PC-Si GF30 vs PC-Si LT
Polymer · PC-Si grade comparison
PC-Si GF30 and PC-Si LT are two grades of the same polymer grade, PC-Si: GF30 (30% glass-fiber reinforced PC-Si) versus LT (ultra-low-temperature impact grade). The chemistry is identical, so every difference below comes from the condition. PC-Si GF30 is the stronger of the two: yield strength 58 MPa (8.41 ksi) against 53 MPa (7.69 ksi) for PC-Si LT, about 9% more; tensile strength follows at 112 MPa (16.2 ksi) vs 55 MPa (7.98 ksi). In exchange, PC-Si LT is the more ductile: elongation 130% versus 3.5% for PC-Si GF30. PC-Si LT is lighter (1.19 g/cm³ vs 1.43 g/cm³ for PC-Si GF30) and PC-Si GF30 is stiffer (7.2 GPa vs 2.1 GPa). On the shop floor, PC-Si LT machines more easily (good vs fair).
PC-Si GF30Choose it when strength drives the design.
PC-Si LTChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
PC-Si GF30 vs PC-Si LT: 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 M
Hardness, Rockwell R
Same in both: Shear Modulus 0.8 GPa0.12 Msi · Bulk Modulus 3 GPa0.49 Msi · Poisson's Ratio 0.38 · Compressive Modulus 2.1 GPa0.3 Msi
Physical
Density and transition temperatures.
Density
Glass Transition (Tg)
Same in both: Water Absorption (24 h) 0.15% · Water Absorption (Saturation) 0.35% · Refractive Index 1.585
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
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 1,200 J/kg·K0.29 BTU/lb·°F · Max Service Temperature (short-term) 145°C293 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹⁴ Ω·m3.94×10²¹ µΩ·in · Dielectric Strength 25 kV/mm635 V/mil · Dielectric Constant (1 MHz) 2.9 · Dissipation Factor (1 MHz) 0.01 · Volume Resistivity 1×10¹⁶ Ω·cm · Surface Resistivity 1×10¹⁵ Ω · Comparative Tracking Index (CTI) 250 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 75 / 100 · UV / Weathering Resistance 40 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Mold Shrinkage
Same in both: Weldability 70 / 100 · Polishability 80 / 100 · Melt Flow Rate 8 g/10 min · Processing Melt Temperature (typ.) 290°C554 °F · Mold Temperature (typ.) 90°C194 °F
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 112 MJ/kg48,151 BTU/lb · Embodied Carbon (primary production) 7.8 kg CO₂/kg · Embodied Water 250 L/kg30 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.
PC-Si GF30 vs PC-Si LT — frequently asked
Is PC-Si GF30 stronger than PC-Si LT?
Yes. PC-Si GF30 has a typical yield strength of 58 MPa (8.41 ksi) against 53 MPa (7.69 ksi) for PC-Si LT — about 9% more. Tensile strength is 112 MPa (16.2 ksi) vs 55 MPa (7.98 ksi).
Which grade does FabDigit quote by default, GF30 or LT?
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, PC-Si GF30 or PC-Si LT?
PC-Si LT. Its machinability rates good (58/100) against fair (45/100) for PC-Si GF30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in PC-Si GF30 and PC-Si LT 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.