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The condition of the material at hand determines what type of abrasive will be applied. The first stage, if the material is unfinished, starts with a rough abrasive (perhaps 60 or 80 grit) and each subsequent stage uses a finer abrasive, such as 120, 180, 220/240, 320, 400 and higher grit abrasives, until the desired finish is achieved.
Buffered oxide etch (BOE), also known as buffered HF or BHF, is a wet etchant used in microfabrication.It is a mixture of a buffering agent, such as ammonium fluoride NH 4 F, and hydrofluoric acid (HF).
In 1935, it became the Metal Polishers', Buffers', Platers' and Helpers' International Union, [2] and in 1955, it transferred to the new AFL-CIO. By 1957, its membership had grown to 25,000, [ 3 ] but by 1980 it had fallen back to 10,000.
Floor buffers or rotary floor machines use rotary brushes of a soft material to clean, scrub, and polish linoleum surfaces. For marble and wood floors, floor polishers may be used to apply protective coating to the floor. [1] Floor burnisher is the term for a high speed floor buffer that rotates its pad at over 1000 RPM.
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The Britton–Robinson buffer (BRB or PEM) is a "universal" pH buffer used for the pH range from 2 to 12. It has been used historically as an alternative to the McIlvaine buffer , which has a smaller pH range of effectiveness (from 2 to 8).
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