PET-GF30 GF30 vs PET-GF30 GF30-IM
Polymer · PET-GF30 grade comparison
PET-GF30 GF30 and PET-GF30 GF30-IM are two grades of the same polymer grade, PET-GF30: GF30 (30% glass fiber, natural/standard injection grade) versus GF30-IM. The chemistry is identical, so every difference below comes from the condition. PET-GF30 GF30 is the stronger of the two: tensile strength 150 MPa (21.8 ksi) against 120 MPa (17.4 ksi) for PET-GF30 GF30-IM, about 25% more. In exchange, PET-GF30 GF30-IM is the more ductile: elongation 4% versus 2.5% for PET-GF30 GF30. PET-GF30 GF30 is stiffer (9.5 GPa vs 7.5 GPa). On the shop floor, PET-GF30 GF30-IM welds better (fair vs poor).
PET-GF30 GF30Choose it when strength drives the design.
PET-GF30 GF30-IMChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
PET-GF30 GF30 vs PET-GF30 GF30-IM: 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
Compressive Strength
Flexural Strength
Flexural Modulus
Shear Strength
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Same in both: Shear Modulus 3.4 GPa0.49 Msi · Poisson's Ratio 0.39 · Compressive Modulus 8.5 GPa1.2 Msi · Hardness, Rockwell R 120 HRR
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 255°C491 °F · Glass Transition (Tg) 79°C174 °F · Water Absorption (24 h) 0.12% · Water Absorption (Saturation) 0.45%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
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 1,200 J/kg·K0.29 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 25 µm/m·K13.9 µin/in·°F · Min Service Temperature -40°C-40 °F · Max Service Temperature (short-term) 220°C428 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dielectric Strength 28 kV/mm711 V/mil · Dielectric Constant (1 MHz) 3.8 · Dissipation Factor (1 MHz) 0.02 · Volume Resistivity 1×10¹⁶ Ω·cm · Surface Resistivity 1×10¹⁵ Ω · Comparative Tracking Index (CTI) 250 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 72 / 100 · UV / Weathering Resistance 30 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Mold Shrinkage
Same in both: Polishability 25 / 100 · Processing Melt Temperature (typ.) 280°C536 °F · Mold Temperature (typ.) 135°C275 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 80 MJ/kg34,394 BTU/lb · Embodied Carbon (primary production) 3.2 kg CO₂/kg · Embodied Water 80 L/kg9.6 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.
PET-GF30 GF30 vs PET-GF30 GF30-IM — frequently asked
Is PET-GF30 GF30 stronger than PET-GF30 GF30-IM?
Yes. PET-GF30 GF30 has a typical tensile strength of 150 MPa (21.8 ksi) against 120 MPa (17.4 ksi) for PET-GF30 GF30-IM — about 25% more.
Which grade does FabDigit quote by default, GF30 or GF30-IM?
GF30 is the default PET-GF30 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which welds better, PET-GF30 GF30 or PET-GF30 GF30-IM?
PET-GF30 GF30-IM. Its weldability rates fair (42/100) against poor (30/100) for PET-GF30 GF30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PET-GF30 GF30 and PET-GF30 GF30-IM 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.