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~ Founded as pioneer of introducing Chemical Gypsum ~
     Our Company was originally founded in 1910 by KamejiroYamada, as Yamakame Seafood
 Wholesaler.   In 1939, we focused attention on acetous gypsum, a by-product generated by
Nankai Chemical Industry Co., Ltd., located in Wakayama City. Following research into this material, we started selling the material under the product name of Chemical Gypsum to cement companies.   We became the pioneer in introducing chemical gypsum to the cement industry in Japan. Because of the economic restriction imposed during WWII, we stopped handling seafood, and decided to dedicate our efforts to chemical gypsum.   In 1948, after the war ended, the present Yamada Sangyo Co., Ltd. was founded by Kamejiro’s son, Takao.
~ Earned strong presence in the industry, along with chemical gypsum. ~
     Chemical gypsum is a by-product generated by different types of manufacturers. Since its production depends on trends in the main products of manufactures and its component is affected by manufacturing methods, it is difficult to keep and improve quality. To solve this problem, we have consistently stayed in close relationships with cement companies and gypsum manufacturers, emphasizing on them about the importance of quality improvement for the future of chemical gypsum.
     Moreover, we have cooperated with users and manufacturers to streamline manufacturing processes, at the same time; we have promoted the importance of chemical gypsum to the industry. As a result, we and our products have strong presence in the industry.
     Technological innovations during the period of rapid economic growth
during 1955-1975 enabled various companies to make rapid strides in
developing their business, but also prompted the introduction of environmental regulation such as Air Pollution Prevention Law and Mine Safety Law. Accordingly, many types of chemical gypsum were developed, for example flue-gas desulfurized gypsum, phosphogypsum, titanogypsum, mine water’s and scouring gypsum and fluorogypsum.
     Lately, in order to respond to demands of gypsum for new applications, such as for soil solidification, fireproof board and cement products, we’ve been introducing some new types of gypsum to the industry.
~Started importing gypsum. ~
      At the same period, all domestic natural gypsum mines were closed, for financial reasons. Since then, chemical gypsum has needed to cover all domestic demands. Moreover, the significant development of gypsum board industry around 1985, and the steady growth of the cement industry increased demands for gypsum as raw materials.
     Since the infeasibility of depending solely on domestic chemical gypsum, the necessity of importing gypsum from overseas has been emerged.
     We concluded direct trading agreements with some mining companies in Thailand and Mexico, to enlarge the volume of imported natural gypsum. Demand for gypsum has continued to grow in recent years, with new applications, such as in-soil solidification agents and fireproof boards.
~ Expanded to new by-product materials such as slag. ~
     Throughout our gypsum business, we’ve been acquiring experience and strong networks dealing in by-product material. In order to take maximum advantage of our capability, we started dealing in new by-product raw materials, such as granulated blast furnace slag, air cooled slag, ferric oxide materials, and copper slag. These new types of slag are generated at steelmills plants and smelting plants, and used for slag cement, roadbed, and so on. Especially, these types of slag received high evaluation as recycled materials for cement industry to save resources and energy.
     Transaction volume is increasing year by year not only by high domestic demands, but also by overseas demands through the rapid economic growth, especially in Asia.
     We will definitely contribute to the global economy and environment by cooperating with our partner companies to encourage and promote efficiency and recycling of by-product in ceramic industry.
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