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
Spelling of disc in British English. The earlier word is "disk", which came into the English language in the middle of the 17th century. In the 19th century, "disk" became the conventional spelling for audio recordings made on a flat plate, such as the gramophone record. Early BBC technicians differentiated between "disks" (in-house transcription records) and "discs" (the colloquial term for commercial gramophone records, or what the BBC dubbed CGRs). By the 20th century, the "k" spelling was more popular in the United States, while the "c" variant was preferred in the UK. In the 1950s, when the American company IBM pioneered the