In integrated circuit manufacturing, etching is one of the core processes that determine pattern transfer accuracy and yield. Whether it is ICP (inductively coupled plasma) etching, CCP (capacitively coupled plasma) etching, or high-density plasma systems used for deep silicon etching, the chamber, electrodes, RF matching network, and vacuum pump group all generate enormous thermal loads during long-term, high-power operation. If heat is not dissipated promptly and temperature is not precisely controlled, the process window may drift and etching uniformity may degrade, or worse, chamber seals and ceramic components may be damaged, leading to scrapping of entire wafer batches. Carrying this critical heat dissipation circuit is the high-purity cooling water hose, often overlooked by engineers yet indispensable.
1. Where Does the Thermal Load of Etching Equipment Come From
In ICP etching, a 13.56 MHz RF power supply excites the process gas into high-density plasma, where ion bombardment and radical reactions occur simultaneously on the wafer surface. RF power density can reach several W/cm², and the electrodes (usually made of aluminum alloy or quartz with a metal base) and chamber inner walls continuously absorb heat; the matcher, bias power supply, and pump group also run at full load. Taking a 300 mm wafer ICP etcher as an example, its cooling circuit must stably remove several kilowatts of continuous thermal power, and water temperature fluctuation must be controlled within ±1 ℃; otherwise the etch rate and selectivity will drift significantly.
2. Why High-Purity Cooling Water Hoses Are Mandatory
Semiconductor processes are zero-tolerant of contamination. If the inner wall of ordinary industrial hoses or stainless steel lines precipitates metal ions (such as Fe, Cr, Ni), sheds particles, or releases organic volatiles, they enter the equipment heat exchanger with the deionized water (DI Water) and may reversely contaminate the chamber or clog microchannels, directly lowering yield. Therefore, etcher cooling lines widely adopt 316L stainless steel EP grade (Electropolished) tubing or high-cleanliness hoses:
- The inner surface is electropolished to Ra ≤ 0.4 μm, greatly reducing particle adhesion and ion precipitation;
- Fittings are rinsed with high-purity water and cleanly packaged, meeting SEMI F57 / F4 cleanliness requirements;
- The 316L low-carbon formulation resists Cl⁻ and pitting, suitable for long-term DI water circulation.
3. Key Process Indicators for Cooling Water Hoses
In addition to material cleanliness, etcher cooling lines must pass rigorous reliability verification:
- Helium mass spectrometer leak test: leak rate better than 1×10⁻⁹ Pa·m³/s, eliminating slow leaks that degrade chamber vacuum;
- Pressure resistance and burst: safety margin several times the rated working pressure, matching equipment water pressure fluctuations;
- Cycle durability: passing thousands of durability cycles under bending, vibration, and temperature alternation without failure;
- Connector compatibility: seamlessly matching the equipment's VCR, ferrule, or flare interfaces to avoid micro-leaks.
4. KUNGFLEX SQ300 Series High-Purity Cooling Water Hose Solution
To meet the above requirements, KUNGFLEX (Kongfu / Jiangsu Kungfu Fluid Technology Co., Ltd.) launched the SQ300 series high-purity cooling water hose: made of 316L stainless steel, fully helium mass spectrometer leak tested, and passing 5000-cycle durability tests; the hose body is clean-treated inside and out, suitable for the cooling and process water circuits of semiconductor etching, CVD, cleaning, and lithography equipment. As a source factory with 17 years of fluid connector manufacturing experience and ISO 9001:2015 certification, KUNGFLEX has a 2000㎡ production workshop in Nantong, Jiangsu, and can provide semiconductor equipment manufacturers with one-stop services from selection, sampling, to batch delivery.
5. Selection and Maintenance Recommendations
When equipping an etcher with cooling water hoses, it is recommended to clarify first: ① medium (deionized water / process cooling water) and water temperature range; ② system working pressure and peak; ③ interface form (VCR / ferrule / flange); ④ piping space and minimum bend radius. After installation, it is recommended to perform helium leak detection and pressure holding for the first inspection; during operation, regularly inspect the connectors and the outer braid condition of the hose, and replace promptly if leakage or outer braid corrosion is found.
Conclusion
A high-purity cooling water hose may look like just "a pipe" in etching equipment, but it is actually an invisible gatekeeper ensuring process stability and wafer yield. Choosing a 316L high-purity cooling water hose that has undergone clean treatment, helium leak detection, and durability verification is the bottom-line requirement for the reliable operation of every high-end etcher. If you need to equip your equipment with the KUNGFLEX SQ300 series high-purity cooling water hose, please contact the KUNGFLEX technical team for selection support.
