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The use of natural emery papers is rare today generally being replaced with silicon carbide or pure aluminium oxide papers. Emery cloth has the abrasives bonded to a fabric instead of a paper. The cloth is more tear resistant, flexible, and costly. Emery boards have applications similar to emery paper or cloth. It also has a use in modelling.
Emery, or corundite, is a dark granular rock used to make an abrasive powder. The rock largely consists of corundum (aluminium oxide), mixed with other minerals. Industrial emery may contain a variety of other minerals and synthetic compounds. Crushed or naturally eroded emery (known as black sand) is used as an abrasive. Turkey and Greece are ...
Paper: Ordinary Paper Engineeringtoolbox 0.05 [5] Yarwood and Castle 0.125 [73] Oil Impregnated Paper 0.180 — 0.186 [32] 298 [5] 291.15 294.7 — 385.2 The oil-impregnated paper was about 0.05 inches thick and it was loaded under about 2 PSI. TPRC Volume 2, page 1127. Yarwood and Castle has the thermal conductivity of their paper on page 36 ...
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A metamorphic rock called emery that is mostly made of corundum which is an aluminum oxide. This is an example of an aluminum deposit. Aluminum is the third most abundant element in the lithosphere at 82,000 ppm. It occurs in low levels, 0.9 ppm, in humans. [1] Aluminum is known to be an ecotoxicant and expected to be a health risk to people.
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Natural emery is not very hard and may contain a significant quantity of hazardous free silica that's why it is no longer used for grinding wheels and even for "emery cloth" now made with aluminum oxide or silicon carbide grains as well as "sand paper". Still many people continue to use the term "emery wheel".
On average, a box of tissues has 65 sheets and breaks down to about 2 cents per sheet. However, a roll of toilet paper has nearly four times as many sheets as a box of tissues and costs half as much.
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