Thread Content
Electronic-grade sulfuric acid features high purity and low levels of impurities, which imposes strict requirements on the corrosion resistance and cleanliness of the materials used for valves and pipelines. Here are some commonly used materials: Pipe material – PTFE pipes: They possess excellent corrosion resistance, can withstand the attack of sulfuric acid at various concentrations, have a temperature range of -60°C to 190°C, and can handle certain pressures. At the same time, its smooth surface makes it less likely to absorb impurities, meeting the cleanliness requirements of electronic-grade sulfuric acid. It is commonly used in semiconductor manufacturing to transport ultra-pure chemicals, thereby preventing contamination by metal ions. - FRP pipes: Made of glass fiber reinforced plastic, they exhibit good corrosion resistance to sulfuric acid. Their typical operating temperature range is from -40°C to 120°C, and their pressure tolerance varies depending on the pipe diameter and wall thickness. Its advantages are light weight and high strength, but it may be slightly inferior to PTFE pipes in terms of cleanliness. Valve material – Fluorinated liner ball valve: Such as model Q41F46, the ball and seat are lined with polytetrafluoroethylene, providing excellent corrosion resistance. A special molding process is employed to ensure a dense sealing surface, and the combination of V-shaped PTFE packing enables the valve to achieve zero leakage. The applicable temperature range is usually between -50°C and 150°C, with pressure ratings ranging from PN16 to PN40. It features low fluid resistance, a smooth inner wall, unobstructed flow channels, rapid and easy operation, and can be equipped with various driving devices to enable remote control and automated operation. - Fluorine-lined globe valve: Such as the J41F46 type, where the valve disc and seat are lined with polytetrafluoroethylene. The applicable temperature range is approximately -50°C to 150°C, with pressures typically ranging from PN16 to PN25. It has good sealing properties and can effectively control the flow of fluids, but compared to ball valves, its flow resistance may be slightly higher. In addition, valves made of materials such as high-alloy stainless steel, 904L stainless steel, and ceramics are also used. High-alloy stainless steels and 904L stainless steel contain high proportions of elements such as chromium, nickel, and molybdenum, giving them excellent resistance to sulfuric acid corrosion. The valve core of the ceramic ball valve is made of ceramic material, which possesses extremely high hardness, corrosion resistance, and heat resistance, enabling it to withstand the erosion of highly corrosive substances such as sulfuric acid.