SUMCO supplies all kinds of silicon products for the semiconductor industry, ranging from single crystal silicon ingots to polished, epitaxial and SOI wafers. The high quality products meeting our customers needs ......SUMCO supplies all kinds of silicon products for the semiconductor industry, ranging from single crystal silicon ingots to polished, epitaxial and SOI wafers. The high quality products meeting our customers needs are made from raw materials with ultra-high purity under attentive quality control.