FabDigit

N-LaK9 vs N-SF11 vs IRG 24 vs SF6

Benchmark · 4 materials

Side-by-side benchmark of 4 glass grades.

N-LaK9 vs N-SF11 and 2 more: properties

N-LaK9N-SF11IRG 24SF6

Mechanical

Strength, stiffness, ductility and hardness at room temperature.

Elastic (Young's) Modulus

110 GPa16 Msi
92 GPa13.3 Msi
18.3 GPa2.7 Msi
55 GPa8 Msi

Shear Modulus

42.7 GPa6.2 Msi
36.6 GPa5.3 Msi
7.1 GPa1 Msi
22 GPa3.2 Msi

Bulk Modulus

86 GPa12.5 Msi
63 GPa9.1 Msi
14 GPa2.1 Msi
36 GPa5.2 Msi

Poisson's Ratio

0.29
0.26
0.29
0.24

Tensile Strength (Ultimate)

55 MPa8 ksi
45 MPa6.5 ksi
16 MPa2.3 ksi
40 MPa5.8 ksi

Compressive Strength

1,000 MPa145 ksi
900 MPa131 ksi
200 MPa29 ksi
900 MPa131 ksi

Flexural Strength

70 MPa10.2 ksi
60 MPa8.7 ksi
18 MPa2.6 ksi
55 MPa8 ksi

Fracture Toughness (K_IC)

0.8 MPa·√m0.73 ksi·√in
0.7 MPa·√m0.64 ksi·√in
0.17 MPa·√m0.15 ksi·√in
0.6 MPa·√m0.55 ksi·√in

Hardness, Vickers

640 HV
470 HV
110 HV
350 HV

Hardness, Knoop

680 HK
450 HK
104 HK
310 HK

Hardness, Mohs

6
5.5
2.5
5

Elongation at Break

0%
0%

Shear Strength

35 MPa5.1 ksi

Physical

Density and transition temperatures.

Density

3.51 g/cm³0.13 lb/in³
3.2 g/cm³0.12 lb/in³
4.64 g/cm³0.17 lb/in³
5.18 g/cm³0.19 lb/in³

Refractive Index

1.691
1.785
2.79
1.805

Light Transmission

100%
100%
67%
84%

Same in both: Porosity 0%

Thermal

How each material carries heat and how hot it can run.

Thermal Conductivity

0.9 W/m·K0.52 BTU/hr·ft·°F
0.75 W/m·K0.43 BTU/hr·ft·°F
0.2 W/m·K0.12 BTU/hr·ft·°F
0.67 W/m·K0.39 BTU/hr·ft·°F

Specific Heat Capacity

510 J/kg·K0.12 BTU/lb·°F
630 J/kg·K0.15 BTU/lb·°F
340 J/kg·K0.08 BTU/lb·°F
389 J/kg·K0.09 BTU/lb·°F

Thermal Expansion (CTE, 20–100 °C)

6.3 µm/m·K3.5 µin/in·°F
8.5 µm/m·K4.7 µin/in·°F
20.7 µm/m·K11.5 µin/in·°F
8.1 µm/m·K4.5 µin/in·°F

Max Service Temperature (continuous)

500°C932 °F
400°C752 °F
120°C248 °F
350°C662 °F

Min Service Temperature

-60°C-76 °F
-200°C-328 °F
-100°C-148 °F
-100°C-148 °F

Electrical

Conductivity and insulation.

Dielectric Constant (1 MHz)

8.5
8.5
9

Volume Resistivity

1×10¹⁴ Ω·cm
1×10¹⁴ Ω·cm
1×10¹³ Ω·cm
1×10¹³ Ω·cm

Electrical Resistivity

1×10¹² Ω·m3.94×10¹⁹ µΩ·in
1×10¹¹ Ω·m3.94×10¹⁸ µΩ·in
1×10¹¹ Ω·m3.94×10¹⁸ µΩ·in

Dielectric Strength

20 kV/mm508 V/mil

Dissipation Factor (1 MHz)

0.001

Chemical & Environmental

Corrosion and environmental resistance (0–100 scores).

Corrosion Resistance

62 / 100
60 / 100
55 / 100
45 / 100

Manufacturability

FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.

Machinability

12 / 100
15 / 100
85 / 100
15 / 100

Polishability

85 / 100
85 / 100
85 / 100
88 / 100

Sustainability

Primary-production footprint per kilogram.

Embodied Energy (primary production)

60 MJ/kg25,795 BTU/lb
60 MJ/kg25,795 BTU/lb
45 MJ/kg19,347 BTU/lb

Embodied Carbon (primary production)

4.5 kg CO₂/kg
4 kg CO₂/kg
3 kg CO₂/kg

Embodied Water

120 L/kg14.4 gal/lb
30 L/kg3.6 gal/lb
80 L/kg9.6 gal/lb

Typical Recycled Content

20%
20%
10%

Common Calculations

Ratios derived from the values above.

Specific Strength (UTS / density)

16 kN·m/kg
14 kN·m/kg
3 kN·m/kg
8 kN·m/kg

Specific Stiffness (E / density)

31.3 MN·m/kg
28.8 MN·m/kg
3.9 MN·m/kg
10.6 MN·m/kg

Thermal Diffusivity

0.5 mm²/s
0.4 mm²/s
0.1 mm²/s
0.3 mm²/s

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.

501002005002.533.5Density (g/cm³)Yield strength (MPa) — log scale

Manufacturing and finishing

CapabilityN-LaK9N-SF11IRG 24SF6
Default condition
Relative cost$$$$ High$$$$ High$$$$ High$$$$ High
Min. machined wall
Best machined surface

Ready to make it?

Upload a CAD file and FabDigit prices the part in N-LaK9 and N-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.