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 Silica
materials have low thermal conductivity, high resistance to thermal shock, have
superb electric insulation properties at high temperatures, can be used for a
long period of time without changing of their properties at the temperature 1000
C (on new material PURESIL up to 1200 C) and for a short period of time at
higher temperatures (do not melt, do not evaporate at the temperature up to 1700
C).
Articles made of silica glass are
extremely inert to the majority of chemical reagents, resistant to organic and
mineral acids of any concentration even at the elevated temperature (except of
hydrofluoric, phosphoric and hydrochloric acid) and weak alkalis of molten
metals (except of Mg, Na, Si) and alloys. They have high chemical resistance to
water and steam of high pressure, are capable to absorb moisture, but are not
split in the presence of water, stable in vacuum.
The given materials are superb high
temperature thermal insulation and thermal protection materials, used in many
branches of industry. In the CIS countries these are first of all the
enterprises of military-industrial complex, as well as the enterprises,
manufacturing thermal insulation articles and glass plants. In foreign countries
silica materials are used as replacement of asbestos and are used mainly in
refinery, electro technical, aerospace industries, in metallurgy and
shipbuilding.
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Silica fabrics
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Silica fabrics are used as high
temperature insulation, thermal protection for different branches of
technique, namely for refractory padding, gaskets and blankets, protecting
from flame, splashes of molten metal, excessive heat, as a filler for
composite materials, for manufacture of filters used for cleaning of the
corrosive medium.
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Silica meshes
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They are used as an effective
filtering material for cleaning of melts of ferrous and non-ferrous metals
while pouring of them into the moulds. The filter of necessary size is cut and
installed into the gating system or directly under the pouring gate between
the bottom and top molding boxes of a mould.
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Silica yarns
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They are equalized twisted yarns.
They are made of glass N 11 or new material PURESIL in several plies. In
future the produced yarn is subjected to chemical and thermal treatments.
After that the produced yarn is wound on cones. For special fields of
application, which do not allow presence of shrinkage at the influence of
temperatures such yarns are manufactured which possess all the above mentioned
properties, but they are additionally finished for phenol or epoxy binding and
have minimum shrinkage at the operating temperature.
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Silica fiber
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Recently silica fiber has been
forming at the enterprise as production waste, but still it has been a
valuable product, used as thermal insulation materials. Since 1996 production
capacities have been created for production of silica fiber as a separate
type. Besides that our enterprise manufactures chopped silica fiber which is
reinforcing material in different friction articles.
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Silica felts
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Silica felts are a combination of
fluffy fiber, which is in a shell made of silica fabrics. The main field of
application of these materials: insulation of high-temperature sections on
atomic station and refinery plants. They are a superb high temperature thermal
insulation and thermal protection, can be used for a long period of time
without changing of the properties at the temperature 1000 C (on new material
PURESIL up to 1200 C) and for a short period of time at higher temperatures
(do not melt, do not evaporate at temperatures up to 1700 C).
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Ready-made articles made of
silica materials
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The most widely used are fire
protective blankets, designed for localization of burning at the initial stage
of fire, as well as for extinguishing of clothes of an injured person by means
of stopping of oxygen supply. The blankets are made of silica fabrics. The
given article satisfies the requirements of the Russian Sea Register of
Navigation. Fire protective blanket is folded and packed into a bright red
container, which is put on a wall or fire shield and in case of necessity it
can be put into operating state very quickly. The objects where application of
a given article is necessary - departments and laboratories of industrial
enterprises, airports, schools, hospitals and so on. The production of
analogous articles: blankets, curtains is based on high thermal insulation and
fire resistant properties of silica fabrics and they are used mainly for
extinguishing of domestic fires (kitchen stoves and bake ovens).
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