Ultem 1000 GF10 vs Ultem 1000 GF20
Polymer · Ultem 1000 grade comparison
Ultem 1000 GF10 and Ultem 1000 GF20 are two grades of the same polymer grade, Ultem 1000: GF10 (10% glass-fiber reinforced) versus GF20 (20% glass-fiber reinforced). The chemistry is identical, so every difference below comes from the condition. Ultem 1000 GF20 is the stronger of the two: tensile strength 152 MPa (22 ksi) against 124 MPa (18 ksi) for Ultem 1000 GF10, about 23% more. In exchange, Ultem 1000 GF10 is the more ductile: elongation 6% versus 4% for Ultem 1000 GF20. Ultem 1000 GF10 is lighter (1.34 g/cm³ vs 1.42 g/cm³ for Ultem 1000 GF20) and Ultem 1000 GF20 is stiffer (6.9 GPa vs 4.5 GPa).
Ultem 1000 GF10Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
Ultem 1000 GF20Choose it when strength drives the design.
Ultem 1000 GF10 vs Ultem 1000 GF20: 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.
Ultem 1000 GF10Ultem 1000 GF20
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Elongation at Break
Flexural Strength
Flexural Modulus
Izod Impact, Notched
Same in both: Shear Modulus 1.2 GPa0.17 Msi · Bulk Modulus 4 GPa0.55 Msi · Poisson's Ratio 0.36 · Yield Strength (0.2% offset) 105 MPa15.2 ksi · Compressive Strength 140 MPa20.3 ksi · Compressive Modulus 2.9 GPa0.42 Msi · Shear Strength 90 MPa13.1 ksi · Fracture Toughness (K_IC) 3.3 MPa·√m3 ksi·√in · Hardness, Shore D 87 Shore D · Hardness, Rockwell M 109 HRM · Hardness, Rockwell R 125 HRR
Physical
Density and transition temperatures.
Density
Same in both: Glass Transition (Tg) 217°C423 °F · Water Absorption (24 h) 0.25% · Water Absorption (Saturation) 1.25% · Refractive Index 1.66 · Light Transmission 78%
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Heat Deflection Temp. @ 1.8 MPa
Same in both: Thermal Conductivity 0.22 W/m·K0.13 BTU/hr·ft·°F · Specific Heat Capacity 1,100 J/kg·K0.26 BTU/lb·°F · Max Service Temperature (continuous) 170°C338 °F · Min Service Temperature -50°C-58 °F · Heat Deflection Temp. @ 0.45 MPa 210°C410 °F · Vicat Softening Point (B50) 219°C426 °F · Limiting Oxygen Index 47% · Max Service Temperature (short-term) 200°C392 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹⁵ Ω·m3.94×10²² µΩ·in · Dielectric Strength 33 kV/mm838 V/mil · Dielectric Constant (1 MHz) 3.15 · Dissipation Factor (1 MHz) 0.0013 · Volume Resistivity 1×10¹⁷ Ω·cm · Surface Resistivity 1×10¹⁶ Ω · Comparative Tracking Index (CTI) 175 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 85 / 100 · UV / Weathering Resistance 35 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Mold Shrinkage
Same in both: Weldability 60 / 100 · Formability (cold) 50 / 100 · Polishability 80 / 100 · Melt Flow Rate 9 g/10 min · Processing Melt Temperature (typ.) 370°C698 °F · Mold Temperature (typ.) 150°C302 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 250 MJ/kg107,481 BTU/lb · Embodied Carbon (primary production) 8.5 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · 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.
Ultem 1000 GF10 vs Ultem 1000 GF20 — frequently asked
Is Ultem 1000 GF20 stronger than Ultem 1000 GF10?
Yes. Ultem 1000 GF20 has a typical tensile strength of 152 MPa (22 ksi) against 124 MPa (18 ksi) for Ultem 1000 GF10 — about 23% more.
Which grade does FabDigit quote by default, GF10 or GF20?
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, Ultem 1000 GF10 or Ultem 1000 GF20?
Ultem 1000 GF10. Its machinability rates good (55/100) against fair (48/100) for Ultem 1000 GF20.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ultem 1000 GF10 and Ultem 1000 GF20 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.