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Grade: 7075
Formula: Al 90/Zn 5.5/Mg 2.5/Cu 1.5/Si 0.5
Form: Foil (Light Tight)
Material: Aluminum
Commodity: Alloys
Light Tight:
Light Tight
7075 Aluminum Foil (Light Tight) is a high-strength aluminum-zinc-magnesium-copper alloy foil designed for exceptional tensile performance, fatigue resistance, and complete light impermeability through a flawless, pinhole-free surface. This unique combination provides both mechanical robustness and total optical shielding, making it indispensable for enclosing and protecting sensitive components in demanding environments. Aerospace, defense, and precision instrumentation sectors employ it for hermetic light-proof laminates, high-strength reflective barriers, and optically sealed housings. Specific applications include optical component encapsulation in avionics, light-blocking thermal control layers in satellite systems, and secure protective wraps for defense-grade sensors. In research and innovation, 7075 light-tight foil supports the development of hybrid structural-barrier materials, controlled-environment enclosures for photochemical experiments, and ultra-reliable thermal-optical protection systems. Its balance of strength, corrosion resistance, and absolute light exclusion ensures critical value in advanced scientific and high-performance industrial domains.
Material Properties for Alloys
Mechanical Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 150 |
| Elongation at break( % ) | 5-8% |
| Shear strength( MPa ) | 331 |
| Tensile strength( MPa ) | 510-538 |
Electrical Properties
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 5.15 |
| Temperature coefficient( K⁻¹ ) | - |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 447-635 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 130@20°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 24.4@20-250°C |
Physical Properties
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 2.8 |
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