Baria-Alkali-Silica Glass (IEC G-600) HIBA
Grade
ISO IEC 60672-3 G-600
HIBA = 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.
Values for the HIBA condition
Other Baria-Alkali-Silica Glass (IEC G-600) tempers and conditions
Baria-Alkali-Silica Glass (IEC G-600) is listed in 3 conditions; see the grade overview at Baria-Alkali-Silica Glass (IEC G-600).
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 |
HIBAThis page 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) HIBA?
Baria-Alkali-Silica Glass (IEC G-600) HIBA is Baria-Alkali-Silica Glass (IEC G-600) in the HIBA 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. Baria-Alkali-Silica Glass (IEC G-600) HIBA 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 74 GPa (10.7 Msi). Baria-Alkali-Silica Glass (IEC G-600) HIBA has a density of 2.98 g/cm³ (0.108 lb/in³), heavier than 54% of glass grades. ANN is the default condition FabDigit quotes; HIBA is available on request or by drawing note.
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 — 0.95 W/m·K (0.549 BTU/hr·ft·°F), worse than 80% of glass grades
Baria-Alkali-Silica Glass (IEC G-600) HIBA properties
Typical room-temperature values for Baria-Alkali-Silica Glass (IEC G-600) HIBA; 18 are specific to this condition. Other listed values are Baria-Alkali-Silica Glass (IEC G-600) reference data and may not represent this condition. Bars are the position among glass grades.
Physical4
Baria-Alkali-Silica Glass (IEC G-600) HIBA has a density of 2.98 g/cm³ (0.108 lb/in³), heavier than 54% of glass grades.
Mechanical13
Baria-Alkali-Silica Glass (IEC G-600) HIBA 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 74 GPa (10.7 Msi).
Thermal5
Baria-Alkali-Silica Glass (IEC G-600) HIBA is rated for continuous service to 400°C (752 °F). It conducts heat at 0.95 W/m·K (0.549 BTU/hr·ft·°F), worse than 80% of glass grades. Thermal expansion is 9.8 µm/m·K (5.44 µin/in·°F).
Electrical5
Baria-Alkali-Silica Glass (IEC G-600) HIBA is an electrical insulator with a dielectric strength of 25 kV/mm (635 V/mil) and a resistivity of 3×10¹² Ω·m.
Chemical & Environmental2
Corrosion resistance is very good (82/100), better than 63% of glass grades.
Sustainability4
Producing a kilogram of Baria-Alkali-Silica Glass (IEC G-600) HIBA 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) HIBA's machinability is not recommended (8/100, worse than 84% of glass grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Baria-Alkali-Silica Glass (IEC G-600) HIBA
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.
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.
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) | — |
Baria-Alkali-Silica Glass (IEC G-600) HIBA — frequently asked
What is Baria-Alkali-Silica Glass (IEC G-600) HIBA used for?
Baria-Alkali-Silica Glass (IEC G-600) HIBA 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) HIBA?
Baria-Alkali-Silica Glass (IEC G-600) HIBA 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) HIBA 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) HIBA 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) HIBA?
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) HIBA 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) HIBA?
Baria-Alkali-Silica Glass (IEC G-600) HIBA is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.