Pyrex 7740 ANN vs Pyrex 7740 CS
Glass · Pyrex 7740 temper comparison
Pyrex 7740 ANN and Pyrex 7740 CS are two conditions of the same glass grade, Pyrex 7740: ANN (annealed) versus CS (chemically strengthened (ion-exchanged) borosilicate). The chemistry is identical, so every difference below comes from the condition. Pyrex 7740 CS is the stronger of the two: tensile strength 70 MPa (10.2 ksi) against 35 MPa (5.08 ksi) for Pyrex 7740 ANN, about 100% more. Pyrex 7740 CS is harder — 520 HV against 480 HV for Pyrex 7740 ANN — which matters for wear surfaces and threads. Pyrex 7740 CS runs hotter in service (250°C vs 230°C continuous).
Pyrex 7740 CSChoose it when strength drives the design, or when surface hardness matters.
Pyrex 7740 ANN vs Pyrex 7740 CS: 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.
Tensile Strength (Ultimate)
Flexural Strength
Hardness, Vickers
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 · Elongation at Break 0% · Compressive Strength 1,000 MPa145 ksi · Fracture Toughness (K_IC) 0.75 MPa·√m0.68 ksi·√in · Hardness, Knoop 418 HK · Hardness, Mohs 5.5
Physical
Density and transition temperatures.
Same in both: Density 2.23 g/cm³0.08 lb/in³ · Refractive Index 1.474 · Light Transmission 92% · Porosity 0%
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 1.1 W/m·K0.66 BTU/hr·ft·°F · Specific Heat Capacity 830 J/kg·K0.2 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 3.3 µm/m·K1.8 µin/in·°F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1×10¹³ Ω·m3.94×10²⁰ µΩ·in · Dielectric Strength 20 kV/mm508 V/mil · 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).
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Polishability 96 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.7 kg CO₂/kg · Embodied Water 250 L/kg30 gal/lb · Typical Recycled Content 10%
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.
Pyrex 7740 ANN vs Pyrex 7740 CS — frequently asked
Is Pyrex 7740 CS stronger than Pyrex 7740 ANN?
Yes. Pyrex 7740 CS has a typical tensile strength of 70 MPa (10.2 ksi) against 35 MPa (5.08 ksi) for Pyrex 7740 ANN — about 100% more.
Which condition does FabDigit quote by default, ANN or CS?
ANN is the default Pyrex 7740 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, Pyrex 7740 ANN or Pyrex 7740 CS?
Pyrex 7740 ANN, by a small margin. Both rate not recommended for machinability — 12/100 against 5/100 for Pyrex 7740 CS.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Pyrex 7740 ANN and Pyrex 7740 CS 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.