Borofloat 33 vs Duran
Glass · grade comparison
Borofloat 33 and Duran are both glass grades. Duran is harder — 580 HV against 480 HV for Borofloat 33 — which matters for wear surfaces and threads. On the shop floor, Borofloat 33 sits in a lower cost tier (standard, $$) than Duran (premium, $$$).
Borofloat 33Choose it when cost is the deciding factor.
DuranChoose it when surface hardness matters.
Borofloat 33 vs Duran: 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.
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Mohs
Same in both: Elastic (Young's) Modulus 64 GPa9.3 Msi · Shear Modulus 26.7 GPa3.9 Msi · Bulk Modulus 36 GPa5.2 Msi · Poisson's Ratio 0.2 · Tensile Strength (Ultimate) 35 MPa5.1 ksi · Elongation at Break 0% · Compressive Strength 1,000 MPa145 ksi · Hardness, Knoop 480 HK
Physical
Density and transition temperatures.
Refractive Index
Same in both: Density 2.23 g/cm³0.08 lb/in³ · Light Transmission 92% · Porosity 0%
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Min Service Temperature
Same in both: Thermal Conductivity 1.2 W/m·K0.69 BTU/hr·ft·°F · Specific Heat Capacity 830 J/kg·K0.2 BTU/lb·°F · Max Service Temperature (continuous) 450°C842 °F
Electrical
Conductivity and insulation.
Dielectric Strength
Same in both: Electrical Resistivity 1×10¹³ Ω·m3.94×10²⁰ µΩ·in · Dielectric Constant (1 MHz) 4.6 · Dissipation Factor (1 MHz) 0.0037 · Volume Resistivity 1×10¹⁵ Ω·cm
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 92 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Polishability 95 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Typical Recycled Content
Same in both: Embodied Carbon (primary production) 1.8 kg CO₂/kg · Embodied Water 15 L/kg1.8 gal/lb
Common Calculations
Ratios derived from the values above.
Same in both: Specific Strength (UTS / density) 16 kN·m/kg · Specific Stiffness (E / density) 28.7 MN·m/kg · Thermal Diffusivity 0.6 mm²/s · 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 | Borofloat 33 | Duran |
|---|---|---|
| Default condition | Annealed Glass | — |
| Relative cost | $$ Standard | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Borofloat 33 vs Duran — frequently asked
What is the difference between Borofloat 33 and Duran?
Borofloat 33 and Duran are both glass grades. Duran is harder — 580 HV against 480 HV for Borofloat 33 — which matters for wear surfaces and threads. On the shop floor, Borofloat 33 sits in a lower cost tier (standard, $$) than Duran (premium, $$$).
Which is cheaper, Borofloat 33 or Duran?
Borofloat 33 is the lower-cost material: it sits in the standard tier ($$) while Duran is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
When should I choose Borofloat 33 over Duran?
Pick Borofloat 33 when cost is the deciding factor. Pick Duran when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Borofloat 33 and Duran 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.