FabDigit

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

Benchmark · 4 materials

Side-by-side benchmark of 4 glass grades.

SF11 vs N-SF11 and 2 more: properties

SF11N-SF11N-LaK9IRG 24

Mechanical

Strength, stiffness, ductility and hardness at room temperature.

Elastic (Young's) Modulus

66 GPa9.6 Msi
92 GPa13.3 Msi
110 GPa16 Msi
18.3 GPa2.7 Msi

Shear Modulus

26.7 GPa3.9 Msi
36.6 GPa5.3 Msi
42.7 GPa6.2 Msi
7.1 GPa1 Msi

Bulk Modulus

42 GPa6 Msi
63 GPa9.1 Msi
86 GPa12.5 Msi
14 GPa2.1 Msi

Poisson's Ratio

0.24
0.26
0.29
0.29

Tensile Strength (Ultimate)

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

Elongation at Break

0%
0%
0%

Compressive Strength

800 MPa116 ksi
900 MPa131 ksi
1,000 MPa145 ksi
200 MPa29 ksi

Flexural Strength

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

Fracture Toughness (K_IC)

0.65 MPa·√m0.59 ksi·√in
0.7 MPa·√m0.64 ksi·√in
0.8 MPa·√m0.73 ksi·√in
0.17 MPa·√m0.15 ksi·√in

Hardness, Vickers

450 HV
470 HV
640 HV
110 HV

Hardness, Knoop

450 HK
450 HK
680 HK
104 HK

Hardness, Mohs

5
5.5
6
2.5

Shear Strength

35 MPa5.1 ksi

Physical

Density and transition temperatures.

Density

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

Refractive Index

1.785
1.785
1.691
2.79

Light Transmission

85%
100%
100%
67%

Same in both: Porosity 0%

Thermal

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

Thermal Conductivity

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

Specific Heat Capacity

431 J/kg·K0.1 BTU/lb·°F
630 J/kg·K0.15 BTU/lb·°F
510 J/kg·K0.12 BTU/lb·°F
340 J/kg·K0.08 BTU/lb·°F

Thermal Expansion (CTE, 20–100 °C)

6.1 µm/m·K3.4 µin/in·°F
8.5 µm/m·K4.7 µin/in·°F
6.3 µm/m·K3.5 µin/in·°F
20.7 µm/m·K11.5 µin/in·°F

Max Service Temperature (continuous)

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

Min Service Temperature

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

Electrical

Conductivity and insulation.

Electrical Resistivity

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

Dielectric Strength

15 kV/mm381 V/mil

Dielectric Constant (1 MHz)

8.5
8.5
8.5

Dissipation Factor (1 MHz)

0.001

Volume Resistivity

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

Chemical & Environmental

Corrosion and environmental resistance (0–100 scores).

Corrosion Resistance

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

Manufacturability

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

Machinability

25 / 100
15 / 100
12 / 100
85 / 100

Polishability

95 / 100
85 / 100
85 / 100
85 / 100

Sustainability

Primary-production footprint per kilogram.

Embodied Energy (primary production)

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

Embodied Carbon (primary production)

3.2 kg CO₂/kg
4 kg CO₂/kg
4.5 kg CO₂/kg

Embodied Water

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

Typical Recycled Content

5%
20%
20%

Common Calculations

Ratios derived from the values above.

Specific Strength (UTS / density)

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

Specific Stiffness (E / density)

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

Thermal Diffusivity

0.4 mm²/s
0.4 mm²/s
0.5 mm²/s
0.1 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

CapabilitySF11N-SF11N-LaK9IRG 24
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 SF11 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.