LCP Type III GF15 vs LCP Type III GF40
Polymer · LCP Type III grade comparison
LCP Type III GF15 and LCP Type III GF40 are two grades of the same polymer grade, LCP Type III: GF15 (15 % glass-fibre reinforced) versus GF40 (40 % glass-fibre reinforced). The chemistry is identical, so every difference below comes from the condition. LCP Type III GF40 is the stronger of the two: tensile strength 170 MPa (24.7 ksi) against 155 MPa (22.5 ksi) for LCP Type III GF15, about 10% more. In exchange, LCP Type III GF15 is the more ductile: elongation 2.5% versus 1.5% for LCP Type III GF40. LCP Type III GF15 is lighter (1.52 g/cm³ vs 1.72 g/cm³ for LCP Type III GF40). On the shop floor, LCP Type III GF15 machines more easily (48 vs 35 out of 100).
LCP Type III GF15Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
LCP Type III GF40Choose it when strength drives the design.
LCP Type III GF15 vs LCP Type III GF40: 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.
LCP Type III GF15LCP Type III GF40
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Elongation at Break
Flexural Strength
Flexural Modulus
Izod Impact, Notched
Same in both: Elastic (Young's) Modulus 10 GPa1.5 Msi · Shear Modulus 1.2 GPa0.17 Msi · Poisson's Ratio 0.36 · Compressive Strength 65 MPa9.4 ksi · Shear Strength 55 MPa8 ksi · Hardness, Shore D 88 Shore D · Hardness, Rockwell M 72 HRM
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 285°C545 °F · Glass Transition (Tg) 105°C221 °F · Water Absorption (24 h) 0.02% · Water Absorption (Saturation) 0.06%
Thermal
How each material carries heat and how hot it can run.
Heat Deflection Temp. @ 1.8 MPa
Same in both: Thermal Conductivity 0.3 W/m·K0.17 BTU/hr·ft·°F · Specific Heat Capacity 1,200 J/kg·K0.29 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10 µm/m·K5.6 µin/in·°F · Max Service Temperature (continuous) 170°C338 °F · Min Service Temperature -50°C-58 °F · Heat Deflection Temp. @ 0.45 MPa 225°C437 °F · Limiting Oxygen Index 38% · Max Service Temperature (short-term) 230°C446 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹³ Ω·m3.94×10²⁰ µΩ·in · Dielectric Strength 35 kV/mm889 V/mil · Dielectric Constant (1 MHz) 3.4 · Dissipation Factor (1 MHz) 0.004 · Volume Resistivity 1×10¹⁵ Ω·cm · Surface Resistivity 1×10¹⁵ Ω · Comparative Tracking Index (CTI) 200 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 92 / 100 · UV / Weathering Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Mold Shrinkage
Same in both: Weldability 30 / 100 · Formability (cold) 20 / 100 · Polishability 40 / 100 · Melt Flow Rate 40 g/10 min · Processing Melt Temperature (typ.) 310°C590 °F · Mold Temperature (typ.) 90°C194 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 180 MJ/kg77,386 BTU/lb · Embodied Carbon (primary production) 8.5 kg CO₂/kg · Embodied Water 300 L/kg35.9 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.
LCP Type III GF15 vs LCP Type III GF40 — frequently asked
Is LCP Type III GF40 stronger than LCP Type III GF15?
Yes. LCP Type III GF40 has a typical tensile strength of 170 MPa (24.7 ksi) against 155 MPa (22.5 ksi) for LCP Type III GF15 — about 10% more.
Which grade does FabDigit quote by default, GF15 or GF40?
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, LCP Type III GF15 or LCP Type III GF40?
LCP Type III GF15, by a small margin. Both rate fair for machinability — 48/100 against 35/100 for LCP Type III GF40.
Ready to make it?
Upload a CAD file and FabDigit prices the part in LCP Type III GF15 and LCP Type III GF40 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.