PDLLA vs PHBV
Polymer · grade comparison
PDLLA and PHBV are both polymer grades. PDLLA is the stronger of the two: yield strength 48 MPa (6.96 ksi) against 25 MPa (3.63 ksi) for PHBV, about 92% more; tensile strength follows at 50 MPa (7.25 ksi) vs 27 MPa (3.92 ksi). In exchange, PHBV is the more ductile: elongation 8% versus 5% for PDLLA, and PDLLA is harder (82 Shore D vs 75 Shore D). PDLLA is stiffer (3 GPa vs 1.8 GPa) and PHBV runs hotter in service (95°C vs 45°C continuous). On the shop floor, PHBV sits in a lower cost tier (premium, $$$) than PDLLA (high, $$$$).
PDLLAChoose it when strength drives the design.
PHBVChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
PDLLA vs PHBV: 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
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Shear Modulus
Same in both: Hardness, Rockwell R 95 HRR
Physical
Density and transition temperatures.
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Refractive Index
Light Transmission
Melting Temperature (Tm)
Same in both: Density 1.25 g/cm³0.05 lb/in³
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
Same in both: Dielectric Constant (1 MHz) 3
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 40 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Polishability
Mold Shrinkage
Processing Melt Temperature (typ.)
Mold Temperature (typ.)
Same in both: Weldability 55 / 100 · Melt Flow Rate 10 g/10 min
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/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 0.1 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 | PDLLA | PHBV |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
PDLLA vs PHBV — frequently asked
Is PDLLA stronger than PHBV?
Yes. PDLLA has a typical yield strength of 48 MPa (6.96 ksi) against 25 MPa (3.63 ksi) for PHBV — about 92% more. Tensile strength is 50 MPa (7.25 ksi) vs 27 MPa (3.92 ksi).
Which is cheaper, PDLLA or PHBV?
PHBV is the lower-cost material: it sits in the premium tier ($$$) while PDLLA is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, PDLLA or PHBV?
PDLLA, by a small margin. Both rate good for machinability — 60/100 against 55/100 for PHBV.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PDLLA and PHBV 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.