RPET GF30 vs RPET STRAP
Polymer · RPET grade comparison
RPET GF30 and RPET STRAP are two grades of the same polymer grade, RPET: GF30 (30% glass-fibre reinforced, heat-stabilized rPET compound) versus STRAP (strapping / high-IV extrusion grade). The chemistry is identical, so every difference below comes from the condition. RPET STRAP is the stronger of the two: yield strength 58 MPa (8.41 ksi) against 52 MPa (7.54 ksi) for RPET GF30, about 12% more. RPET STRAP is the more ductile: elongation 100% versus 2.5% for RPET GF30. RPET STRAP is lighter (1.37 g/cm³ vs 1.57 g/cm³ for RPET GF30) and RPET GF30 is stiffer (9 GPa vs 2.8 GPa). On the shop floor, RPET STRAP machines more easily (good vs fair).
RPET GF30Choose it when the part sees heat.
RPET STRAPChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
RPET GF30 vs RPET STRAP: 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
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Hardness, Rockwell R
Same in both: Shear Modulus 0.95 GPa0.14 Msi · Bulk Modulus 4 GPa0.58 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) 250°C482 °F · Glass Transition (Tg) 78°C172 °F · Water Absorption (24 h) 0.2% · Water Absorption (Saturation) 0.55% · Refractive Index 1.575 · Light Transmission 86%
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)
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 · 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 STRAP — frequently asked
Is RPET STRAP stronger than RPET GF30?
Yes. RPET STRAP has a typical yield strength of 58 MPa (8.41 ksi) against 52 MPa (7.54 ksi) for RPET GF30 — about 12% more. Tensile strength is 62 MPa (8.99 ksi) vs 130 MPa (18.9 ksi).
Which grade does FabDigit quote by default, GF30 or STRAP?
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 STRAP?
RPET STRAP. 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 STRAP 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.