SF11 vs SF6
Glass · grade comparison
SF11 and SF6 are both glass grades. SF11 is harder — 450 HV against 350 HV for SF6 — which matters for wear surfaces and threads. SF11 is lighter (4.74 g/cm³ vs 5.18 g/cm³ for SF6) and SF11 is stiffer (66 GPa vs 55 GPa). On the shop floor, SF11 machines more easily (25 vs 15 out of 100).
SF11Choose it when surface hardness matters, or when weight is the constraint.
SF11 vs SF6: 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
Elongation at Break
Compressive Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Same in both: Tensile Strength (Ultimate) 40 MPa5.8 ksi · Flexural Strength 55 MPa8 ksi · Hardness, Mohs 5
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
Dielectric Constant (1 MHz)
Volume Resistivity
Same in both: Dissipation Factor (1 MHz) 0.001
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 45 MJ/kg19,347 BTU/lb
Common Calculations
Ratios derived from the values above.
Specific Stiffness (E / density)
Thermal Diffusivity
Same in both: Specific Strength (UTS / density) 8 kN·m/kg · 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 | SF11 | SF6 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
SF11 vs SF6 — frequently asked
What is the difference between SF11 and SF6?
SF11 and SF6 are both glass grades. SF11 is harder — 450 HV against 350 HV for SF6 — which matters for wear surfaces and threads. SF11 is lighter (4.74 g/cm³ vs 5.18 g/cm³ for SF6) and SF11 is stiffer (66 GPa vs 55 GPa).
Which is cheaper, SF11 or SF6?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, SF11 or SF6?
SF11, by a small margin. Both rate poor for machinability — 25/100 against 15/100 for SF6.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SF11 and SF6 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.