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A twelve-inch Capitol Records gramophone record. The twelve-inch single (often written as 12-inch or 12″) is a type of vinyl (polyvinyl chloride or PVC) gramophone record that has wider groove spacing and shorter playing time with a "single" or a few related sound tracks on each surface, compared to LPs (long play) which have several songs on each side.
Culture Club "Move Away" 5-inch picture disc, example of the 5-inch format resting on a 7-inch single for comparison. The most common diameter sizes for gramophone records are 12-inch, 10-inch, and 7-inch (300 mm, 250 mm, and 180 mm). [1]
In addition to paper, backing for sandpaper includes cloth (cotton, polyester, rayon), PET film, "fibre", and rubber. Cloth backing is used for sandpaper discs and belts, while PET film is used as backing for extremely fine grits. Fibre or vulcanized fibre is a strong backing material consisting of many layers of polymer impregnated paper. The ...
Used for sanding corners and very tight spaces. Also known as "mouse" or "corner" sanders. Disc sander: A disc sander is most commonly implemented as a stationary machine that consists of a replaceable circular shaped sandpaper attached to a wheel turned by an electric motor or compressed air. The usually wooden work piece, (although other ...
The new product was a 12- or 10-inch (30 or 25 cm) fine-grooved disc made of PVC ("vinyl") and played with a smaller-tipped "microgroove" stylus at a speed of 33 + 1 ⁄ 3 rpm. Each side of a 12-inch LP could play for about 25 minutes, allowing for a total runtime of approximately 50 minutes.
The 10-inch discs, mostly used for popular and light classical music, were normally pressed in shellac, but 12-inch discs, mostly used for "serious" classical music, were pressed in Victor's new vinyl-based "Victrolac" compound, which provided a much quieter playing surface. These records could hold up to 15 minutes per side.