PTT GF30 vs PTT MIN
Polymer · PTT grade comparison
PTT GF30 and PTT MIN are two grades of the same polymer grade, PTT: GF30 (30 % glass-fiber reinforced) versus MIN (mineral (talc) filled, 20–30 %). The chemistry is identical, so every difference below comes from the condition. PTT GF30 is the stronger of the two: yield strength 58 MPa (8.41 ksi) against 52 MPa (7.54 ksi) for PTT MIN, about 12% more; tensile strength follows at 138 MPa (20 ksi) vs 52 MPa (7.54 ksi). In exchange, PTT MIN is the more ductile: elongation 4% versus 2.5% for PTT GF30. PTT MIN is lighter (1.5 g/cm³ vs 1.55 g/cm³ for PTT GF30) and PTT GF30 is stiffer (9.5 GPa vs 4.3 GPa). On the shop floor, PTT MIN machines more easily (good vs fair) and PTT GF30 welds better (very good vs fair).
PTT GF30Choose it when strength drives the design, or when the part sees heat.
PTT MINChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PTT GF30 vs PTT MIN: 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
Shear Strength
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Hardness, Rockwell R
Same in both: Shear Modulus 0.95 GPa0.14 Msi · Bulk Modulus 5 GPa0.65 Msi · Poisson's Ratio 0.4 · Compressive Modulus 2.5 GPa0.36 Msi
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 228°C442 °F · Glass Transition (Tg) 50°C122 °F · Water Absorption (24 h) 0.15% · Water Absorption (Saturation) 0.4% · Refractive Index 1.6
Thermal
How each material carries heat and how hot it can run.
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: Thermal Conductivity 0.3 W/m·K0.17 BTU/hr·ft·°F · Specific Heat Capacity 1,350 J/kg·K0.32 BTU/lb·°F · Min Service Temperature -40°C-40 °F · Max Service Temperature (short-term) 140°C284 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Dielectric Strength 22 kV/mm559 V/mil · Dielectric Constant (1 MHz) 3.2 · Dissipation Factor (1 MHz) 0.018 · Volume Resistivity 1×10¹⁶ Ω·cm · Surface Resistivity 1×10¹⁵ Ω · Comparative Tracking Index (CTI) 600 V
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
Mold Temperature (typ.)
Same in both: Polishability 60 / 100 · Processing Melt Temperature (typ.) 250°C482 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 70 MJ/kg30,095 BTU/lb · Embodied Carbon (primary production) 3 kg CO₂/kg · Embodied Water 130 L/kg15.6 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.
PTT GF30 vs PTT MIN — frequently asked
Is PTT GF30 stronger than PTT MIN?
Yes. PTT GF30 has a typical yield strength of 58 MPa (8.41 ksi) against 52 MPa (7.54 ksi) for PTT MIN — about 12% more. Tensile strength is 138 MPa (20 ksi) vs 52 MPa (7.54 ksi).
Which grade does FabDigit quote by default, GF30 or MIN?
UNF is the default PTT condition in the FabDigit quote flow (neither GF30 nor MIN). 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 is easier to machine, PTT GF30 or PTT MIN?
PTT MIN. Its machinability rates good (58/100) against fair (45/100) for PTT GF30; for welding the order is PTT GF30 first (very good, 70/100) then PTT MIN (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in PTT GF30 and PTT MIN 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.