JGS1 vs ZERODUR
Glass · grade comparison
JGS1 and ZERODUR are both glass grades. JGS1 is the stronger of the two: tensile strength 50 MPa (7.25 ksi) against 30 MPa (4.35 ksi) for ZERODUR, about 67% more. JGS1 is harder — 750 HV against 620 HV for ZERODUR — which matters for wear surfaces and threads. JGS1 is lighter (2.2 g/cm³ vs 2.53 g/cm³ for ZERODUR) and ZERODUR is stiffer (90.3 GPa vs 72 GPa). On the shop floor, ZERODUR sits in a lower cost tier (standard, $$) than JGS1 (high, $$$$).
JGS1Choose it when strength drives the design, or when surface hardness matters.
ZERODURChoose it when cost is the deciding factor.
JGS1 vs ZERODUR: 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
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Hardness, Mohs
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
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)
Dissipation Factor (1 MHz)
Volume Resistivity
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
Polishability
Sintering / Firing Temperature
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Diffusivity
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 | JGS1 | ZERODUR |
|---|---|---|
| Default condition | — | Annealed Glass |
| Relative cost | $$$$ High | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
JGS1 vs ZERODUR — frequently asked
Is JGS1 stronger than ZERODUR?
Yes. JGS1 has a typical tensile strength of 50 MPa (7.25 ksi) against 30 MPa (4.35 ksi) for ZERODUR — about 67% more.
Which is cheaper, JGS1 or ZERODUR?
ZERODUR is the lower-cost material: it sits in the standard tier ($$) while JGS1 is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, JGS1 or ZERODUR?
ZERODUR. Its machinability rates poor (20/100) against not recommended (12/100) for JGS1.
Ready to make it?
Upload a CAD file and FabDigit prices the part in JGS1 and ZERODUR 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.