 The company manufactured natural rubber products at the Hamilton Square location from 1866 until the 1930s, and synthetic rubber products from the 1930s until the location was closed in 1993.According to the company's web site, Mercer Rubber "started manufacturing mason jar gaskets and other small molded products in 1866" and "moved on to conveyor belting, customized industrial hose, and ultimately, expansion joints" around the beginning of the 20th century.Significant controversy exists regarding Mercer Rubber Company's former Hamilton Square, New Jersey location and Frederick Sayen's former home at 155 Hughes Drive, directly across Mercer Street from the now demolished Rubber Company site.