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AISI 420 Stainless Steel Foil (Light Tight)
Available Configurations
Properties common to all products in this list
Key Features
AISI 420 Stainless Steel Foil (Light Tight) (UNS S42000) is a martensitic stainless steel foil with 12-14% chromium and 0.15-0.40 wt% carbon, manufactured to a pinhole-free surface that blocks all external light transmission while delivering high hardness, excellent wear resistance, and moderate corrosion protection:
Blocks All External Light Transmission
Manufactured to a pinhole-free surface, this foil blocks all external light transmission, providing a reliable optical barrier alongside high hardness and wear resistance.
Combines Dimensional Stability with Mechanical Robustness
In thin, precision-rolled form, this foil combines dimensional stability with the mechanical robustness available through quench-and-temper heat treatment, suiting structural and optical isolation applications simultaneously.
Excellent Wear Resistance & Moderate Corrosion Protection
Excellent wear resistance and moderate corrosion protection support reliable performance of this foil in light-sensitive manufacturing and scientific environments where mechanical durability is also required.
Suited to Applications Where Structural Integrity & Optical Isolation Must Coexist
This foil is suitable for applications in aerospace, precision optics, and medical devices where structural integrity and optical isolation must coexist in a single barrier material.
Precision-Rolled Form for Demanding Light-Sensitive Environments
Precision-rolled form supports use in light-sensitive manufacturing and scientific environments where both optical opacity and mechanical wear resistance are simultaneously required.
Industrial Applications
AISI 420 Stainless Steel Foil (Light Tight) is used across aerospace, precision optics, and medical device sectors where structural integrity and optical isolation must coexist:
- ✦ Precision Light-Blocking Shims in Measurement Instrumentation
- Used as precision light-blocking shims in measurement instrumentation, where the pinhole-free surface blocks all external light transmission and high hardness ensures dimensional stability under mechanical load.
- ✦ Optical Enclosure Linings
- Formed into optical enclosure linings, where the combination of dimensional stability and mechanical robustness from quench-and-temper heat treatment supports reliable long-term performance.
- ✦ Wear-Resistant Sealing Strips in Light-Sensitive Manufacturing & Scientific Environments
- Used as wear-resistant sealing strips in light-sensitive manufacturing and scientific environments, where excellent wear resistance combined with complete light exclusion ensures durable, reliable sealing performance.
- ✦ Fatigue Strength & Surface Treatment Research
- Explores heat treatment effects on fatigue strength and advanced surface treatment routes for maintaining optical opacity under mechanical and thermal loading.
Material Properties
| Element | Value |
|---|---|
| Elongation at break( % ) | >12 |
| Modulus of elasticity( GPa ) | 200 |
| Tensile strength( MPa ) | 860 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 55 |
| Temperature coefficient( K⁻¹ ) | - |
| Element | Value |
|---|---|
| Melting point( C ) | 1450 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 460@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 24.9@100°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 10.3@0-100°C |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 7.8 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |