RPET GF30 vs RPET PIR
Polymer · RPET grade comparison
RPET GF30 and RPET PIR are two grades of the same polymer grade, RPET: GF30 (30% glass-fibre reinforced, heat-stabilized rPET compound) versus PIR (post-industrial recycled rPET). The chemistry is identical, so every difference below comes from the condition. RPET PIR is the stronger of the two: yield strength 55 MPa (7.98 ksi) against 52 MPa (7.54 ksi) for RPET GF30, about 6% more. RPET PIR is the more ductile: elongation 80% versus 2.5% for RPET GF30. RPET PIR is lighter (1.37 g/cm³ vs 1.57 g/cm³ for RPET GF30) and RPET GF30 is stiffer (9 GPa vs 2.7 GPa). On the shop floor, RPET PIR machines more easily (good vs fair).
RPET GF30Choose it when the part sees heat.
RPET PIRChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
RPET GF30 vs RPET PIR: 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
Flexural Strength
Flexural Modulus
Izod Impact, Notched
Same in both: Shear Modulus 0.95 GPa0.14 Msi · Bulk Modulus 4 GPa0.58 Msi · Poisson's Ratio 0.4 · Compressive Strength 85 MPa12.3 ksi · Compressive Modulus 2.5 GPa0.36 Msi · Shear Strength 50 MPa7.3 ksi · Fracture Toughness (K_IC) 4.5 MPa·√m4.1 ksi·√in · Hardness, Shore D 82 Shore D · Hardness, Rockwell M 96 HRM · Hardness, Rockwell R 118 HRR
Physical
Density and transition temperatures.
Density
Light Transmission
Same in both: Melting Temperature (Tm) 250°C482 °F · Glass Transition (Tg) 78°C172 °F · Water Absorption (24 h) 0.2% · Water Absorption (Saturation) 0.55% · Refractive Index 1.575
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
Same in both: Thermal Conductivity 0.2 W/m·K0.12 BTU/hr·ft·°F · Specific Heat Capacity 1,200 J/kg·K0.29 BTU/lb·°F · Min Service Temperature -40°C-40 °F · Vicat Softening Point (B50) 80°C176 °F · Limiting Oxygen Index 21% · Max Service Temperature (short-term) 110°C230 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dielectric Strength 20 kV/mm508 V/mil · Dielectric Constant (1 MHz) 3.2 · Dissipation Factor (1 MHz) 0.02 · Volume Resistivity 1×10¹⁶ Ω·cm · Surface Resistivity 1×10¹⁵ Ω
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 35 / 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.) 275°C527 °F
Sustainability
Primary-production footprint per kilogram.
Typical Recycled Content
Same in both: Embodied Energy (primary production) 35 MJ/kg15,047 BTU/lb · Embodied Carbon (primary production) 1.5 kg CO₂/kg · Embodied Water 30 L/kg3.6 gal/lb
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.
RPET GF30 vs RPET PIR — frequently asked
Is RPET PIR stronger than RPET GF30?
Yes. RPET PIR has a typical yield strength of 55 MPa (7.98 ksi) against 52 MPa (7.54 ksi) for RPET GF30 — about 6% more. Tensile strength is 58 MPa (8.41 ksi) vs 130 MPa (18.9 ksi).
Which grade does FabDigit quote by default, GF30 or PIR?
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, RPET GF30 or RPET PIR?
RPET PIR. Its machinability rates good (55/100) against fair (40/100) for RPET GF30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in RPET GF30 and RPET PIR 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.