PET-GF30 vs PETG
Polymer · grade comparison
PET-GF30 and PETG are both polymer grades. PET-GF30 is the stronger of the two: tensile strength 150 MPa (21.8 ksi) against 50 MPa (7.25 ksi) for PETG, about 3.0 times as much. In exchange, PETG is the more ductile: elongation 120% versus 2.5% for PET-GF30, and PET-GF30 is harder (90 Shore D vs 78 Shore D). PETG is lighter (1.27 g/cm³ vs 1.56 g/cm³ for PET-GF30) and PET-GF30 is stiffer (9.5 GPa vs 2.1 GPa). On the shop floor, PETG machines more easily (good vs fair), PETG welds better (very good vs poor), and PETG sits in a lower cost tier (budget, $) than PET-GF30 (standard, $$).
PET-GF30Choose it when strength drives the design, or when the part sees heat.
PETGChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PET-GF30 vs PETG: 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
Shear Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Hardness, Rockwell R
Yield Strength (0.2% offset)
Physical
Density and transition temperatures.
Density
Melting Temperature (Tm)
Glass Transition (Tg)
Water Absorption (24 h)
Water Absorption (Saturation)
Refractive Index
Light Transmission
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)
Max Service Temperature (short-term)
Same in both: Specific Heat Capacity 1,200 J/kg·K0.29 BTU/lb·°F · Min Service Temperature -40°C-40 °F · Limiting Oxygen Index 23%
Electrical
Conductivity and insulation.
Dielectric Strength
Dielectric Constant (1 MHz)
Surface Resistivity
Comparative Tracking Index (CTI)
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dissipation Factor (1 MHz) 0.02 · Volume Resistivity 1×10¹⁶ Ω·cm
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
Processing Melt Temperature (typ.)
Mold Temperature (typ.)
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Water
Same in both: Embodied Carbon (primary production) 3.2 kg CO₂/kg · Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Diffusivity
Same in both: 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 | PET-GF30 | PETG |
|---|---|---|
| CNC machining | — | Yes |
| Sheet metal | — | Yes |
| Injection molding | — | Yes |
| 3D printing | — | Yes |
| Default condition | — | Unfilled |
| Relative cost | $$ Standard | $ Budget |
| Min. machined wall | — | 0.5 mm |
| Best machined surface | — | Ra 0.8 µm |
| Chrome Plating (Plastic) | — | Yes |
| Conductive Coating | — | Yes |
| Dyeing (Nylon) | — | Yes |
| EMI Shielding Coating | — | Yes |
| Painting | — | Yes |
| Primer Coating | — | Yes |
| Soft Touch Coating | — | Yes |
| Spray Painting | — | Yes |
| Tinted Coating | — | Yes |
| UV Coating | — | Yes |
| Vacuum Metallization | — | Yes |
| Waterproof Coating | — | Yes |
PET-GF30 vs PETG — frequently asked
Is PET-GF30 stronger than PETG?
Yes. PET-GF30 has a typical tensile strength of 150 MPa (21.8 ksi) against 50 MPa (7.25 ksi) for PETG — about 3.0 times as much.
Which is cheaper, PET-GF30 or PETG?
PETG is the lower-cost material: it sits in the budget tier ($) while PET-GF30 is standard ($$). 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, PET-GF30 or PETG?
PETG. Its machinability rates good (65/100) against fair (45/100) for PET-GF30; for welding the order is PETG first (very good, 80/100) then PET-GF30 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PET-GF30 and PETG 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.