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Hastelloy® C-276 Foil (Light Tight)
Available Configurations
Properties common to all products in this list
| Thickness | Size | Temper ⓘ |
|---|---|---|
| 0.025 mm to 1.2 mm | 5 x 5 mm to 200 x 200 mm | As rolled Annealed Hard |
Need custom configurations? Please contact us.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Key Features
Hastelloy® C276 Foil (Light Tight) (Ni 57/Mo 16/Cr 16/Fe 5/W 4, UNS N10276) is a pinhole-free certified nickel-molybdenum-chromium alloy foil combining Hastelloy® C276’s outstanding corrosion resistance in aggressive chemical and marine environments with guaranteed through-thickness barrier integrity:
Pinhole-Free Certification in the Most Chemically Demanding Service Environment
Each batch is tested and certified clear of through-thickness defects. In chemical processing and offshore applications where the foil functions as both a corrosion-resistant barrier and a complete optical or fluid isolation layer, pinhole-free certification is operationally critical: a single through-thickness defect provides a direct pathway for aggressive media through the barrier, bypassing the alloy’s passive film entirely.
Broadest Corrosion Resistance of Any Standard Ni-Mo-Cr Alloy
The combination of 16% molybdenum, tungsten, and chromium suppresses pitting, crevice corrosion, and stress corrosion cracking across the widest range of aggressive environments. Combined with pinhole-free certification, this provides a certified barrier foil capable of long-term service in the most chemically demanding environments where other light tight foil options would corrode and develop barrier defects.
Resistance to Both Hydrochloric and Sulfuric Acids
Resistance to hydrochloric and sulfuric acid solutions, combined with pinhole-free barrier continuity, makes C276 light tight foil the appropriate choice for barrier applications in mixed acid process environments where the chemical nature of the aggressive medium cannot be restricted to a single acid type.
Pitting Resistance in Chloride Solutions
Outstanding pitting resistance in chloride solutions qualifies C276 light tight foil for offshore and marine service environments where chloride-induced pitting of a barrier foil would compromise both corrosion protection and barrier continuity simultaneously.
Good Tensile Strength for Barrier Applications
Tensile strength of 690–1,000 MPa supports use as a barrier element in assemblies where the foil is subject to mechanical loading alongside chemical exposure, without risk of barrier failure from mechanical stress in aggressive service conditions.
Industrial Applications
Hastelloy® C276 Foil (Light Tight) is used wherever the broadest available corrosion resistance and pinhole-free barrier integrity must coexist in the most chemically demanding service environments:
- ✦ Hermetic Barrier Elements in Corrosive Chemical Process Assemblies
- Used for hermetic barrier elements in corrosive chemical process assemblies, where the broadest corrosion resistance of any standard Ni-Mo-Cr alloy and pinhole-free certification combine to provide reliable long-term barrier performance in aggressive acid, chloride, and mixed oxidizing/reducing process environments.
- ✦ Light-Tight Corrosion-Resistant Gaskets in Offshore Sensor Housings and Analytical Instrumentation
- Applied as light-tight corrosion-resistant gaskets in offshore sensor housings and analytical instrumentation in aggressive environments, where the combination of seawater corrosion resistance, pitting resistance in chloride solutions, and guaranteed optical barrier continuity is not achievable with less corrosion-resistant light tight foil options.
- ✦ Protective Cladding in Systems with Simultaneous Chloride, Acid and Barrier Continuity Requirements
- Used as protective cladding in systems where chloride exposure, acid contact, and strict barrier continuity are simultaneous requirements, where C276’s performance in both oxidizing and reducing media qualifies it as the reference barrier cladding material.
- ✦ Pinhole-Certified Barrier Stock for Electrochemical Corrosion Studies
- Provides pinhole-certified barrier stock for electrochemical corrosion studies in aggressive media, optical isolation in marine and chemical test rigs, and as a reference high-corrosion-resistance barrier foil for barrier integrity evaluation experiments where the specimen must itself resist the aggressive test environment.
Material Properties
| Element | Value |
|---|---|
| Hardness - Brinell | 80-200 |
| Elongation at break( % ) | 52 |
| Modulus of elasticity( GPa ) | 170-220 |
| Izod impact strength( J m⁻¹ ) | 42-100 |
| Tensile strength( MPa ) | 550-900 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 125-130 |
| Element | Value |
|---|---|
| Maximum use temperature in air( C ) | 1090 |
| Melting point( C ) | 1270-1390 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 427@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 10.1-12.5@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 10.8-11.3@20-100 |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.94 |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |