|
 One of the important tasks of modern
technics is the creation of a new classof ecologically safe
heat-shielding and heat-insulating materials. It is caused by
the circumstance that the heat-insulating materials based on asbestos,
being known and widely used in an industry, already are forbidden
in USA and Europe as a result of cancerogenic properties of
these materials. Recently the materials based on ceramic fibers also were
recognized as cancerogenic, about that have informed the OSNA - administration
of USA on the professional public health, the California university and
the laboratory in Los-Alamos. In the advanced countries the volume of application
of ceramic fibres is sharply reduced and the works on their prohibition
are conducted.
The mentioned circumstances became
the reason of intensive development during the last years of
production and consumption of a new ecologically safe
multifunctional (warmly-, electro-, sound- protective) materials
based on the silica fibers
containing 98 -99 % SiO2. For the last 3 years
the production of a silica fibrous materials, which were applied
earlier in military and space technics ("Shatl" USA, "Buran" Russia), has
been increased in 5 - 7 times. The
main industrial base of such materials' production is in territory of
Russia. One of the known manufacturer of
the heat-shielding and heat-insulating silica based materials in Russia
is Joint-Stock Company " RLB Silika". The special interest represent
nonwoven
needled materials from the silica fibers
possessing the high insulation characteristics and the long-term stability
at temperature up to 1200 oC, the short-term
- up to 1700 oC. Nowadays such materials are being manufactured
under the trade mark Supersil. |
