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Egypt
N º de Modelo:
mica
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Egypt
Persona de contacto Mr. mohamed
cairo, cairo, cairo
Luster
Dull to pearly, bronzy
Streak
Greenish white
Diaphaneity
Translucent
Specific gravity
2.**2.6
Pleochroism
X in paler shades than Y and
General
Mica are sheet silicates historically significant for their
ability to be split into large, thin sheets that are uniquely
useful for their electrical, thermal, and mechanical properties.
They have high electrical and thermal insulating properties; they
are resistant to chemical attack; they can be split into
transparent or optically flat films; and they can be cut or stamped
to shape .
-it have several types :
*- Sheet mica Sheet mica consists of “books” of mica laminate and
is classified according to the thickness, purity, and maximum
usable area that can be cut or stamped.
*- Built-up mica Also known as micanite, built-up mica is a
fabricated sheet of desired thickness made by overlapping
irregularly shaped splittings and then binding them together with
an organic or inorganic binder, heat, and pressure ,it is produced
as an alternative to natural sheet mica for electrical insulation
applications..
*- Mica paper Mica paper is a fabricated alternative to natural
sheet and builtup mica products. Scrap mica is delaminated through
a combination of thermal, chemical, and mechanical treatments , on
a papermaking machine into a continuous, homogeneous sheet of
uniform thickness..
*- Flake mica Flake mica is essentially nonfactory-generated scrap
mica. It is recovered by flotation from mica ores, from which
quartz and feldspar are also generally separated and recovered, or
as a floated byproduct during the beneficiation of feldspar,
kaolin, or lithium-bearing ores.
Uses :
*- Joint cements : muscovite is used in drywall joint compounds,
where it contributes to consistency and workability, smooth surface
finish,and resistance to shrinkage and cracking.
*- Coatings Fine-ground, ***5 mesh and micronized mica grades are
used in paint as a pigment extender and for dry film reinforcement.
The inert, platy mica improves suspensi
on stability, controls film checking, chalking, shrinkage, and
blistering, improves resistance to weathering, chemicals, and water
penetration, and improves adhesion to most surfaces. Coarser grinds
are used in textured paints, and wet-ground mica is used in high
quality exterior house paints. High aspect ratio grades are
preferred for porous surface sealers
to seal pores, control penetration, and reduce sagging and film
cracking.
*- Plastics Finely ground, ***5 mesh and micronized micas are used
in plastics to improve electrical, thermal, and insulating
properties. Mica is considered the most effective mineral for
reducing warpage and increasing stiffness and heat deflection
temperature in plastics. In general, mica reinforces crystalline
better than amorphous polymers. Best results are obtained with
nonpolar polymers when mica is pretreated with a coupling agent to
improve wetting. Mica is used in both thermoplastics and
thermosets. Its largest single use is in
polyolefins, even though it requires stabilizers to prevent
degradation of polypropylene.
*- Drilling fluids Coarse, hammermilled (**0 mesh) mica is used in
waterbased oilwell drilling fluids to prevent fluid loss into
porous rock formations. The coarse mica flakes bridge openings and
seal porous sections of the drill hole against loss of circulation.
Mica’s platy nature also aids in the suspension of drilling fluid
solids and cuttings.
*- Ground mica is used as an asbestos substitute in certain thermal
boards, brake linings, gaskets, and cement pipes, as a filler and
nonstick surface coating for roll roofing and asphalt shingles, as
a mold lubricant and release agent in the manufacture of tires and
other molded rubber goods, as a flux coating on welding rods, and
as a pearlescent pigment in wallpapers.
País: | Egypt |
N º de Modelo: | mica |
Precio FOB: | ( Negotiable ) Obtener el precio más reciente |
Lugar de origen: | - |
Precio de pedido mínimo: | - |
Cantidad de pedido mínimo: | - |
Detalle de embalaje: | - |
El tiempo de entrega: | - |
Capacidad de suministro: | - |
Tipo de pago: | T/T, D/P, PayPal, Other |
Grupo de productos : | - |