Cristobalit

Bezeichnung:Cristobalit

CAS-Nr14464-46-1

Englisch Name:SILICA

CBNumberCB5199387

SummenformelO2Si

Molgewicht60.08

MOL-Datei14464-46-1.mol

Synonyma

Cristobalit

Kristallines Siliciumdioxid, Cristobalit

Kristallines Silicium(IV)-oxid, Cristobalit

Cristobalit physikalisch-chemischer Eigenschaften

Schmelzpunkt

1610 °C(lit.)

Siedepunkt

>100 °C(lit.)

Dichte

2.6 g/mL at 25 °C(lit.)

Brechungsindex

n20/D 1.544(lit.)

storage temp.

2-8°C

Löslichkeit

insoluble in H2O, acid solutions; soluble in HF

Aggregatzustand

tablets (~0.5 g each)

Farbe

colorless hexagonal, hexane crystals, crystalline

crystal system

square

Space group

P42212

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.498	0.498	0.694	90	90	90	0.1721

InChIKey

VYPSYNLAJGMNEJ-UHFFFAOYSA-N

EPA chemische Informationen

Cristobalite (14464-46-1)

Sicherheit

Kennzeichnung gefährlicher	Xn,T
R-Sätze:	48/20
S-Sätze:	22
OEB	D
OEL	TWA: 0.05 mg/m3
WGK Germany	3
RTECS-Nr.	VV7340000
F	3
HS Code	28112290
Toxizität	TCLo inhalation in human: 16mppcf/8H/17

Gefahreninformationscode (GHS)

SILICA Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD
FARBLOSE ODER WEISSE KRISTALLE.
CHEMISCHE GEFAHREN
Reagiert mit starken Oxidationsmitteln unter Feuer- und Explosionsgefahr.
ARBEITSPLATZGRENZWERTE
TLV: 0,05 mg/m?(Alveolengängige Fraktion) (ACGIH 2006).
MAK: Krebserzeugend Kategorie 1; (DFG 2008).
AUFNAHMEWEGE
Aufnahme in den Körper durch Inhalation.
INHALATIONSGEFAHREN
Verdampfung bei 20°C vernachlässigbar; eine gesundheitsschädliche Partikelkonzentration in der Luft kann jedoch beim Dispergieren schnell erreicht werden.
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
Möglich sind Auswirkungen auf die Lunge mit nachfolgender Fibrose (Silikose). Krebserzeugend für den Menschen.
LECKAGE
Verschüttetes Material in Behältern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern. Reste mit viel Wasser wegspülen. Persönliche Schutzausrüstung: Atemschutzgerät, P3-Filter für giftige Partikel.
R-Sätze Betriebsanweisung:
R48/20:Gesundheitsschädlich: Gefahr ernster Gesundheitsschäden bei längerer Exposition durch Einatmen.
S-Sätze Betriebsanweisung:
S22:Staub nicht einatmen.
Chemische Eigenschaften
Silicon dioxide/crystalline silica is a component of many mineral dusts and materials which melts to a glass at very high temperature.
Verwenden
Because of its unique physical and chemical properties, crystalline silica has many uses. Commercially produced silica products include quartzite, tripoli, ganister, chert, and novaculite. Crystalline silica also occurs in nature as agate, amethyst, chalcedony, cristobalite, flint, quartz, tridymite, and, in its most common form, sand (IARC 1997). Naturally occurring silica materials are classified by end use or industry. Sand and gravel are produced almost exclusively for road building and concrete construction, depending on particle size and shape, surface texture, and porosity (IARC 1987).
Definition
A hygroscopic substance such as activated alumina, calcium chloride, silica gel, or zinc chloride. Such substances adsorb water vapor from the air and are used to maintain a dry atmosphere in containers for food packaging, chemical reagents, etc.
Definition
Cristobalite: a mineral form of silicon(IV) oxide, SiO₂.
Allgemeine Beschreibung
Rounded silica sand is the naturally occurring sand usually mined from glacial deposits, sometimes called Ottawa sands. Silica sand is essentially made of quartz (SiO2 ) grains.
Pressure range: 28 < σc < 35 MPa (4 < σc < 5 ksi)
Advantages: Low cost, low density, wide availability, and excellent chemical resistance in acidic media except those containing free HF
Drawbacks: Low permeability, low crushing strength, and poor resistance to flow back
Sicherheitsprofil
Confirmed carcinogen with experimental carcinogenic and tumorigenic data. Poison by intratracheal route. An inhalation hazard. Human systemic effects by inhalation: cough, dyspnea, fibrosis. About twice as toxic as silica in causing sihcosis. See also other sdica entries
mögliche Exposition
Cristobalite is used in the manufacture of water glass, refractories, abrasives, ceramics and enamels. Quartz is used as a mineral, natural or synthetic fiber. Tridymite is used as a filtering and insulating media and as a refractory material for furnace linings. Workers are potentially exposed to crystalline silica in such industries as granite quarrying and cutting, foundry operations; metal, coal, dentistry, painting, and nonmetallic mining; and manufacture of clay and glass products.
Carcinogenicity
Respirable crystalline silica, primarily quartz dusts occurring in industrial and occupational settings, is known to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in humans. Respirable crystalline silica was first listed in the Sixth Annual Report on Carcinogens in 1991 as reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals; the listing was revised to known to be a human carcinogen in the Ninth Report on Carcinogens in 2000.
Inkompatibilitäten
Violent reactions with powerful oxidizers: fluorine, chlorine trifluoride; manganese trioxide; oxygen difluoride, hydrogen peroxide, etc.; acetylene; ammonia.
Waste disposal
Sanitary landfill

SILICA Upstream-Materialien And Downstream Produkte

Cristobalit Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

14464-46-1, SILICA Verwandte Suche:

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