RTPU FR vs RTPU GF30
Polymer · RTPU grade comparison
RTPU FR and RTPU GF30 are two grades of the same polymer grade, RTPU: FR (flame-retardant (UL 94 V-0) grade) versus GF30 (30 % glass-fibre reinforced). The chemistry is identical, so every difference below comes from the condition. RTPU GF30 is the stronger of the two: yield strength 52 MPa (7.54 ksi) against 46 MPa (6.67 ksi) for RTPU FR, about 13% more; tensile strength follows at 115 MPa (16.7 ksi) vs 50 MPa (7.25 ksi). In exchange, RTPU FR is the more ductile: elongation 80% versus 5% for RTPU GF30. RTPU FR is lighter (1.3 g/cm³ vs 1.43 g/cm³ for RTPU GF30) and RTPU GF30 is stiffer (8 GPa vs 2.3 GPa). On the shop floor, RTPU FR machines more easily (good vs fair).
RTPU FRChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
RTPU GF30Choose it when strength drives the design, or when the part sees heat.
RTPU FR vs RTPU GF30: 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 R
Same in both: Poisson's Ratio 0.4 · Compressive Modulus 2 GPa0.29 Msi
Physical
Density and transition temperatures.
Density
Same in both: Glass Transition (Tg) 100°C212 °F · Water Absorption (24 h) 0.3% · Water Absorption (Saturation) 1.3% · Refractive Index 1.55 · Light Transmission 85%
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)
Limiting Oxygen Index
Same in both: Specific Heat Capacity 1,600 J/kg·K0.38 BTU/lb·°F · Min Service Temperature -40°C-40 °F · Max Service Temperature (short-term) 110°C230 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹² Ω·m3.94×10¹⁹ µΩ·in · Dielectric Strength 24 kV/mm610 V/mil · Dielectric Constant (1 MHz) 4 · Dissipation Factor (1 MHz) 0.03 · Volume Resistivity 1×10¹⁴ Ω·cm · Surface Resistivity 1×10¹⁴ Ω · Comparative Tracking Index (CTI) 600 V
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
Same in both: Polishability 60 / 100 · Processing Melt Temperature (typ.) 215°C419 °F · Mold Temperature (typ.) 40°C104 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 118 MJ/kg50,731 BTU/lb · Embodied Carbon (primary production) 5.5 kg CO₂/kg · Embodied Water 260 L/kg31.2 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.
RTPU FR vs RTPU GF30 — frequently asked
Is RTPU GF30 stronger than RTPU FR?
Yes. RTPU GF30 has a typical yield strength of 52 MPa (7.54 ksi) against 46 MPa (6.67 ksi) for RTPU FR — about 13% more. Tensile strength is 115 MPa (16.7 ksi) vs 50 MPa (7.25 ksi).
Which grade does FabDigit quote by default, FR or GF30?
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, RTPU FR or RTPU GF30?
RTPU FR. Its machinability rates good (58/100) against fair (45/100) for RTPU GF30; for welding the order is RTPU GF30 first (very good, 70/100) then RTPU FR (good, 62/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in RTPU FR and RTPU GF30 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.