Vycor 7913 7930-porous
Grade
also Corning 7913
Use the acid-leached, unconsolidated porous intermediate with nanoscale connected channels for chromatography and catalyst supports, doping matrices and optical or sensor impregnation; limit to 550 °C.
Values for the 7930-porous condition
Other Vycor 7913 tempers and conditions
Vycor 7913 is listed in 3 conditions; see the grade overview at Vycor 7913.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
7930-porousThis page 7930 | Use the acid-leached, unconsolidated porous intermediate with nanoscale connected channels for chromatography and catalyst supports, doping matrices and optical or sensor impregnation; limit to 550 °C. | — | 20 | 0 | 350 HV | 0.6 W/m·K |
7913Default Consolidated 96% SiO₂ high-silica glass | Pick the standard consolidated 96% SiO₂ grade for windows, tubing and furnace parts needing near-quartz expansion and thermal shock resistance, yet formable by conventional glass processes. | — | 50 | — | 620 HV | 1 W/m·K |
99%+ SiO₂ | Choose the extended-leach, fully vitrified variant when service to 1100 °C, lower dielectric loss or better alkali and steam resistance is needed; residual B₂O₃ and alkali are minimal. | — | 55 | — | 700 HV | 1 W/m·K |
What is Vycor 7913 7930-porous?
Vycor 7913 7930-porous is Vycor 7913 in the 7930-porous grade — use the acid-leached, unconsolidated porous intermediate with nanoscale connected channels for chromatography and catalyst supports, doping matrices and optical or sensor impregnation; limit to 550 °C. Vycor 7913 7930-porous has a tensile strength of 20 MPa (2.9 ksi), weaker than 89% of glass grades. Elongation at break is 0% and the elastic modulus is 35 GPa (5.08 Msi). Vycor 7913 7930-porous has a density of 1.5 g/cm³ (0.0542 lb/in³), lighter than 100% of glass grades. It melts at 1,500°C (2,732 °F). 7913 is the default condition FabDigit quotes; 7930-porous is available on request or by drawing note.
Advantages
- Lightweight — 1.5 g/cm³ (0.0542 lb/in³), better than 100% of glass grades
Limitations
- Poor heat conductor — 0.6 W/m·K (0.347 BTU/hr·ft·°F), worse than 97% of glass grades
- Low stiffness — 35 GPa (5.08 Msi), worse than 86% of glass grades
- Low fracture toughness — 0.35 MPa·√m (0.319 ksi·√in), worse than 79% of glass grades
Vycor 7913 7930-porous properties
Typical room-temperature values for Vycor 7913 7930-porous; 16 are specific to this condition. Other listed values are Vycor 7913 reference data and may not represent this condition. Bars are the position among glass grades.
Physical5
Vycor 7913 7930-porous has a density of 1.5 g/cm³ (0.0542 lb/in³), lighter than 100% of glass grades. It melts at 1,500°C (2,732 °F).
Mechanical13
Vycor 7913 7930-porous has a tensile strength of 20 MPa (2.9 ksi), weaker than 89% of glass grades. Elongation at break is 0% and the elastic modulus is 35 GPa (5.08 Msi).
Thermal5
Vycor 7913 7930-porous is rated for continuous service to 550°C (1,022 °F). It conducts heat at 0.6 W/m·K (0.347 BTU/hr·ft·°F), worse than 97% of glass grades. Thermal expansion is 0.8 µm/m·K (0.444 µin/in·°F).
Electrical5
Vycor 7913 7930-porous is an electrical insulator with a dielectric strength of 30 kV/mm (762 V/mil) and a resistivity of 1×10⁹ Ω·m.
Chemical & Environmental2
Corrosion resistance is very good (80/100), better than 58% of glass grades.
Sustainability4
Producing a kilogram of Vycor 7913 7930-porous takes about 60 MJ of energy and emits 4.5 kg of CO₂ — more than 58% of glass grades. Typical recycled content is 0%.
Manufacturability3
Vycor 7913 7930-porous's machinability is poor (30/100, better than 71% of glass grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Vycor 7913 7930-porous
Is Vycor 7913 easy to machine?
Diamond grinding, ultrasonic machining or laser processing only; run wet and leave finish-grind stock to remove the subsurface crack layer.
Can Vycor 7913 be welded?
Glass sealing is done with an oxy-hydrogen or plasma flame. It fuses to fused silica, but joining to borosilicate needs graded transition seals because of the large expansion mismatch.
Can Vycor 7913 be formed, bent or molded?
The borosilicate precursor is formed by normal glass processes, then phase-separated, acid-leached and densified at 1200 °C; the part shrinks about 14%, so tooling must be scaled up by the shrinkage factor.
What surface finishes work on Vycor 7913?
Fire polishing or mechanical and chemical polishing gives optical surfaces; HF etching removes the damaged surface layer but thins the part significantly.
Vycor 7913 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 |
|---|---|---|
| B2O3residual boron not fully leached out | 2 – 3.5 | 2.9 |
| Al2O3 | 0.2 – 0.6 | 0.4 |
| Na2Oresidual alkali, controls high-temperature resistivity | 0 – 0.1 | 0.04 |
| ZrO2 + other oxidestrace | 0 – 0.3 | 0.1 |
| SiO2residual skeleton after leaching | ≥ 95 (balance) | — |
Vycor 7913 7930-porous — frequently asked
What is Vycor 7913 7930-porous used for?
Vycor 7913 7930-porous is typically used for high-temperature lamp envelopes, aerospace windows, laboratory ware and optical filters. In short: near-fused-silica performance; 900 °C service ceiling; cheaper route than fused quartz.
What is the tensile strength of Vycor 7913 7930-porous?
Vycor 7913 7930-porous has a typical tensile strength of 20 MPa (2.9 ksi) — weaker than 89% of glass grades. Strength varies by condition: see the 3 listed tempers.
Is Vycor 7913 7930-porous easy to machine?
Not especially — machinability is rated poor (30/100, better than 71% of glass grades). Diamond grinding, ultrasonic machining or laser processing only; run wet and leave finish-grind stock to remove the subsurface crack layer.
Can Vycor 7913 7930-porous be welded?
Glass sealing is done with an oxy-hydrogen or plasma flame. It fuses to fused silica, but joining to borosilicate needs graded transition seals because of the large expansion mismatch.
What surface finishes work on Vycor 7913 7930-porous?
Fire polishing or mechanical and chemical polishing gives optical surfaces; HF etching removes the damaged surface layer but thins the part significantly.
Can Vycor 7913 7930-porous be formed, bent or molded?
The borosilicate precursor is formed by normal glass processes, then phase-separated, acid-leached and densified at 1200 °C; the part shrinks about 14%, so tooling must be scaled up by the shrinkage factor.
What is the maximum service temperature of Vycor 7913 7930-porous?
Vycor 7913 7930-porous is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Vycor Brand 96% Silica Glass, Code 7913 / 7930 product information — Corning Incorporated (2015)
- IEC 60672-3 Ceramic and glass insulating materials — Part 3: Specifications for individual materials (Types G-795, G-799) — IEC (1997)
- Engineered Materials Handbook Vol. 4: Ceramics and Glasses — ASM International (1991)
- Properties of Glass-Forming Melts / Silica glass property compilations — CRC Press (2005)
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.