How Should UNS R60702 Zirconium Foil Thickness Be Specified?
- UNS R60702 Zirconium Foil
UNS R60702 zirconium foil is a commercially pure zirconium product used where seal reliability and long-term corrosion resistance are required. The standard supplied thickness range is 0.02 to 1.0 mm, with special ultra-thin products available down to 0.005 mm for selected applications. This article explains thickness selection under ASTM B551, compares mechanical and corrosion-related behavior across thickness ranges, and provides practical selection guidance for chemical processing, electrolysis, electroplating, energy systems, and precision equipment.
How Is UNS R60702 Zirconium Foil Classified by Thickness?
What Does ASTM B551 Mean for Strip, Sheet, and Foil Terminology?
ASTM B551 covers zirconium and zirconium alloy strip, sheet, and plate. Under strict dimensional terminology, strip is generally material below 4.8 mm thickness with width below 610 mm, while sheet is below 4.8 mm thickness with width of 610 mm or greater. In international industrial practice, material below 0.1 mm or 0.15 mm is more strictly called foil. Therefore, when discussing ASTM B551, 0.3 to 1.0 mm products should be described more rigorously as zirconium sheet, strip, or foil products, rather than only as conventional foil.
What Thickness Tolerances Are Used?
Industrial UNS R60702 zirconium foil and strip may be supplied with thickness tolerances from ±0.005 mm for conventional grades to ±0.002 mm for precision grades. A twenty-high precision rolling mill, controlled intermediate annealing, and real-time thickness measurement help maintain widthwise uniformity.
How Does Thickness Affect Performance?
As thickness decreases from 1.0 mm to 0.02 mm, tensile strength can rise because of work hardening, while elongation generally decreases. Thickness reduction does not materially increase the intrinsic thermal conductivity of zirconium. Instead, thinner foil reduces thermal resistance and can increase heat transfer per unit time in assemblies.
What Are the Main Thickness Grades and Properties?
What Should Be Expected from 0.3 to 1.0 mm Products?
| Thickness Range | Tensile Strength | Elongation | Typical Applications | Corrosion-Resistance Reference |
|---|---|---|---|---|
| 0.8 to 1.0 mm | <=340 MPa | >=22% | Flange gaskets and reactor linings | 10 years in hydrochloric acid <=37% at 25 °C, subject to detailed conditions |
| 0.5 to 0.8 mm | <=360 MPa | >=20% | Pipe seals and valve diaphragms | Mixed-acid service with engineering review |
| 0.3 to 0.5 mm | <=380 MPa | >=18% | Heat-exchanger baffles and filter screens | Organic-acid environments |
This thickness range combines structural integrity and formability. A density of 6.51 g/cm3 keeps areal weight manageable; 0.3 mm material is about 2.0 kg/m2.
What Are the Critical Indicators for 0.1 to 0.3 mm Precision Material?
Precision UNS R60702 material is produced through multiple cold-rolling passes with controlled texture. Electrical conductivity of approximately 2.36 × 10^6 S/m supports electrode substrate applications, while nonmagnetic behavior suits precision shielding.
What Are the Limits of 0.02 to 0.1 mm Ultra-Thin Foil?
Ultra-thin zirconium foil is used for vacuum coating backing materials, micro fuel-cell current collectors, weight-sensitive aerospace seals, and precision electronic structures. Burr height should be controlled to <=5 µm and flatness to <=0.5 mm/m for automated assembly.
How Should Thickness Be Matched to Applications?
How Should Foil Be Selected for Strongly Corrosive Chemical Environments?
For hydrochloric acid up to about 20%, 0.5 mm zirconium material may provide long service life when temperature and impurities are controlled. Concentrated sulfuric acid and aqua regia-type systems require thicker material and detailed corrosion testing. Zirconium must not be used in hydrofluoric acid or fluoride-containing media because fluoride rapidly destroys the zirconium oxide passive film and can cause severe corrosion and hydrogen embrittlement. Suitable strong-acid examples include hydrobromic acid, perchloric acid, or specified nitric acid conditions.
What Thicknesses Are Used in Electrolysis and Electroplating?
| Application Type | Recommended Thickness | Current Density | Service Life |
|---|---|---|---|
| Alkaline water electrolysis anode | 0.15 to 0.25 mm | 500 to 800 A/m2 | >15000 h |
| Electroplating tank diaphragm | 0.1 to 0.15 mm | 200 to 400 A/m2 | >8000 h |
| Ion-membrane cell frame | 0.3 to 0.5 mm | Structural support | >87600 h |
Electrochemical applications require a balance between electrical resistance and mechanical strength. Surface activation coatings such as IrO2-Ta2O5 generally require a substrate thickness of at least 0.15 mm.
How Are New-Energy and Precision-Instrument Thicknesses Customized?
Ultra-thin 0.05 to 0.08 mm UNS R60702 zirconium foil may be evaluated as a specialty current collector or corrosion-resistant support in advanced battery systems. A 0.1 mm product can be used for fuel-cell bipolar plate development, where stamped channel depth, contact resistance, and corrosion behavior must be validated.
How Is Quality Verified?
How Are Thickness and Tolerance Measured?
Beta-ray backscatter gauges or laser thickness systems with approximately ±0.001 mm measurement precision can scan the full width. Ultra-thin foil below 0.1 mm should also be locally verified with optical or interference microscopy.
What Surface Quality Is Required?
Defects such as pinholes above 0.1 mm, scratches deeper than 5% of thickness, and inclusions above 2 mm2 should be rejected for high-reliability chemical service.
| Application Field | Roughness Requirement | Test Standard |
|---|---|---|
| Pharmaceutical equipment lining | Ra <=0.4 µm | ISO 4287 |
| Electronic component substrate | Ra <=0.6 µm | ASME B46.1 |
| Chemical sealing gasket | Ra <=0.8 µm | DIN 4768 |
How Are Mechanical Properties and Corrosion Resistance Tested?
Tensile testing should follow ASTM E8. Annealed material should pass 180° bend testing at the specified bend radius. Corrosion assessment may combine ASTM G31 weight-loss testing and electrochemical impedance spectroscopy.
What Supply Capabilities Are Available?
What Custom Specifications Can Be Produced?
Baoji Titanium Valley Titanium Nickel Zirconium Material Processing Co., Ltd. operates a 750 mm twenty-high precision mill and supplies 0.02 to 1.0 mm zirconium products, with coil widths up to approximately 680 mm.
How Is Traceability Maintained?
Each coil should have a unique batch number linked to melt heat number, rolling parameters, annealing record, and inspection results.
Which Standards and Certifications Apply?
Products may be supplied to ASTM B551, ASTM B752 where applicable, and EN 10204 3.1 certificate requirements. ISO 9001:2015, ISO 14001, REACH, and RoHS documentation can support export projects.
What Is the Selection Conclusion?
UNS R60702 zirconium thickness selection must consider corrosion media, mechanical load, fabrication process, and cost. Standard 0.02 to 1.0 mm supply with precision tolerance control can support laboratory development through industrial production when ASTM terminology and service limitations are stated accurately.
What Questions Do Buyers Commonly Ask?
Can 0.05 mm Zirconium Foil Be Used for High-Pressure Sealing?
Ultra-thin zirconium foil below 0.1 mm is recommended only for low-pressure sealing or multilayer composite structures. High-pressure service should generally use material of at least 0.3 mm with appropriate reinforcement.
How Can Stamping Tolerance Be Verified?
Automated stamping generally requires thickness uniformity of about ±0.003 mm. Full-width gauge data should be reviewed before setting die clearance.
How Much Does Corrosion Rate Differ by Thickness?
In a boiling 20% hydrochloric acid reference environment, 0.5 mm material may show around 0.08 mm/year, while ultra-thin foil may require additional corrosion allowance. Actual values must be verified under service conditions.
How Can You Source UNS R60702 Zirconium Foil?
Baoji Titanium Valley Titanium Nickel Zirconium Material Processing Co., Ltd. supplies UNS R60702 zirconium foil, strip, and sheet products with custom thicknesses and stable batch production. Contact sales@titaniumvalleys.com for technical data and application support.
References
1. Zhang Jianjun, Li Minghua. Study on Precision Rolling Process, Microstructure, and Properties of Industrial Pure Zirconium Foil[J]. Rare Metal Materials and Engineering, 2021, 50(8): 2845-2852.
2. National Technical Committee for Nonferrous Metals Standardization. GB/T 26315-2010 Zirconium and Zirconium Alloy Plate, Sheet, Strip, and Foil[S]. Beijing: Standards Press of China, 2010.
3. Wang Xiaodong, Zhao Guoqiang. Surface Quality Control Technology for Ultra-Thin Zirconium Foil and Its Application in Electrochemical Fields[J]. The Chinese Journal of Nonferrous Metals, 2022, 32(3): 678-689.
4. Handbook of Rare Metal Materials Processing[M]. Beijing: Metallurgical Industry Press, 2015.