Deionized Water (DI Water) is water that has undergone ion exchange to remove dissolved cations (e.g., calcium, sodium) and anions (e.g., chloride, sulfate). While this process effectively eliminates minerals and salts, traces of microorganisms, organics, and particulates may still remain. DI water typically has a resistivity of 1–18 MΩ·cm and is commonly used in industrial processes, laboratories, and general cleaning. Though its purity is lower than ultrapure water, its low conductivity makes it suitable for electronics and electrical applications.

Ultrapure Water (UPW) undergoes more advanced purification stages than DI water, removing virtually all forms of impurities, including ions, organics, microbes, and particles. UPW is essential in semiconductor, pharmaceutical, and nanotechnology industries, where even trace contaminants can compromise product performance.
In semiconductor manufacturing, a single particle or ion on a wafer with microscopic circuit patterns can cause defects. Therefore, UPW is indispensable for wafer cleaning, contamination control, pattern accuracy after CMP (Chemical Mechanical Planarization), electrostatic discharge prevention, and ensuring chemical process stability—all of which are critical for product quality and yield.

Jeongdo Machinery’s Oil-Free Butterfly Valve is specifically engineered to meet the stringent requirements of ultrapure water (UPW) lines, especially in semiconductor manufacturing environments. Each component is subjected to a two-stage cleaning process using IPA (Isopropyl Alcohol)—once prior to assembly and again post-assembly—to minimize residual contamination. Furthermore, a white light particle inspection is conducted to identify and remove even microscopic particulate matter.

All cleaning and assembly operations are performed in a dedicated cleanroom environment, ensuring strict contamination control and consistent valve performance in critical UPW applications.

The valve’s oil-free design prevents contamination or foreign particle ingress, safeguarding fluid purity. These features have made Jeongdo Machinery’s oil-free butterfly valve a trusted solution in high-purity process systems, particularly in semiconductor and advanced manufacturing facilities.