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AISI 347 Stainless Steel Foil (Light Tight)
Available Configurations
Properties common to all products in this list
Key Features
AISI 347 Stainless Steel Foil (Light Tight) (UNS S34700) is a niobium-stabilized austenitic stainless steel foil engineered for exceptional resistance to sensitization, intergranular corrosion, oxidation, and creep under sustained high-temperature service, while ensuring complete optical opacity through a pinhole-free surface:
Complete Optical Opacity Through a Pinhole-Free Surface
Engineered to a pinhole-free surface, this foil ensures complete optical opacity alongside exceptional resistance to sensitization, intergranular corrosion, oxidation, and creep under sustained high-temperature service.
Reliable Carbide Stability Above 700 °C
Niobium stabilization provides reliable carbide stability above 700 °C, making this foil suitable for light-tight barriers in systems subjected to post-fabrication welding, thermal processing, or extended high-temperature service.
Fine-Grained Microstructure & Precise Thickness Control
Fine-grained microstructure and precise thickness control maintain mechanical integrity and pinhole-free barrier performance through demanding thermal cycling.
Suited to Hermetic Shielding for High-Sensitivity Optical Instruments
Hermetic shielding for high-sensitivity optical instruments in thermally aggressive environments benefits from this foil's combination of exceptional high-temperature stability and complete optical opacity.
Maintains Mechanical Integrity Under Thermal Cycling
This foil maintains mechanical integrity and pinhole-free barrier performance through demanding thermal cycling, supporting use in heat-resistant light-tight gaskets exposed to sustained thermal exposure.
Industrial Applications
AISI 347 Stainless Steel Foil (Light Tight) is used across high-sensitivity optical instrumentation and photochemical reactor sectors requiring exceptional resistance to thermal degradation alongside optical opacity:
- ✦ Hermetic Shielding for High-Sensitivity Optical Instruments in Thermally Aggressive Environments
- Used in hermetic shielding for high-sensitivity optical instruments in thermally aggressive environments, where reliable carbide stability above 700 °C ensures the light-tight barrier survives demanding thermal conditions.
- ✦ Heat-Resistant Light-Tight Gaskets
- Formed into heat-resistant light-tight gaskets, where fine-grained microstructure and precise thickness control maintain mechanical integrity and pinhole-free barrier performance through demanding thermal cycling.
- ✦ Optically Isolated Enclosures for Photochemical Reactor Assemblies
- Used in optically isolated enclosures for photochemical reactor assemblies, where complete optical opacity combined with exceptional resistance to sensitization and oxidation ensures reliable long-term performance.
- ✦ Creep Rupture & Fracture Toughness Research
- Supports investigations of creep rupture behavior, fracture toughness in ultra-thin configurations, and surface treatments that preserve both opacity and corrosion resistance under prolonged elevated-temperature exposure.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 160-190 |
| Elongation at break( % ) | <60 |
| Modulus of elasticity( GPa ) | 190-210 |
| Izod impact strength( J m⁻¹ ) | 20-136 |
| Tensile strength( MPa ) | 520-1100 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 70-73 |
| Element | Value |
|---|---|
| Maximum use temperature in air( C ) | 800 |
| Melting point( C ) | 1400-1425 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 16.3@100°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 16-18@20-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 7.93 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |