitable for tight-tolerance machined parts.
Can LLDPE MLLDPE be welded?
Yes — weldability is rated excellent (95/100). Heat fusion is excellent — hot-plate, hot-gas rod, extrusion welding, heat sealing and ultrasonic or RF welding (RF needs polar additives) all work. Only crosslinked XL grades cannot be re-welded.
What surface finishes work on LLDPE MLLDPE?
The non-polar surface must be corona-, flame- or plasma-treated to at least 38 dyn/cm before printing, coating or adhesive bonding. Plating is not possible; colour with masterbatch rather than paint.
Can LLDPE MLLDPE be formed, bent or molded?
Processed mainly by blown or cast film, injection moulding, rotomoulding and extrusion. Melt strength is lower than LDPE, so blown film needs higher back pressure and air-ring adjustment; shrinkage is 1.5–3%, and rotomoulded wall thickness should be compensated for about 3% shrink.
What is the maximum service temperature of LLDPE MLLDPE?
LLDPE MLLDPE is rated for continuous use to about 80°C (176 °F), and briefly to 95°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM D1248 — Polyethylene Plastics Extrusion Materials — ASTM International (2016)
- ASTM D638 / D790 / D1238 / D256 test methods — ASTM International (2022)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- CAMPUS / UL Prospector polyethylene datasheets — CAMPUS Consortium / UL (2024)
- LLDPE film, injection and rotomoulding grade datasheets — Dow / ExxonMobil / SABIC / Borealis / Sinopec (2024)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.