Chemical Property of Mullite
Chemical Property:
- Melting Point:>1650°C
- Density:2.6-2.7 g/cm3
- Storage Temp.:Store at +5°C to +30°C.
- Hydrogen Bond Donor Count:0
- Hydrogen Bond Acceptor Count:13
- Rotatable Bond Count:0
- Exact Mass:425.776974
- Heavy Atom Count:21
- Complexity:52.4
- Purity/Quality:
-
99.9% *data from raw suppliers
Aluminium oxide fibers for gooch crucibles *data from reagent suppliers
Safty Information:
- Pictogram(s):
T
- Hazard Codes:T
- Statements:
49
- Safety Statements:
53-45
- MSDS Files:
-
Total 1 MSDS from other Authors
Useful:
- Canonical SMILES:O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Si]=O.O=[Si]=O
- Recent ClinicalTrials:Xia Shi Surgical Treatment for Eczema Multi-center Clinical Research
- Inhalation Risk:A harmful concentration of airborne particles can be reached quickly.
- Effects of Short Term Exposure:May cause mechanical irritation to the respiratory tract, eyes and skin.
- Effects of Long Term Exposure:Lungs may be affected by repeated or prolongated exposure. This substance is possibly carcinogenic to humans.
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Description
Aluminosilicate fibers (commonly called refractory ceramic
fibers (RCFs) in the United States) are amorphous fibers
belonging to a class of materials termed synthetic vitreous
fibers (SVFs), also termed man-made mineral fibers or manmade
vitreous fibers. This class of materials also includes glass
wool, rock (stone) wool, slag wool, mineral wool, and specialpurpose
glass fibers. Fibers can be classified in various ways,
such as natural versus synthetic, organic versus inorganic, and
crystalline versus amorphous. Several fiber taxonomies have
been proposed.Aluminosilicate wools (ASWs) were first invented in the
early 1940s and commercialized in the 1950s in the United
States and somewhat later in other countries. Substantial
energy price increases beginning in the 1970s increased the
economic benefits of energy conservation and the market for
these fibers.ASWs are SVFs produced by melting (at ～1925°C)
alumina, silica, and other inorganic oxides, and then blowing
or spinning these melts into fibers. These fibers can also be
produced by melting blends of calcined kaolin, alumina, and
silica. The bulk fibers produced by this process can be used
directly for some applications, but are more commonly converted
into other physical forms, including blanket, modules
(folded blanket capable of being installed rapidly in industrial
furnaces), paper, felt, board, vacuum formed parts, textiles, and
putties or pastes. Conversion to various physical forms takes place at locations where aluminosilicate fibers are produced,
facilities operated by converters (producers of intermediate
goods) or end users. Primary manufacturing facilities for
aluminosilicate fibers are located in North and South America,
Europe, and Asia. Conversion facilities and end users are
distributed throughout the industrialized world.
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Uses
ASWs have several desirable properties for use as hightemperature
insulating materials, including low thermal
conductivity, low heat storage (low volumetric heat capacity),
thermal shock resistance, lightweight, good corrosion resistance,
and ease of installation. Depending upon the fiber
composition, the maximum end-use temperature for ASWs can
be as high as 1430°C (2600°F). Because of this capability,
these fibers are also included in the class of high-temperature
insulating wools (HTIWs). Benefits of the use of ASW insulation
include reduced energy costs and reduced greenhouse
gas emissions. The energy savings can be substantial when
compared to conventional high-temperature insulation such as
insulating firebrick.
Applications and markets for ASWs are principally industrial
and vary by product form and country including furnace
linings and components in the cement, ceramic, chemical,
fertilizer, forging, foundry, glass, heat treating, nonferrous
metals, petrochemical, power generation (cogeneration), and
steel industries. ASWs are used for passive fire protection
applications where thin, lightweight materials are needed to
prevent flame penetration. ASWs are also used to a minor
degree in emission control applications such as heat shield
insulation, catalytic converter support mat, and filtration media
for air bag inflators. Though sometimes referred to in the
literature as a substitute for asbestos, aluminosilicate fibers are
not typically used in asbestos applications. Aluminosilicate
fibers are priced substantially higher than various types of
asbestos and have maximum end-use temperatures substantially
greater than those for asbestos (which vary depending
upon the product but are typically°850°C).
