Alumina-Lime-Silica Glass (IEC G-400) ANN (Annealed)
Heat-treated state · default condition
ISO IEC 60672-3 G-400
Standard supply state for tubing, bulbs, sealing parts and windows where the glass will be further worked or sealed.
Values for the ANN condition
Other Alumina-Lime-Silica Glass (IEC G-400) tempers and conditions
Alumina-Lime-Silica Glass (IEC G-400) is listed in 3 conditions; see the grade overview at Alumina-Lime-Silica Glass (IEC G-400).
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNDefaultThis page Annealed | Standard supply state for tubing, bulbs, sealing parts and windows where the glass will be further worked or sealed. | — | 60 | 0 | 620 HV | 1 W/m·K |
Thermally tempered | Choose when mechanical or thermal-shock loading is high and no post-forming cutting or flame sealing is required. | — | 150 | 0 | 620 HV | 1 W/m·K |
Chemically strengthened | Choose for thin (<3 mm) cover glass, windows and lamp parts needing very high scratch and bending strength; strengthening relaxes above ~350 °C. | — | 300 | 0 | 660 HV | 1 W/m·K |
What is Alumina-Lime-Silica Glass (IEC G-400) ANN?
Alumina-Lime-Silica Glass (IEC G-400) ANN is Alumina-Lime-Silica Glass (IEC G-400) heat treated to ANN — standard supply state for tubing, bulbs, sealing parts and windows where the glass will be further worked or sealed. Alumina-Lime-Silica Glass (IEC G-400) ANN has a tensile strength of 60 MPa (8.7 ksi), stronger than 74% of glass grades. Elongation at break is 0% and the elastic modulus is 87 GPa (12.6 Msi). Alumina-Lime-Silica Glass (IEC G-400) ANN has a density of 2.6 g/cm³ (0.0939 lb/in³), lighter than 57% of glass grades.
Advantages
- Low embodied carbon — 1.6 kg CO₂/kg, better than 90% of glass grades
Alumina-Lime-Silica Glass (IEC G-400) ANN properties
Typical room-temperature values for Alumina-Lime-Silica Glass (IEC G-400) ANN; 13 are specific to this condition. Other listed values are Alumina-Lime-Silica Glass (IEC G-400) reference data and may not represent this condition. Bars are the position among glass grades.
Physical4
Alumina-Lime-Silica Glass (IEC G-400) ANN has a density of 2.6 g/cm³ (0.0939 lb/in³), lighter than 57% of glass grades.
Mechanical13
Alumina-Lime-Silica Glass (IEC G-400) ANN has a tensile strength of 60 MPa (8.7 ksi), stronger than 74% of glass grades. Elongation at break is 0% and the elastic modulus is 87 GPa (12.6 Msi).
Thermal5
Alumina-Lime-Silica Glass (IEC G-400) ANN is rated for continuous service to 650°C (1,202 °F). It conducts heat at 1.2 W/m·K (0.693 BTU/hr·ft·°F), worse than 58% of glass grades. Thermal expansion is 4.6 µm/m·K (2.56 µin/in·°F).
Electrical5
Alumina-Lime-Silica Glass (IEC G-400) ANN is an electrical insulator with a dielectric strength of 30 kV/mm (762 V/mil) and a resistivity of 1×10¹³ Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (90/100), better than 73% of glass grades.
Sustainability4
Producing a kilogram of Alumina-Lime-Silica Glass (IEC G-400) ANN takes about 25 MJ of energy and emits 1.6 kg of CO₂ — less than 88% of glass grades. Typical recycled content is 5%.
Manufacturability2
Alumina-Lime-Silica Glass (IEC G-400) ANN's machinability is not recommended (12/100, worse than 68% of glass grades).
Common Calculations4
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Alumina-Lime-Silica Glass (IEC G-400) ANN
Is Alumina-Lime-Silica Glass (IEC G-400) easy to machine?
Cold work only by diamond grinding, ultrasonic drilling, water-jet or laser; anneal after heavy grinding and never machine tempered or ion-exchanged parts.
Can Alumina-Lime-Silica Glass (IEC G-400) be welded?
Joined by flame/lathe glass working near 1000–1100 °C or by glass-to-metal sealing with matched alloys; adjacent glasses must match the ~4.6 µm/m·K CTE.
Can Alumina-Lime-Silica Glass (IEC G-400) be formed, bent or molded?
Melted around 1550–1650 °C and drawn, blown or pressed at working point (~1150–1200 °C); higher furnace temperatures than soda-lime require Mo/Pt-lined melters.
What surface finishes work on Alumina-Lime-Silica Glass (IEC G-400)?
Fire-polishing, acid polishing, optical lapping, ion exchange in KNO₃ (~420 °C) or thin-film/ITO coating are all standard.
Alumina-Lime-Silica Glass (IEC G-400) 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 |
|---|---|---|
| Al2O3defines the G-400 group; raises softening point and resistivity | 14 – 25 | 18 |
| CaO | 5 – 13 | 9 |
| MgO | 3 – 10 | 7 |
| B2O3optional melting aid | 0 – 6 | 4 |
| BaOvariant dependent | 0 – 8 | 4 |
| Na2O+K2Okept low for high electrical resistivity (higher, 12–16 %, in ion-exchangeable cover-glass variants) | 0 – 2 | 0.6 |
| SiO2network former | ≥ 52 (balance) | — |
Alumina-Lime-Silica Glass (IEC G-400) ANN — frequently asked
What is Alumina-Lime-Silica Glass (IEC G-400) ANN used for?
Alumina-Lime-Silica Glass (IEC G-400) ANN is typically used for incandescent/fluorescent lamp seals, electrical insulator bodies and fiberglass reinforcement precursor. In short: highest-temperature lime-silica glass; low 4.6 µm/m·K expansion; strongest annealed glass here.
What is the tensile strength of Alumina-Lime-Silica Glass (IEC G-400) ANN?
Alumina-Lime-Silica Glass (IEC G-400) ANN has a typical tensile strength of 60 MPa (8.7 ksi) — stronger than 74% of glass grades. Strength varies by condition: see the 3 listed tempers.
Is Alumina-Lime-Silica Glass (IEC G-400) ANN easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 68% of glass grades). Cold work only by diamond grinding, ultrasonic drilling, water-jet or laser; anneal after heavy grinding and never machine tempered or ion-exchanged parts.
Can Alumina-Lime-Silica Glass (IEC G-400) ANN be welded?
Joined by flame/lathe glass working near 1000–1100 °C or by glass-to-metal sealing with matched alloys; adjacent glasses must match the ~4.6 µm/m·K CTE.
What surface finishes work on Alumina-Lime-Silica Glass (IEC G-400) ANN?
Fire-polishing, acid polishing, optical lapping, ion exchange in KNO₃ (~420 °C) or thin-film/ITO coating are all standard.
Can Alumina-Lime-Silica Glass (IEC G-400) ANN be formed, bent or molded?
Melted around 1550–1650 °C and drawn, blown or pressed at working point (~1150–1200 °C); higher furnace temperatures than soda-lime require Mo/Pt-lined melters.
What is the maximum service temperature of Alumina-Lime-Silica Glass (IEC G-400) ANN?
Alumina-Lime-Silica Glass (IEC G-400) ANN is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- IEC 60672-3 Ceramic and glass insulating materials – Part 3: Specifications for individual materials (group G) — IEC (1997)
- Corning Code 1723 aluminosilicate glass properties — Corning Incorporated (2018)
- Engineered Materials Handbook Vol. 4: Ceramics and Glasses — ASM International (1991)
- Technical glass properties (aluminosilicate / lamp glass) — SCHOTT AG (2022)
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.