PBSA vs PDLLA
Polymer · grade comparison
PBSA and PDLLA are both polymer grades. PDLLA is the stronger of the two: yield strength 48 MPa (6.96 ksi) against 13 MPa (1.89 ksi) for PBSA, about 3.7 times as much; tensile strength follows at 50 MPa (7.25 ksi) vs 22 MPa (3.19 ksi). In exchange, PBSA is the more ductile: elongation 700% versus 5% for PDLLA, and PDLLA is harder (82 Shore D vs 45 Shore D). PDLLA is stiffer (3 GPa vs 0.22 GPa) and PBSA runs hotter in service (55°C vs 45°C continuous). On the shop floor, PDLLA machines more easily (good vs poor), PBSA welds better (excellent vs good), and PBSA sits in a lower cost tier (standard, $$) than PDLLA (high, $$$$).
PBSAChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
PDLLAChoose it when strength drives the design, or when the part is machined in volume.
PBSA vs PDLLA: 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
Flexural Strength
Flexural Modulus
Izod Impact, Notched
Hardness, Shore A
Hardness, Shore D
Hardness, Rockwell R
Tear Strength
Compressive Strength
Compressive Modulus
Shear Strength
Fracture Toughness (K_IC)
Physical
Density and transition temperatures.
Density
Melting Temperature (Tm)
Glass Transition (Tg)
Water Absorption (24 h)
Refractive Index
Light Transmission
Same in both: Water Absorption (Saturation) 1.2%
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
Vicat Softening Point (B50)
Limiting Oxygen Index
Max Service Temperature (short-term)
Heat Deflection Temp. @ 1.8 MPa
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dielectric Constant (1 MHz)
Volume Resistivity
Dissipation Factor (1 MHz)
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)
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)
Same in both: Modulus of Resilience 384 kJ/m³ · 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 | PBSA | PDLLA |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
PBSA vs PDLLA — frequently asked
Is PDLLA stronger than PBSA?
Yes. PDLLA has a typical yield strength of 48 MPa (6.96 ksi) against 13 MPa (1.89 ksi) for PBSA — about 3.7 times as much. Tensile strength is 50 MPa (7.25 ksi) vs 22 MPa (3.19 ksi).
Which is cheaper, PBSA or PDLLA?
PBSA is the lower-cost material: it sits in the standard tier ($$) 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, PBSA or PDLLA?
PDLLA. Its machinability rates good (60/100) against poor (25/100) for PBSA; for welding the order is PBSA first (excellent, 88/100) then PDLLA (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PBSA and PDLLA 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.