The term 'Big Name in Chemicals' can be summarized by two crossword solutions: DOW (3 letters) and OLIN (4 letters). Dow Chemical Company is an American multinational chemical corporation founded in 1897. It is one of the largest chemical manufacturers in the world and produces a wide range of products, including plastics, chemicals, and agricultural products. Olin Corporation is an American manufacturer and distributor of chemical products, primarily chlorine and caustic soda. Founded in 1892, it is one of the oldest chemical companies in the United States and has been a major supplier of industrial chemicals for over a century.