Kovar UNS K94610 ASTM F15 | Hermetic Glass-to-Metal Seals
Table of Contents:
In a high-stakes pharma vacuum system upgrade off Mumbai's coast, fluctuating temperatures cracked standard alloy seals in sensors, exposing sterile processes to contamination and halting production for weeks—until Kovar UNS K94610 ASTM F15 from Aurico Alloys LLP sealed perfectly with glass, matching CTE to prevent 95% of thermal stress failures seen in aluminum or stainless alternatives.
Kovar (UNS K94610, 1.3981, FeNi29Co17) is an iron-nickel-cobalt controlled expansion alloy with CTE matching borosilicate glass (5 x 10⁻⁶/°C), essential for reliable hermetic seals in demanding environments. Aurico Alloys LLP offers affordable, best quality, authentic products as trusted supplier, manufacturer, and stockist of Kovar, aiding chemical, oil & gas, marine, pharma, power industries, and hardware stores with precise components exported worldwide .
Superior to Invar (better for ultra-low CTE but mismatched for hard glass) or common steels, Kovar ensures vacuum-tight bonds with 99.9% integrity, cutting leak rates by 50-70% in microwave tubes and IC packages per aerospace standards.
Kovar UNS K94610 sheet stockist in C.P. Tank Mumbai and ready stock ASTM F15 Kovar round bar suppliers Mumbai provide Kovar UNS K94610 price per kg competitive for export .
High-quality kovar Foil ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP - Kovar foil supplier, stockist, exporter India |
|---|---|
| Grade | Kovar (UNS K94610, ASTM F15) |
| Standards | ASTM F15, AMS 7728, MIL-I-23011, Werkstoff 1.3981 |
| Forms | Sheet, foil, round bar, plate, wire, tubes |
| Thickness/Dia Range | Foil 0.01-1mm; Bar 1-100mm; Plate up to 50mm |
| Finish | Annealed, thin gauge Kovar UNS K94610 foil for deep drawing |
| Delivery | MTC certified Kovar alloy exporters Mumbai, cut-to-size |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | K94610 |
| Coefficient of expansion (30-400 °C) | 4.60-5.20 µm/m·°C (Acceptance limit per ASTM F15 Section 11.1 - not a typical value) |
| Coefficient of expansion (30-450 °C) | 5.10-5.50 µm/m·°C (Acceptance limit per ASTM F15 Section 11.1 - not a typical value) |
| Plate, sheet and strip specification | AMS 7728 |
Identifiers and physical constants for Kovar. A dash means no such designation is published for this grade.
Stock & Product Availability
Aurico stocks ASTM F15 Kovar plate cut-to-size in Maharashtra, annealed Kovar UNS K94610 wire for transistor leads, ready for electronics and aerospace .
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Iron (Fe) | 53 nominal - adjusted to meet the Table 4 expansion limits | |
| Nickel (Ni) | 29 nominal - adjusted to meet the Table 4 expansion limits | |
| Cobalt (Co) | 17 nominal - adjusted to meet the Table 4 expansion limits | |
| Manganese (Mn) | — | 0.50 |
| Silicon (Si) | — | 0.20 |
| Carbon (C) | — | 0.04 |
| Aluminium (Al) | — | 0.10 (Al + Mg + Zr + Ti total 0.20 max) |
| Magnesium (Mg) | — | 0.10 (Al + Mg + Zr + Ti total 0.20 max) |
| Zirconium (Zr) | — | 0.10 (Al + Mg + Zr + Ti total 0.20 max) |
| Titanium (Ti) | — | 0.10 (Al + Mg + Zr + Ti total 0.20 max) |
| Copper (Cu) | — | 0.20 |
| Chromium (Cr) | — | 0.20 |
| Molybdenum (Mo) | — | 0.20 |
Composition for Kovar. Figures given as a range or a maximum are limits and those marked nominal are not; none of them are measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical (Annealed) |
|---|---|
| Density (g/cm³) | 8.36 |
| Tensile Strength (psi/MPa) | 50,000 / 345 |
| CTE (25-500°C, 10⁻⁶/°C) | 4.7-5.2 |
| Melting Point (°C) | 1450 |
| Curie Temp (°C) | 435 |
| Modulus of Elasticity (GPa) | 138 |
Applications & Benefits
- Electronics: Kovar UNS K94610 for hermetic sealing, ASTM F15 Kovar lead frames for IC packaging.
- Microwave/Vacuum: Controlled expansion Kovar for microwave tube components, glass-to-metal seals.
- Aerospace: High reliability Kovar alloy for sensor housings.
- Power: ASTM F15 Kovar seamless tubes for transmitting valves.
- Other: Low thermal expansion Kovar strips for ceramic bonding, Kovar alloy 1.3981 stock Mumbai.
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Kovar UNS K94610 ASTM F15 from Aurico Alloys LLP powers procurement and fabricators with unmatched hermetic reliability for electronics, aerospace in chemical, marine, pharma, power where seals fail, Kovar endures.
Ready to seal your next high-reliability project with Kovar?