Shanghai Sigma High-Temperature Furnace Co., LTD is located at science zone of Shanghai city; the address of our company is Fuzhou Road in Shanghai of China. Our company possesses sixteen national patent inventions and many intellectual property rights. All the patent technology have been industrialized, applied to the technical progress of enterprises, making good social benefits, Our products have been sold to Qinghua University, Beijing Science University, Ha’erbing Industry University, Shenyang Chemistry Industry University, Fudan University, Tongji University, Xi’an Traffic University, Zhejiang University, Zhenzghou University, Chinese Science College, Shanghai Silicate Study, Chongqing University, South Korea, Vietnam and Malaysia etc. The ‘Sigma’trademark has been registered in CTMC. The brand effect of ‘Sigma’has been developed rapidly and upgraded constantly in the field.