Of all the materials that have been used in the manufacture of sound recordings, the vinyl has proven to be the most stable of all. Moreover, although it may be said to be the most stable of all the materials used by recording manufacturers, there is no documental proof to say that its life's span is imprecise except to note that in preservation storage of vinyl sound recordings. It is stated that chemical deprivation of a vinyl disc in ordinary surroundings should not occur in less than 100 years. Vinyl discs are made of polyvinyl chloride (PVC) and a small percentage that is usually just about 25 % of fillers, preservative, tincture and anti-static substances. Polyvinyl chloride decomposes chemically when exposed to ultraviolet light or heat, releasing hydrochloric acid (HCl). The PVC stabilizer is therefore achieved by adding a chemical to the resin during manufacture. The PVC stabilizer is achieved by adding a chemical to the resin during manufacture. This does not put a stop to the degradation but controls it, mainly by its consumption of the free hydrochloric acid stablelizing the plastic phonograph disc. The vinyl disc is control mainly by its consumption of the free hydrochloric acid in stabling the plastic analogue disc in order to protect it for several years after pressing. The U.S. Patent Office is linked in many ways with the history of the phonograph ranging from the wax cylinder phonograph the gramophone through to Thomas Edison's Diamond Phonograph, but none more so than an incident that took place in 1890. In January of that same year, the manager of the Ohio Phonograph Company visited one of the oldest residents of the state, whose name was Horatio Perry a senior citizen who had reached the incredible age of 100. |
