POM-H GF20 vs POM-H GF25
Polymer · POM-H grade comparison
POM-H GF20 and POM-H GF25 are two grades of the same polymer grade, POM-H: GF20 (20 % glass-fiber reinforced) versus GF25 (25 % glass-fiber reinforced). The chemistry is identical, so every difference below comes from the condition. POM-H GF25 is the stronger of the two: tensile strength 125 MPa (18.1 ksi) against 105 MPa (15.2 ksi) for POM-H GF20, about 19% more. In exchange, POM-H GF20 is the more ductile: elongation 3.5% versus 3% for POM-H GF25. POM-H GF20 is lighter (1.56 g/cm³ vs 1.61 g/cm³ for POM-H GF25) and POM-H GF25 is stiffer (9 GPa vs 6.5 GPa).
POM-H GF20Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
POM-H GF25Choose it when strength drives the design.
POM-H GF20 vs POM-H GF25: 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)
Elongation at Break
Flexural Strength
Flexural Modulus
Izod Impact, Notched
Hardness, Rockwell M
Same in both: Shear Modulus 1.1 GPa0.16 Msi · Bulk Modulus 4 GPa0.58 Msi · Poisson's Ratio 0.37 · Yield Strength (0.2% offset) 70 MPa10.2 ksi · Compressive Strength 110 MPa16 ksi · Compressive Modulus 2.9 GPa0.42 Msi · Shear Strength 65 MPa9.4 ksi · Fracture Toughness (K_IC) 4 MPa·√m3.6 ksi·√in · Hardness, Shore D 86 Shore D · Hardness, Rockwell R 120 HRR
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 175°C347 °F · Glass Transition (Tg) -60°C-76 °F · Water Absorption (24 h) 0.25% · Water Absorption (Saturation) 0.9%
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 0.31 W/m·K0.18 BTU/hr·ft·°F · Specific Heat Capacity 1,470 J/kg·K0.35 BTU/lb·°F · Max Service Temperature (continuous) 110°C230 °F · Min Service Temperature -50°C-58 °F · Heat Deflection Temp. @ 0.45 MPa 165°C329 °F · Vicat Softening Point (B50) 160°C320 °F · Limiting Oxygen Index 15% · Max Service Temperature (short-term) 140°C284 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹³ Ω·m3.94×10²⁰ µΩ·in · Dielectric Strength 20 kV/mm508 V/mil · Dielectric Constant (1 MHz) 3.7 · Dissipation Factor (1 MHz) 0.005 · Volume Resistivity 1×10¹⁵ Ω·cm · Surface Resistivity 1×10¹⁵ Ω · Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 72 / 100 · UV / Weathering Resistance 25 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Mold Shrinkage
Same in both: Weldability 40 / 100 · Formability (cold) 45 / 100 · Polishability 70 / 100 · Melt Flow Rate 13 g/10 min · Processing Melt Temperature (typ.) 215°C419 °F · Mold Temperature (typ.) 90°C194 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 103 MJ/kg44,282 BTU/lb · Embodied Carbon (primary production) 4.2 kg CO₂/kg · Embodied Water 200 L/kg24 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.
POM-H GF20 vs POM-H GF25 — frequently asked
Is POM-H GF25 stronger than POM-H GF20?
Yes. POM-H GF25 has a typical tensile strength of 125 MPa (18.1 ksi) against 105 MPa (15.2 ksi) for POM-H GF20 — about 19% more.
Which grade does FabDigit quote by default, GF20 or GF25?
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, POM-H GF20 or POM-H GF25?
POM-H GF20, by a small margin. Both rate good for machinability — 65/100 against 60/100 for POM-H GF25.
Ready to make it?
Upload a CAD file and FabDigit prices the part in POM-H GF20 and POM-H GF25 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.