Buffer etchant is a key chemical solution used in the semiconductor industry for precise control of silica etching, mainly composed of hydrofluoric acid and ammonium fluoride. With its stable etching rate and excellent surface flatness, it plays a key role in a wide range of processes such as precision etching of silica, selective etching of silicon nitride, and MEMS and 3D IC manufacturing. This product has the advantages of ultra-high purity, low particulate matter, controllable concentration and high precision, which can meet the requirements of customers' formula and high quality.