Listing description
EMERY Man-made emery is a regular aluminum oxide containing a
small amount of ferric oxide. This addition gives high durability. Emery is recommended
for hand polishing of ferrous and nonferrous materials.
Emery (or corundite) is a dark granular rock used to make
abrasive powder. It largely consists of the mineral corundum (aluminium oxide), mixed with other species such as the
iron-bearing spinels, hercynite, and magnetite, and
also rutile (titania). Industrial emery may contain a
variety of other minerals and synthetic compounds such as magnesia, mullite, and silica.
Detailed description
It is black or dark grey in colour, less dense than
translucent-brown corundum with a specific gravity of between 3.5
and 3.8. Because it can be a mixture of minerals, no definite Mohs
hardness can be assigned: the hardness of corundum is 9 and
that of some spinel-group minerals is near 8, but the hardness of others such
as magnetite is near 6.
Crushed or naturally eroded emery (known as black
sand) is used as an abrasive — for example,
on an emery board and emery cloth, as a traction
enhancer in asphalt and tarmac mixtures.
Turkey and Greece are the main suppliers of the
world's emery. These two countries produced about 17,500 tons of the mineral in
1987.[1]
The Greek island of Naxos used to be the main source
of this industrially important rock type. It has been mined on the eastern side
of Naxos for well over two thousand years until recent times. However, demand
for emery has decreased with the development of sintered carbide and
oxide materials as abrasives.
A small quantity of emery is used in coated abrasive
products, but its main use in the United States is wear-resistant floors and
pavements.Many tons are
shipped to Asia to be used in grinding rice.
The Occupational
Safety and Health Administration in the US has
set permissible exposure limits for emery in the workplace: TWA 15 mg/m3total exposure and TWA 5 mg/m3 respiratory
exposure.
PRICE
$20/KG OR $9.09/IB
For more information:
mobile: +2348039721941
contact person: emeaba uche
e-mail: emeabau@yahoo.com
Comments
Post a Comment