- Materials
- Forms
- Reference Materials
-
Services
-
Services
-
-
Sectors
-
Supporting cutting edge research and development with advanced materials to your needs.
High performance materials for extreme conditions.
Innovative and lightweight materials with high mechanical properties and durability.
Materials used in chemical engineering from consumables to innovative solutions.
Advanced materials characterized by high electrical or insulation performance.
High quality materials for renewable energy.
Biocompatible and biodegradable materials to the highest standards.
High purity, biocompatible materials for high performance devices and applications.
High purity metals and alloys in various forms and crucibles suitable to your needs.
State of the art materials for the next generation of technologies.
High performance materials for extreme conditions.
Durable materials for corrosive environments.
Foils, disks or windows across a range of materials to facilitate your innovation.
Polymers, metal foils, and sustainable materials for your packaging needs.
Your requirements for unique products and attributes will be met across our 170,000+ product range and customization capabilities.
High-quality materials across branded products in various forms including rods, wires, and foils support space technology needs.
Highest quality materials to support your need for small-quantity specialist materials such as graphite and lithium compounds.
High purity materials to improve the reproducibility and reliability of your evaporation processes.
-
- Product Ranges
-
Resources
-
Find out our latest news.
Read our latest insights, and opinions.
Discover our Innovation Discovered podcasts on innovation, products, interesting topics, and more.
Find out how we've worked with our partners
Our latest updates on what we are doing, find out more.
Find out more about us and the great roles we have available for talented individuals. Find out more.
Take a look at our global distributors.
Explore our FAQ resource to help answer your key questions.
Gain a clearer picture of the language used in scientific study
-
- About Us
Duplex Stainless Steel Foil (Light Tight)
Available Configurations
Properties common to all products in this list
Key Features
Duplex Stainless Steel Foil (Light Tight) (UNS S31803 / S32205) combines the high mechanical strength, superior chloride corrosion resistance, and phase-balanced microstructure of duplex stainless steel with complete light impermeability through a pinhole-free surface:
Complete Light Impermeability
Manufactured to a pinhole-free surface, this foil provides complete light impermeability while retaining the high mechanical strength and corrosion resistance of the duplex alloy system.
Substantially Superior Resistance to Chloride-Induced Pitting, Crevice Corrosion & Stress Corrosion Cracking
The dual-phase austenitic-ferritic structure provides resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking substantially superior to standard austenitic grades.
Suited to Marine, Offshore & Chemical Processing Light-Tight Barriers
This foil is suitable for light-tight barriers in marine, offshore, and chemical processing environments where conventional austenitic light-tight foils would be vulnerable to chloride attack.
Phase-Balanced Microstructure for High Mechanical Strength
The phase-balanced microstructure delivers high mechanical strength alongside complete light impermeability, a combination unavailable in standard austenitic light-tight foils.
Combines Optical Barrier Performance with Marine-Grade Corrosion Resistance
This foil combines reliable optical barrier performance with marine-grade corrosion resistance, suited to subsea and chemical plant applications where conventional foils would degrade.
Industrial Applications
Duplex Stainless Steel Foil (Light Tight) is used across marine, offshore, and subsea sectors where conventional austenitic light-tight foils would be vulnerable to chloride-induced corrosion:
- ✦ Optical Shielding in Photonic Devices Deployed in Aggressive Environments
- Used as optical shielding in photonic devices deployed in aggressive environments, where substantially superior resistance to chloride-induced pitting and crevice corrosion ensures reliable long-term optical isolation.
- ✦ Light-Blocking Layers in Precision Instrumentation for Marine or Offshore Service
- Formed into light-blocking layers in precision instrumentation for marine or offshore service, where the dual-phase microstructure's corrosion resistance substantially exceeds that of standard austenitic light-tight foils.
- ✦ Corrosion-Resistant Optical Barriers in Sensor Housings for Subsea or Chemical Plant Applications
- Used in corrosion-resistant optical barriers in sensor housings for subsea or chemical plant applications, where complete light impermeability combined with marine-grade corrosion resistance ensures reliable, durable performance.
- ✦ Microstructural Phase Balance & Light-Blocking Integrity Research
- Serves as a model material for studying the interplay between microstructural phase balance, light-blocking integrity, and mechanical performance under chemically demanding conditions.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 290 |
| Elongation at break( % ) | <25 |
| Modulus of elasticity( GPa ) | 200 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 80 |
| Temperature coefficient( K⁻¹ ) | - |
| Element | Value |
|---|---|
| Melting point( C ) | 1440 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 500@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 19@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 13.7@20-100°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% |