American Gypsum Company is a manufacturing company in Duke, Oklahoma. American Gypsum has been manufacturing, selling, and distributing gypsum wallboard products for over 40 years. Serving the drywall industry with quality products that are sold throughout the United States. A unique, professional commitment to the highest level of customer service; a strong belief in teamwork; investment in employee training; and state-of-the-art manufacturing equipment create a consistent quality product and a company that surpasses the industry.