PDLLA vs PHBH
Polymer · grade comparison
PDLLA and PHBH are both polymer grades. PDLLA is the stronger of the two: yield strength 48 MPa (6.96 ksi) against 18 MPa (2.61 ksi) for PHBH, about 167% more; tensile strength follows at 50 MPa (7.25 ksi) vs 23 MPa (3.34 ksi). In exchange, PHBH is the more ductile: elongation 150% versus 5% for PDLLA, and PDLLA is harder (82 Shore D vs 58 Shore D). PHBH is lighter (1.2 g/cm³ vs 1.25 g/cm³ for PDLLA) and PDLLA is stiffer (3 GPa vs 0.8 GPa). On the shop floor, PDLLA machines more easily (good vs fair), PHBH welds better (very good vs good), and PHBH sits in a lower cost tier (premium, $$$) than PDLLA (high, $$$$).
PDLLAChoose it when strength drives the design, or when the part is machined in volume.
PHBHChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PDLLA vs PHBH: 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
Hardness, Rockwell R
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Refractive Index
Light Transmission
Melting Temperature (Tm)
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)
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Limiting Oxygen Index
Max Service Temperature (short-term)
Same in both: Min Service Temperature -20°C-4 °F
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
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 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 | PHBH |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
PDLLA vs PHBH — frequently asked
Is PDLLA stronger than PHBH?
Yes. PDLLA has a typical yield strength of 48 MPa (6.96 ksi) against 18 MPa (2.61 ksi) for PHBH — about 167% more. Tensile strength is 50 MPa (7.25 ksi) vs 23 MPa (3.34 ksi).
Which is cheaper, PDLLA or PHBH?
PHBH 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 PHBH?
PDLLA. Its machinability rates good (60/100) against fair (45/100) for PHBH; for welding the order is PHBH first (very good, 70/100) then PDLLA (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PDLLA and PHBH 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.