N-LaK9 vs SF11
Glass · grade comparison
N-LaK9 and SF11 are both glass grades. N-LaK9 is the stronger of the two: tensile strength 55 MPa (7.98 ksi) against 40 MPa (5.8 ksi) for SF11, about 38% more. N-LaK9 is harder — 640 HV against 450 HV for SF11 — which matters for wear surfaces and threads. N-LaK9 is lighter (3.51 g/cm³ vs 4.74 g/cm³ for SF11) and N-LaK9 is stiffer (110 GPa vs 66 GPa). On the shop floor, SF11 machines more easily (poor vs not recommended).
N-LaK9Choose it when strength drives the design, or when surface hardness matters.
SF11Choose it when the part is machined in volume.
N-LaK9 vs SF11: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all glass 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 glass 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
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Compressive Strength
Flexural Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Hardness, Mohs
Elongation at Break
Physical
Density and transition temperatures.
Density
Refractive Index
Light Transmission
Same in both: Porosity 0%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dissipation Factor (1 MHz)
Same in both: Dielectric Constant (1 MHz) 8.5 · Volume Resistivity 1×10¹⁴ Ω·cm
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 120 L/kg14.4 gal/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Diffusivity
Same in both: Thermal Shock Resistance Index 0
Strength versus weight
Yield strength against density for every glass grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | N-LaK9 | SF11 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
N-LaK9 vs SF11 — frequently asked
Is N-LaK9 stronger than SF11?
Yes. N-LaK9 has a typical tensile strength of 55 MPa (7.98 ksi) against 40 MPa (5.8 ksi) for SF11 — about 38% more.
Which is cheaper, N-LaK9 or SF11?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, N-LaK9 or SF11?
SF11. Its machinability rates poor (25/100) against not recommended (12/100) for N-LaK9.
Ready to make it?
Upload a CAD file and FabDigit prices the part in N-LaK9 and SF11 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.