LCP Type I GF15 vs LCP Type I GF40
Polymer · LCP Type I grade comparison
LCP Type I GF15 and LCP Type I GF40 are two grades of the same polymer grade, LCP Type I: 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 I GF40 is the stronger of the two: tensile strength 155 MPa (22.5 ksi) against 145 MPa (21 ksi) for LCP Type I GF15, about 7% more. In exchange, LCP Type I GF15 is the more ductile: elongation 2.2% versus 1.4% for LCP Type I GF40. LCP Type I GF15 is lighter (1.5 g/cm³ vs 1.72 g/cm³ for LCP Type I GF40) and LCP Type I GF40 is stiffer (20 GPa vs 13.5 GPa). On the shop floor, LCP Type I GF15 machines more easily (50 vs 38 out of 100).
LCP Type I GF15Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
LCP Type I GF40Choose it when strength drives the design.
LCP Type I GF15 vs LCP Type I 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 I GF15LCP Type I GF40
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Elongation at Break
Flexural Strength
Flexural Modulus
Izod Impact, Notched
Same in both: Shear Modulus 1.2 GPa0.17 Msi · Poisson's Ratio 0.38 · Compressive Strength 65 MPa9.4 ksi · Compressive Modulus 7 GPa1 Msi · Shear Strength 55 MPa8 ksi · Hardness, Shore D 88 Shore D · Hardness, Rockwell M 75 HRM
Physical
Density and transition temperatures.
Density
Same in both: Melting Temperature (Tm) 355°C671 °F · Glass Transition (Tg) 145°C293 °F · Water Absorption (24 h) 0.02% · Water Absorption (Saturation) 0.1%
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Heat Deflection Temp. @ 1.8 MPa
Same in both: Thermal Conductivity 0.3 W/m·K0.17 BTU/hr·ft·°F · Specific Heat Capacity 1,150 J/kg·K0.27 BTU/lb·°F · Max Service Temperature (continuous) 220°C428 °F · Min Service Temperature -100°C-148 °F · Heat Deflection Temp. @ 0.45 MPa 275°C527 °F · Limiting Oxygen Index 40% · Max Service Temperature (short-term) 300°C572 °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) 3.3 · 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 20 / 100 · Formability (cold) 20 / 100 · Polishability 45 / 100 · Processing Melt Temperature (typ.) 385°C725 °F · Mold Temperature (typ.) 120°C248 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 250 MJ/kg107,481 BTU/lb · Embodied Carbon (primary production) 9 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 I GF15 vs LCP Type I GF40 — frequently asked
Is LCP Type I GF40 stronger than LCP Type I GF15?
Yes. LCP Type I GF40 has a typical tensile strength of 155 MPa (22.5 ksi) against 145 MPa (21 ksi) for LCP Type I GF15 — about 7% more.
Which grade does FabDigit quote by default, GF15 or GF40?
UF is the default LCP Type I condition in the FabDigit quote flow (neither GF15 nor GF40). 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, LCP Type I GF15 or LCP Type I GF40?
LCP Type I GF15, by a small margin. Both rate fair for machinability — 50/100 against 38/100 for LCP Type I GF40.
Ready to make it?
Upload a CAD file and FabDigit prices the part in LCP Type I GF15 and LCP Type I 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.