Invar 36,Nilo 36 Foil,Shim,UNS K93601,E FORU

British Specs:，American Specs: ASTM F1684 MIL-S-16598 Tooling plate ASTM B388 Sheet & strip ASTM B753 K93050 Free-cut Invar，German Specs:WS 1.3912

**Invar 36 / Nilo 36 Foil & Shim (UNS K93601) - Technical Product Introduction** --- ### **Overview** Invar 36, commercially known as **Nilo 36 Foil & Shim** (UNS K93601), represents the ultra-thin product forms of the classic 36% nickel-iron low expansion alloy. These precision-engineered materials maintain the characteristic dimensional stability of the Invar family while offering exceptional formability and precise thickness control, making them ideal for applications where minimal thermal expansion and precise gap-filling capabilities are critical. --- ### **1. Chemical Composition (%)** | Element | Content | |---------|---------| | **Nickel (Ni)** | 35.0-37.0 | | **Iron (Fe)** | Balance | | **Carbon (C)** | ≤0.10 | | **Manganese (Mn)** | ≤0.50 | | **Silicon (Si)** | ≤0.30 | | **Phosphorus (P)** | ≤0.025 | | **Sulfur (S)** | ≤0.025 | | **Cobalt (Co)** | ≤0.50 | | **Chromium (Cr)** | ≤0.25 | --- ### **2. Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.13 g/cm³ | | **Melting Point** | 1425°C | | **Coefficient of Thermal Expansion** | **1.6 × 10⁻⁶/°C** (20-100°C) | | **Thermal Conductivity** | 10.5 W/m·K | | **Specific Heat Capacity** | 515 J/kg·K | | **Modulus of Elasticity** | 145 GPa | | **Electrical Resistivity** | 0.75 μΩ·m | --- ### **3. Mechanical Properties** | Property | Foil (Annealed) | Shim (Hard) | |----------|-----------------|-------------| | **Tensile Strength** | 450-520 MPa | 550-650 MPa | | **Yield Strength (0.2%)** | 250-310 MPa | 500-600 MPa | | **Elongation** | 30-40% | 8-15% | | **Hardness** | 70-80 HRB | 85-95 HRB | --- ### **4. Product Specifications** **Foil Products:** - **Thickness Range:** 0.01 mm to 0.15 mm - **Width Range:** 50 mm to 300 mm - **Standard Tolerance:** ±0.005 mm - **Surface Finish:** Bright annealed or matte **Shim Products:** - **Thickness Range:** 0.05 mm to 1.0 mm - **Width Range:** 10 mm to 600 mm - **Standard Tolerance:** ±0.01 mm - **Available Forms:** Sheets, custom shapes, precision blanks --- ### **5. Product Applications** **Electronics & Semiconductor:** - **Micro-electronic Lead Frames:** For ultra-miniaturized components - **EMI/RFI Shielding:** Precision gaskets and shields - **Circuit Board Spacers:** Thermal management components - **Sensor Diaphragms:** Pressure and temperature sensors **Aerospace & Defense:** - **Aircraft Instrumentation:** Precision shims and spacers - **Satellite Components:** Thin thermal management layers - **Optical Systems:** Mounting and alignment shims - **Cryogenic Seals:** Low-temperature gasket materials **Precision Engineering:** - **Bimetal Thermostats:** Low-expansion element - **Measuring Instruments:** Precision scale substrates - **Laser System Components:** Optical mounting foils - **Medical Devices:** Surgical instrument components **Industrial Applications:** - **Mold & Die Spacers:** Thermal compensation elements - **Vacuum System Gaskets:** Sealing applications - **Thermal Management:** Heat spreader applications - **Precision Alignment:** Machinery setup and calibration --- ### **6. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684 | Standard Specification for Foil and Strip | | **AMS** | AMS 7725 | Aerospace Material Specification | | **DIN** | DIN 1.3912 | German Standard | | **EN** | EN 1.3912 | European Standard | | **JIS** | JIS NCF 2 | Japanese Industrial Standard | | **GB** | GB 4J36 | Chinese National Standard | --- ### **7. Fabrication Characteristics** **Forming & Stamping:** - **Minimum Bend Radius:** 1t (material thickness) - **Punch Clearance:** 5-8% of material thickness - **Springback Factor:** Moderate, predictable - **Tool Life:** Excellent with proper maintenance **Joining Methods:** - **Welding:** GTAW (TIG) with matching filler - **Brazing:** Compatible with silver-based alloys - **Adhesive Bonding:** Excellent surface compatibility - **Mechanical Fastening:** Suitable for riveting and clinching **Surface Treatments:** - **Plating:** Excellent for gold, nickel, tin plating - **Passivation:** Improved corrosion resistance - **Coating:** Various organic and inorganic coatings - **Etching:** Precision chemical etching capabilities --- ### **8. Quality Assurance** **Testing & Inspection:** - **Dimensional Verification:** 100% thickness monitoring - **Surface Quality:** Microscopic inspection - **Flatness Testing:** Laser-based measurement - **Tensile Testing:** Regular mechanical property verification **Certification & Documentation:** - **Material Certification:** 3.1 Mill Certificate - **Traceability:** Full heat and lot traceability - **RoHS Compliance:** Meets environmental requirements - **REACH Compliance:** Chemical safety compliance **Special Requirements:** - **Clean Room Packaging:** For semiconductor applications - **Vapor Barrier Protection:** Moisture-sensitive packaging - **Static Shielding:** For electronic applications - **Custom Slitting:** Precision width tolerances --- ### **9. Design Considerations** **Thermal Performance:** - Maintains dimensional stability from cryogenic to 300°C - Minimal thermal stress in composite structures - Compatible with various thermal cycling environments **Mechanical Considerations:** - Excellent fatigue resistance in thin sections - Good creep resistance at elevated temperatures - Maintains mechanical properties at cryogenic temperatures **Application Guidelines:** - Proper storage to prevent deformation - Careful handling to avoid surface damage - Appropriate cleaning before assembly - Consideration of work hardening during forming --- ### **Conclusion** Nilo 36 Foil and Shim (UNS K93601) provide an exceptional combination of ultra-low thermal expansion, precision manufacturing capabilities, and reliable performance in demanding thermal environments. Their availability in ultra-thin gauges with precise dimensional control makes them particularly valuable for electronic components, precision instruments, and aerospace applications where thermal management and dimensional stability are critical. The material's consistent performance, coupled with its fabrication versatility, ensures reliable operation in the most demanding precision applications. Proper selection of thickness, temper, and surface condition is essential for achieving optimal results in specific applications.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2415 gallon liquid totes Special package is available on request.