English
Application Scenarios for Clean Stainless-Steel Tubing
(Including V+V / VIM+VAR Ultra-High-Purity 316LVV)
Key Characteristics
Clean stainless-steel tubing features BA (bright annealed) or EP (electropolished) inner surfaces, low particle generation, low extractables, helium leak-test capability, and corrosion resistance.
V+V refers to the VIM+VAR double-vacuum melting process used to purify the material. It is intended for the most demanding ultra-high-purity (UHP) applications, primarily in semiconductor manufacturing and high-end precision gas-delivery systems.
1. Semiconductor and Display Panels
(The primary application for V+V tubing)
-
UHP specialty-gas piping in wafer fabs, handling high-purity process gases such as silane, ammonia, hydrogen chloride, nitrogen trifluoride, and other 5N–8N gases.
-
Gas-delivery systems for CVD, ALD, etching, diffusion furnaces, and related processes. These systems follow SEMI F20 requirements and tightly control particles and metal-ion extractables to protect yield.
-
Ultra-pure water (UPW) transfer lines for wafer-cleaning loops, typically at 18.2 MΩ·cm.
-
High-purity chemical and carrier-gas distribution systems in LCD/OLED production lines.
-
Internal gas lines, vacuum lines, and valve-manifold base piping within semiconductor equipment.
2. Biopharmaceuticals and Biotechnology
(GMP / FDA environments)
-
Water for Injection (WFI) and purified-water circulation systems.
-
Product-transfer piping and bioreactor connections for vaccines, monoclonal antibodies, antibiotics, and APIs.
-
Systems requiring CIP cleaning and SIP sterilization with steam at 121°C. Smooth, crevice-free internal surfaces help minimize biofilm adhesion.
-
High-purity reagent piping in laboratories and R&D platforms.
3. Food and Beverage
(Sanitary clean tubing; V+V is rarely required)
-
Product-transfer lines for dairy, beer, juice, condiments, and carbonated-beverage production.
-
Piping for food additives, flavorings, and CIP cleaning systems, meeting food-hygiene requirements.
-
Typically uses sanitary-grade 304 or 316L tubing.
4. Laboratories, Analytical Instruments, and Research Clean-Gas Systems
-
Carrier-gas piping for precision analytical instruments such as gas chromatographs and mass spectrometers, including nitrogen, argon, and hydrogen.
-
Distribution systems for high-purity air and inert gases in clean research, chemical, and physical laboratories.
-
Clean compressed-air and dry-air piping with extremely low dew points and no oil or particles also falls into this category. BA-grade clean stainless steel is commonly used; V+V EP tubing is selected for exceptionally stringent requirements.
5. Medical Systems
-
Central oxygen, medical vacuum, and medical compressed-air piping in hospitals, operating rooms, and ICUs.
-
Fluid lines for dialysis equipment and medical purified-water systems.
-
V+V ultra-high-purity material is generally reserved for implant-grade components. Standard 316L clean tubing is normally sufficient for typical hospital piping.
6. Solar, Lithium-Battery, and New-Energy Manufacturing
-
High-purity gas delivery for photovoltaic silicon-wafer growth and etching.
-
High-purity inert-gas protection and electrolyte-transfer piping in lithium-battery production lines.
7. Other High-End Industrial Applications
-
Fine chemicals: high-purity reagents and solvents where low metal-ion extractables are required.
-
Nuclear power and aerospace: V+V UHP tubing for corrosion-resistant, low-outgassing, non-magnetic critical fluid systems.
-
Advanced instruments and vacuum equipment: vacuum lines and gas-supply/sampling lines for sensors and high-end instruments.
Quick Selection Guide
| Application | Recommended Tubing Grade | Material Notes |
|---|---|---|
| Semiconductor UHP specialty gases, top-tier vacuum systems, or precision sensor gas lines | V+V (VIM+VAR) + EP electropolishing | 316LVV with extremely low impurities; Ra ≤ 0.2 μm or lower; highest cost |
| Pharmaceuticals, standard clean laboratories, and dry clean compressed air | EP electropolished or BA bright annealed | Standard 316L; cost-effective |
| Food and beverage sanitary piping | Sanitary AP/BA welded tubing | 304/316L; lower requirements than the categories above |
Key Points
-
V+V is not a surface treatment. It is a material-purification process achieved through vacuum melting.
-
Surface finish is achieved later through BA or EP processing. V+V material combined with EP finishing is required for semiconductor UHP piping systems.
-
For clean compressed air, BA tubing is adequate for most projects. Upgrade to V+V + EP tubing only where ultra-low dew point, ppb-level particle control, or gas supply for sensors and precision analytical equipment is required.