FabDigit

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

Benchmark · 4 materials

Side-by-side benchmark of 4 glass grades.

IRG 24 vs N-SF11 and 2 more: properties

IRG 24N-SF11N-LaK9SF6

Mechanical

Strength, stiffness, ductility and hardness at room temperature.

Elastic (Young's) Modulus

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

Shear Modulus

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

Bulk Modulus

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

Poisson's Ratio

0.29
0.26
0.29
0.24

Tensile Strength (Ultimate)

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

Elongation at Break

0%
0%

Compressive Strength

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

Flexural Strength

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

Fracture Toughness (K_IC)

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

Hardness, Vickers

110 HV
470 HV
640 HV
350 HV

Hardness, Knoop

104 HK
450 HK
680 HK
310 HK

Hardness, Mohs

2.5
5.5
6
5

Shear Strength

35 MPa5.1 ksi

Physical

Density and transition temperatures.

Density

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

Refractive Index

2.79
1.785
1.691
1.805

Light Transmission

67%
100%
100%
84%

Same in both: Porosity 0%

Thermal

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

Thermal Conductivity

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

Specific Heat Capacity

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

Thermal Expansion (CTE, 20–100 °C)

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

Max Service Temperature (continuous)

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

Min Service Temperature

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

Electrical

Conductivity and insulation.

Electrical Resistivity

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

Dielectric Constant (1 MHz)

8.5
8.5
9

Volume Resistivity

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

Dielectric Strength

20 kV/mm508 V/mil

Dissipation Factor (1 MHz)

0.001

Chemical & Environmental

Corrosion and environmental resistance (0–100 scores).

Corrosion Resistance

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

Manufacturability

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

Machinability

85 / 100
15 / 100
12 / 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 kg CO₂/kg
4.5 kg CO₂/kg
3 kg CO₂/kg

Embodied Water

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

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

Specific Stiffness (E / density)

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

Thermal Diffusivity

0.1 mm²/s
0.4 mm²/s
0.5 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

CapabilityIRG 24N-SF11N-LaK9SF6
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 IRG 24 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.