Baria-Alkali-Silica Glass (IEC G-600)
ISO IEC 60672-3 G-600
Baria-Alkali-Silica Glass (IEC G-600) is an alkali-silica glass modified with barium oxide to give high electrical resistivity and X-ray absorption without lead; conditions on file are annealed (ANN), tempered (TEMP) and high-baria (HIBA).
Reference datasheet — Baria-Alkali-Silica Glass (IEC G-600) is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the ANN condition
Baria-Alkali-Silica Glass (IEC G-600) tempers and conditions
Baria-Alkali-Silica Glass (IEC G-600) is supplied in 3 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNDefault Annealed | Standard annealed tubing, pressed parts and sealing components — pick when the part must be cut, ground, drilled or glass-to-metal sealed after forming. | 45 | 0 | 540 HV | 1 W/m·K | |
High-baria X-ray absorbing grade | BaO raised toward the top of the class (with SrO) for CRT/X-ray tube envelopes where soft X-ray absorption and high resistivity matter more than density or cost. | 45 | 0 | 550 HV | 0.95 W/m·K | |
Thermally tempered | Air-quenched compressive surface layer for 3–5× bending strength and better mechanical/thermal shock margin — no cutting or grinding possible after tempering. | 150 | 0 | 540 HV | 1 W/m·K |
What is Baria-Alkali-Silica Glass (IEC G-600)?
Baria-Alkali-Silica Glass (IEC G-600) is an alkali-silica glass modified with barium oxide to give high electrical resistivity and X-ray absorption without lead; conditions on file are annealed (ANN), tempered (TEMP) and high-baria (HIBA). It is specified for electron-tube envelopes and lamp glass, where its ~9.5 µm/m·K expansion matches Dumet and 52-alloy lead wires. Tensile strength is about 45 MPa with a 420 °C maximum service temperature, and machinability is the lowest in this group (8), so parts are formed to near-net shape rather than cut. Lead glass G-500 remains the choice when higher X-ray absorption or refractive index is required. Baria-Alkali-Silica Glass (IEC G-600) has a density of 2.82 g/cm³ (0.102 lb/in³), heavier than 53% of glass grades. Baria-Alkali-Silica Glass (IEC G-600) has a tensile strength of 45 MPa (6.53 ksi), weaker than 56% of glass grades. Elongation at break is 0% and the elastic modulus is 72 GPa (10.4 Msi).
What is Baria-Alkali-Silica Glass (IEC G-600) used for?
- electron tube envelopes
- lamp glass
- electrical insulation components
Advantages
- Low embodied carbon — 1.3 kg CO₂/kg, better than 94% of glass grades
Limitations
- Difficult to machine — 8/100, worse than 84% of glass grades
- Poor heat conductor — 1 W/m·K (0.578 BTU/hr·ft·°F), worse than 77% of glass grades
Baria-Alkali-Silica Glass (IEC G-600) properties
Typical room-temperature values for Baria-Alkali-Silica Glass (IEC G-600)-ANN; bars are the position among glass grades.
Physical4
Baria-Alkali-Silica Glass (IEC G-600) has a density of 2.82 g/cm³ (0.102 lb/in³), heavier than 53% of glass grades.
Mechanical13
Baria-Alkali-Silica Glass (IEC G-600) has a tensile strength of 45 MPa (6.53 ksi), weaker than 56% of glass grades. Elongation at break is 0% and the elastic modulus is 72 GPa (10.4 Msi).
Thermal5
Baria-Alkali-Silica Glass (IEC G-600) is rated for continuous service to 420°C (788 °F). It conducts heat at 1 W/m·K (0.578 BTU/hr·ft·°F), worse than 77% of glass grades. Thermal expansion is 9.5 µm/m·K (5.28 µin/in·°F).
Electrical5
Baria-Alkali-Silica Glass (IEC G-600) is an electrical insulator with a dielectric strength of 25 kV/mm (635 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental2
Corrosion resistance is very good (80/100), better than 58% of glass grades.
Sustainability4
Producing a kilogram of Baria-Alkali-Silica Glass (IEC G-600) takes about 16 MJ of energy and emits 1.3 kg of CO₂ — less than 96% of glass grades. Typical recycled content is 15%.
Manufacturability2
Baria-Alkali-Silica Glass (IEC G-600)'s machinability is not recommended (8/100, worse than 84% of glass grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the glass family
Yield strength against density for every glass grade FabDigit runs. Baria-Alkali-Silica Glass (IEC G-600) is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Baria-Alkali-Silica Glass (IEC G-600)
Is Baria-Alkali-Silica Glass (IEC G-600) easy to machine?
No conventional machining — diamond grinding, ultrasonic drilling, waterjet or scribe-and-break on annealed stock only; anneal after heavy grinding to relieve subsurface stress.
Can Baria-Alkali-Silica Glass (IEC G-600) be welded?
Joined by flame or induction glass-to-glass fusion and glass-to-metal seals; the ~9.5 µm/m·K CTE matches Dumet and 52-alloy leads, never fuse directly to borosilicate.
Can Baria-Alkali-Silica Glass (IEC G-600) be formed, bent or molded?
Formed by tube drawing, blowing, pressing or lampworking in the 700–1000 °C working range, followed by a controlled anneal near 480–520 °C.
Baria-Alkali-Silica Glass (IEC G-600) chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| BaOraises resistivity and X-ray absorption | 6 – 20 | 12 |
| Na2O | 3 – 10 | 7 |
| K2Omixed-alkali effect lowers loss | 2 – 10 | 6 |
| Al2O3improves durability | 1 – 5 | 2.5 |
| CaO | 0 – 4 | 1.5 |
| MgO | 0 – 3 | 1 |
| SrOused with BaO in X-ray absorbing melts | 0 – 8 | 2 |
| ZrO2 + TiO2durability / solarization control | 0 – 3 | 0.5 |
| SiO2network former | ≥ 55 (balance) |
What surface finishes work on Baria-Alkali-Silica Glass (IEC G-600)?
Fire-polish or cerium-oxide polish for optical clarity; acid (HF) etching for frosting, and conductive or getter coatings applied by sputtering/CVD.
Equivalent designations
Standards and trade names that resolve to Baria-Alkali-Silica Glass (IEC G-600) in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ISO
- IEC 60672-3 G-600
How much does Baria-Alkali-Silica Glass (IEC G-600) cost?
Baria-Alkali-Silica Glass (IEC G-600) is a premium-cost glass ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Baria-Alkali-Silica Glass (IEC G-600) — frequently asked
What is Baria-Alkali-Silica Glass (IEC G-600) used for?
Baria-Alkali-Silica Glass (IEC G-600) is typically used for electron tube envelopes, lamp glass and electrical insulation components. In short: lead-free X-ray absorber; dumet-matched expansion; high electrical resistivity.
What is the tensile strength of Baria-Alkali-Silica Glass (IEC G-600)?
Baria-Alkali-Silica Glass (IEC G-600) has a typical tensile strength of 45 MPa (6.53 ksi) — weaker than 56% of glass grades. Strength varies by condition: see the 3 listed tempers.
Is Baria-Alkali-Silica Glass (IEC G-600) easy to machine?
Not especially — machinability is rated not recommended (8/100, worse than 84% of glass grades). No conventional machining — diamond grinding, ultrasonic drilling, waterjet or scribe-and-break on annealed stock only; anneal after heavy grinding to relieve subsurface stress.
Can Baria-Alkali-Silica Glass (IEC G-600) be welded?
Joined by flame or induction glass-to-glass fusion and glass-to-metal seals; the ~9.5 µm/m·K CTE matches Dumet and 52-alloy leads, never fuse directly to borosilicate.
What surface finishes work on Baria-Alkali-Silica Glass (IEC G-600)?
Fire-polish or cerium-oxide polish for optical clarity; acid (HF) etching for frosting, and conductive or getter coatings applied by sputtering/CVD.
Can Baria-Alkali-Silica Glass (IEC G-600) be formed, bent or molded?
Formed by tube drawing, blowing, pressing or lampworking in the 700–1000 °C working range, followed by a controlled anneal near 480–520 °C.
What is the maximum service temperature of Baria-Alkali-Silica Glass (IEC G-600)?
Baria-Alkali-Silica Glass (IEC G-600) is rated for continuous use to about 420°C (788 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Baria-Alkali-Silica Glass (IEC G-600) cost?
Baria-Alkali-Silica Glass (IEC G-600) is a premium-cost glass ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- IEC 60672-1/-3 Ceramic and glass insulating materials — classification and specifications — IEC (1995)
- Engineered Materials Handbook Vol.4: Ceramics and Glasses — ASM International (1991)
- Properties of Glass-Forming Melts / Handbook of Glass Data — Elsevier / CRC (2005)
- Technical and lamp glass tubing property sheets — Schott / Corning (2020)
- ISO 719 / ISO 720 hydrolytic resistance of glass — ISO (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.