Carbon fiber reinforced polymer as epoxy, but other thermoset or thermoplastic polymers, such as polyester, vinyl ester, or nylon, are sometimes used. The composite material may contain aramid (e.g. Kevlar, Twaron), ultra-high-molecular-weight polyethylene (UHMWPE), aluminium, or glass fibers in addition to carbon fibers. The properties of the final CFRP product can also be affected by the type of additives introduced to the binding matrix (resin). The most common additive is silica, but other additives such as rubber and carbon nanotubes can be used. The material is also referred to as "graphite-reinforced polymer" or "graphite fiber-reinforced polymer" ("GFRP" is less common, as it clashes with
Berliner Gramophone though this has since been disproven. The Kämmer & Reinhardt venture did not last very long, though just how long is unclear. In the early 1890s, Berliner attempted to found his first American company, the American Gramophone Company, in New York City, but it fell apart before issuing a single machine or disc. Back in Washington, D.C., Berliner tried again under the name of the United States Gramophone Company and began to manufacture machines and 7-inch hard rubber discs in 1894. Some celluloid discs were also made. In 1895, hard rubber was replaced by a shellac compound, which in various