Invar UNS K93600 ASTM F1684 Foil | Ultra-Low Thermal Expansion
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During a critical satellite launch preparation in Mumbai, engineers faced dimensional shifts in microwave filter components due to minor temperature fluctuations, risking mission failure for procurement heads in aerospace and defense. The fix was Invar UNS K93600 ASTM F1684 foil from Aurico Alloys LLP its near-zero CTE (1.3 x 10⁻⁶/°C) ensured stability where aluminum or Kovar foils warped by 5-10x more, saving weeks of rework and boosting precision by orders of magnitude .
Invar 36 (UNS K93600, 1.3912, FeNi36) is a nickel-iron alloy with 36% Ni, engineered for minimal thermal expansion from -100°C to +200°C, far surpassing stainless steels or copper in stability for precision applications . Aurico Alloys LLP provides affordable, best quality, authentic Invar UNS K93600 ASTM F1684 as trusted supplier, manufacturer, and stockist, helping chemical, oil & gas, marine, pharma, power industries, plus hardware stores with verified stock for export from India to abroad .
Unlike Kovar (which expands more at low temps) or standard alloys, Invar foil maintains tolerances under 1 ppm/°C, ideal for MRI shielding or LNG tank liners reducing failure rates by 40-60% in cyclic thermal service per industry benchmarks .
As Invar UNS K93600 foil supplier in Mumbai for satellite microwave filters and ASTM F1684 Invar 36 foil stockist for aerospace composite mold layouts in India, Aurico offers competitive Invar foil price per kg for defense-grade needs .
High-quality Invar Foil ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP - Invar foil supplier, stockist, exporter India |
|---|---|
| Grade | Invar 36 |
| Standards | One plate, sheet and strip specification, in the identity table below. Foil is strip: VDM lists ASTM B603 and DIN 17470 for that form rather than the sheet and plate standards. Inspection certificates to EN 10204. |
| Thickness Range | 0.02mm – 0.5mm (thin gauge Invar 36 foil for electronic masks) |
| Width/Length | 5-420mm width, coils/sheets cut-to-size |
| Finish | Annealed, bright, polished foil/shims/strips |
| Delivery | MTC EN 10204 3.1, verified Invar 36 stockholders India |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | K93600 / K93601 / K93602 / K93603 |
| Werkstoff / EN number | 1.3912 |
| EN designation | Ni36 |
| Density | 8.1 g/cm3 |
| Melting range | 1430 °C |
| Specific heat capacity (20 °C) | 486 J/kg·K |
| Thermal conductivity (20 °C) | 12.8 W/m·K |
| Electrical resistivity (20 °C) | 78 µΩ·cm |
| Modulus of elasticity (20 °C) | 143 GPa |
| Curie temperature | 230 °C |
| Plate, sheet and strip specification | ASTM F1684 / B753 / B603 |
Identifiers and physical constants for Invar 36. A dash means no such designation is published for this grade.
Stock & Product Availability
Aurico stocks low expansion Invar foil for aerospace sensors, UNS K93600 Invar foil exporters in Mumbai serving aircraft engine manufacturers, with custom cut-to-size for semiconductor tools .
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 35 | 37 |
| Chromium (Cr) | — | 0.25 |
| Iron (Fe) | — | Balance |
| Cobalt (Co) | — | 0.5 |
| Manganese (Mn) | — | 0.6 |
| Silicon (Si) | — | 0.4 |
| Carbon (C) | — | 0.05 |
| Sulfur (S) | — | 0.015 |
| Phosphorus (P) | — | 0.015 |
Composition limits for Invar 36. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (MPa) | 445-810 |
| Yield Strength (MPa) | 240-725 |
| Elongation (%) | 6-45 |
| CTE (20-100°C, 10⁻⁶/K) | <1.3 |
| Max Service Temp (°C) | Up to 230 |
Applications & Benefits
- Aerospace: ASTM F1684 Invar 36 foil for aerospace composite mold layouts, low expansion Invar foil for sensors/structural parts .
- Precision Instruments: Dimensional stable Invar UNS K93600 foil for laboratory measuring equipment, Invar foil stockist Mumbai for pendulum clocks/geodetic tapes .
- Electronics: Thin gauge Invar 36 foil for display masks, Invar foil for lead frames/glass-to-metal sealing, Invar 36 vs Kovar foil for sealing .
- Medical: Magnetic shielding Invar 36 foil supplier Mumbai for MRI components .
- Power/Cryo: ASTM F1684 Invar alloy foil for cryogenic LNG tank liners.
- Defense: Invar foil price per kg Mumbai for laser housing .
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
Invar UNS K93600 ASTM F1684 foil from Aurico Alloys LLP delivers unmatched dimensional stability for engineers and OEMs in chemical, oil & gas, marine, pharma, power outperforming alternatives in precision where microns matter .
Is your next precision project secured with low-expansion Invar foil?