mLLDPE vs UHMW-PE
Polymer · grade comparison
mLLDPE and UHMW-PE are both polymer grades. UHMW-PE is the stronger of the two: yield strength 21 MPa (3.05 ksi) against 10 MPa (1.45 ksi) for mLLDPE, about 110% more; tensile strength follows at 40 MPa (5.8 ksi) vs 30 MPa (4.35 ksi). In exchange, mLLDPE is the more ductile: elongation 750% versus 350% for UHMW-PE, and UHMW-PE is harder (64 Shore D vs 48 Shore D). UHMW-PE is stiffer (0.72 GPa vs 0.25 GPa) and UHMW-PE conducts heat better (0.41 W/m·K vs 0.33 W/m·K). On the shop floor, UHMW-PE machines more easily (very good vs fair) and mLLDPE welds better (excellent vs poor).
mLLDPEChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
UHMW-PEChoose it when strength drives the design, or when the part is machined in volume.
mLLDPE vs UHMW-PE: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Flexural Modulus
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore A
Hardness, Shore D
Compressive Strength
Compressive Modulus
Flexural Strength
Shear Strength
Hardness, Rockwell R
Physical
Density and transition temperatures.
Density
Melting Temperature (Tm)
Water Absorption (Saturation)
Light Transmission
Same in both: Glass Transition (Tg) -120°C-184 °F · Water Absorption (24 h) 0.01% · Refractive Index 1.51
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Limiting Oxygen Index
Max Service Temperature (short-term)
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dissipation Factor (1 MHz)
Volume Resistivity
Surface Resistivity
Same in both: Dielectric Constant (1 MHz) 2.3 · Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
UV / Weathering Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Polishability
Mold Shrinkage
Melt Flow Rate
Processing Melt Temperature (typ.)
Mold Temperature (typ.)
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Same in both: Embodied Water 100 L/kg12 gal/lb · Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Same in both: Thermal Diffusivity 0.2 mm²/s · Thermal Shock Resistance Index 0
Strength versus weight
Yield strength against density for every polymer grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | mLLDPE | UHMW-PE |
|---|---|---|
| CNC machining | — | Yes |
| Sheet metal | — | Yes |
| Injection molding | — | Yes |
| Default condition | — | FDA |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | — | 0.5 mm |
| Best machined surface | — | Ra 0.8 µm |
| Chrome Plating (Plastic) | — | Yes |
| EMI Shielding Coating | — | Yes |
| Painting | — | Yes |
| Soft Touch Coating | — | Yes |
| Spray Painting | — | Yes |
| UV Coating | — | Yes |
mLLDPE vs UHMW-PE — frequently asked
Is UHMW-PE stronger than mLLDPE?
Yes. UHMW-PE has a typical yield strength of 21 MPa (3.05 ksi) against 10 MPa (1.45 ksi) for mLLDPE — about 110% more. Tensile strength is 40 MPa (5.8 ksi) vs 30 MPa (4.35 ksi).
Which is cheaper, mLLDPE or UHMW-PE?
Both sit in the same relative cost tier ($$, standard); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, mLLDPE or UHMW-PE?
UHMW-PE. Its machinability rates very good (75/100) against fair (50/100) for mLLDPE; for welding the order is mLLDPE first (excellent, 90/100) then UHMW-PE (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in mLLDPE and UHMW-PE side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.