PLLA FR vs PLLA GF30
Polymer · PLLA grade comparison
PLLA FR and PLLA GF30 are two grades of the same polymer grade, PLLA: FR (flame-retardant PLLA) versus GF30 (30% glass-fiber reinforced PLLA). The chemistry is identical, so every difference below comes from the condition. PLLA GF30 is the stronger of the two: yield strength 60 MPa (8.7 ksi) against 44 MPa (6.38 ksi) for PLLA FR, about 36% more; tensile strength follows at 100 MPa (14.5 ksi) vs 45 MPa (6.53 ksi). In exchange, PLLA FR is the more ductile: elongation 2.5% versus 2% for PLLA GF30. PLLA FR is lighter (1.35 g/cm³ vs 1.45 g/cm³ for PLLA GF30) and PLLA GF30 is stiffer (9 GPa vs 3.6 GPa). On the shop floor, PLLA FR machines more easily (good vs fair) and PLLA GF30 welds better (very good vs good).
PLLA FRChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PLLA GF30Choose it when strength drives the design, or when the part sees heat.
PLLA FR vs PLLA GF30: 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
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Flexural Strength
Flexural Modulus
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell R
Same in both: Shear Modulus 1.3 GPa0.19 Msi · Bulk Modulus 4 GPa0.59 Msi · Poisson's Ratio 0.36 · Compressive Modulus 3.3 GPa0.48 Msi
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 175°C347 °F · Glass Transition (Tg) 61°C142 °F · Water Absorption (24 h) 0.4% · Water Absorption (Saturation) 1% · Refractive Index 1.46 · Light Transmission 88%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
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
Same in both: Specific Heat Capacity 1,500 J/kg·K0.36 BTU/lb·°F · Min Service Temperature -20°C-4 °F · Max Service Temperature (short-term) 80°C176 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Dielectric Strength 18 kV/mm457 V/mil · Dielectric Constant (1 MHz) 3 · Dissipation Factor (1 MHz) 0.015 · Volume Resistivity 1×10¹⁶ Ω·cm · Surface Resistivity 1×10¹⁶ Ω
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Mold Shrinkage
Melt Flow Rate
Same in both: Polishability 70 / 100 · Processing Melt Temperature (typ.) 205°C401 °F · Mold Temperature (typ.) 30°C86 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 50 MJ/kg21,496 BTU/lb · Embodied Carbon (primary production) 1.3 kg CO₂/kg · Typical Recycled Content 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.
PLLA FR vs PLLA GF30 — frequently asked
Is PLLA GF30 stronger than PLLA FR?
Yes. PLLA GF30 has a typical yield strength of 60 MPa (8.7 ksi) against 44 MPa (6.38 ksi) for PLLA FR — about 36% more. Tensile strength is 100 MPa (14.5 ksi) vs 45 MPa (6.53 ksi).
Which grade does FabDigit quote by default, FR or GF30?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
Which is easier to machine, PLLA FR or PLLA GF30?
PLLA FR. Its machinability rates good (58/100) against fair (45/100) for PLLA GF30; for welding the order is PLLA GF30 first (very good, 75/100) then PLLA FR (good, 62/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PLLA FR and PLLA GF30 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.