Tetraethylsilikat

Bezeichnung:Tetraethylsilikat

CAS-Nr78-10-4

Englisch Name:Tetraethyl orthosilicate

CBNumberCB3854369

SummenformelC8H20O4Si

Molgewicht208.33

MOL-Datei78-10-4.mol

Synonyma

Tetraethylorthosilicat

Tetraethylsilikat

Tetraethoxysilan

Tetraethylsilikat physikalisch-chemischer Eigenschaften

Schmelzpunkt	-77 °C
Siedepunkt	168 °C(lit.)
Dichte	0.933 g/mL at 20 °C(lit.)
Dampfdichte	7.2 (vs air)
Dampfdruck	<1 mm Hg ( 20 °C)
Brechungsindex	n20/D 1.382(lit.)
Flammpunkt	116 °F
storage temp.	Store below +30°C.
Löslichkeit	Soluble in ethanol and 2-propanol.
Aggregatzustand	Liquid
Wichte	0.934
Farbe	Colorless
Explosionsgrenze	1.3-23%(V)
Wasserlöslichkeit	Hydrolysis
FreezingPoint	-77℃
Sensitive	Moisture Sensitive
Hydrolytic Sensitivity	7: reacts slowly with moisture/water
Merck	14,3851
BRN	1422225
Dielectric constant	4.1（20℃）
Expositionsgrenzwerte	ACGIH: TWA 10 ppm OSHA: TWA 100 ppm(850 mg/m3) NIOSH: IDLH 700 ppm; TWA 10 ppm(85 mg/m3)
Stabilität	Stable. Flammable. Incompatible with strong oxidizing agents, water, alkalies, mineral acids.
InChIKey	BOTDANWDWHJENH-UHFFFAOYSA-N
CAS Datenbank	78-10-4(CAS DataBase Reference)
NIST chemische Informationen	Silicic acid (H4sio4), tetraethyl ester(78-10-4)
EPA chemische Informationen	Tetraethyl silicate (78-10-4)

Sicherheit

Kennzeichnung gefährlicher	Xn
R-Sätze:	10-20-36/37-36/37/38
S-Sätze:	16-36/37/39-26-24/25
RIDADR	UN 1292 3/PG 3
OEB	A
OEL	TWA: 10 ppm (85 mg/m3)
WGK Germany	1
RTECS-Nr.	VV9450000
Selbstentzündungstemperatur	230 °C
TSCA	Yes
HS Code	2920 90 70
HazardClass	3
PackingGroup	III
Giftige Stoffe Daten	78-10-4(Hazardous Substances Data)
Toxizität	LD50 orally in Rabbit: 6270 mg/kg LD50 dermal Rabbit 5860 mg/kg
IDLA	700 ppm

Gefahreninformationscode (GHS)

Tetraethyl orthosilicate Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD
FARBLOSE FLüSSIGKEIT MIT CHARAKTERISTISCHEM GERUCH.
CHEMISCHE GEFAHREN
Reagiert mit Säuren, Wasser und Oxidationsmitteln.
ARBEITSPLATZGRENZWERTE
TLV: 10 ppm (als TWA); (ACGIH 2005).
MAK: 10 ppm, 86 mg/m? Spitzenbegrenzung: überschreitungsfaktor I(1); Schwangerschaft: Gruppe D (DFG 2006).
AUFNAHMEWEGE
Aufnahme in den Körper durch Inhalation der Dämpfe und durch Verschlucken.
INHALATIONSGEFAHREN
Beim Verdampfen bei 20°C tritt langsam eine gesundheitsschädliche Kontamination der Luft ein.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION:
Die Substanz reizt die Augen, die Haut und die Atemwege. Exposition kann Bewusstseinstrübung verursachen.
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
Die Flüssigkeit entfettet die Haut. Möglich sind Auswirkungen auf die Nieren.
LECKAGE
Belüftung. Zündquellen entfernen. Ausgelaufene Flüssigkeit in abdichtbaren Behältern sammeln. Reste mit Sand oder inertem Absorptionsmittel aufnehmen und an einen sicheren Ort bringen. Anmerkung: Reagiert mit Wasser unter Bildung einer haftfähigen Masse. Persönliche Schutzausrüstung: Vollschutzanzug mit umgebungsluftunabhängigem Atemschutzgerät.
R-Sätze Betriebsanweisung:
R10:Entzündlich.
R20:Gesundheitsschädlich beim Einatmen.
R36/37:Reizt die Augen und die Atmungsorgane.
S-Sätze Betriebsanweisung:
S16:Von Zündquellen fernhalten - Nicht rauchen.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Chemische Eigenschaften
Ethyl silicate is a flammable, colourless liquid with a mild, sweet, alcohol-like odour. Exposure to ethyl silicate can occur through inhalation, ingestion, and eye or skin contact. It is practically insoluble in water, soluble in alcohol, and slightly soluble in benzene.
Verwenden
Tetraethyl Orthosilicate is used in the preparation of antidreflective coatings on silicate glass via silicon dioxide. Crosslinking reagent.
Verwenden
In weatherproofing and hardening stone, arresting decay and disintegration; manufacture of weatherproof and acidproof mortars and cements. In the "lost wax" process for casting of high-melting alloys.
Verwenden
Commonly used as a precursor to prepare xerogel1,2
Vorbereitung Methode
Prepared from absolute alcohol and silicon tetrachloride.
Allgemeine Beschreibung
A clear colorless liquid with a faint odor. Flash point 125°F. Less dense than water. Vapors are heavier than air.
Air & Water Reaktionen
Flammable. Practically insoluble in water. Reacts slowly with water to form silica and ethyl alcohol [Merck].
Reaktivität anzeigen
Tetraethyl orthosilicate reacts exothermically with acids Strong oxidizing acids may cause a reaction that is sufficiently exothermic to ignite the reaction products. May generate with caustic solutions. May generate flammable hydrogen with alkali metals and hydrides.
Hazard
Moderate fire risk. Strong irritant to eyes, nose, throat.
Health Hazard
Exposures to ethyl silicate cause adverse health effects. The symptoms of poisoning include, but are not limited to, irritation of the eye, mucous membrane, respiratory tract, respiratory difficulty, tremor, fatigue, narcosis, nausea, and vomiting. Prolonged periods of skin contact may produce drying, cracking, inflammation, and dermatitis. As observed in laboratory animals, occupational workers exposed to the chemical substance may suffer from liver and kidney damage, CNS depression, and anemia. At concentrations of 3000 ppm, ethyl silicate causes extreme and intolerable irritation of the eyes and mucous membranes; at 1200 ppm, it produces tearing of the eyes; at 700 ppm, it causes mild stinging of the eyes and nose; and at 250 ppm, it produces slight irritation of the eyes and nose.
Brandgefahr
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
Sicherheitsprofil
Poison by intravenous route. Moderately toxic by other routes. A skin,mucous membrane, and severe eye irritant. Narcotic in high concentrations. Flammable liquid when exposed to heat or flame; can react vigorously with oxidzing materials. When heated to decomposition it emits acrid smoke and fumes. See also ESTERS.
mögliche Exposition
Ethyl silicate is used as a binder in production of cases and molds for investment casting of metals. The next largest application is in corrosion-resistant coatings; primarily as a binder for zinc dust paints. Miscellaneous uses include the protection of white-light bulbs; the preparation of soluble silicas; catalyst preparation and regeneration; and as a crosslinker and intermediate in the production of silicones
Versand/Shipping
UN1292 Tetraethyl acetate, Hazard Class: 3; Labels: 3-Flammable liquid.
läuterung methode
Fractionate it through an 80cm Podbielniak type column (p 11) with a heated jacket and partial take-off head. It is slowly decomposed by H2O-and is soluble in EtOH. It is flammable-it irritates the eyes and mucous membranes. [Sumrell & Ham J Am Chem Soc 78 5573 1956, Bradley et al. J Chem Soc 5020 1952, Beilstein 1 IV 1360.]
Inkompatibilitäten
May form explosive mixture with air. Strong oxidizers; strong acids; water.
Waste disposal
Incineration in admixture with a more flammable solvent.
Vorsichtsmaßnahmen
Occupational workers should avoid contact between ethyl silicate and strong oxidizers, water, mineral acids, and alkalis. Workers should use appropriate personal protective clothing and equipment that must be carefully selected, used, and maintained to be effective in preventing skin contact with ethyl silicate. The selection of the appropriate personal protective equipment (PPE) (e.g., gloves, sleeves, encapsulating suits) should be based on the extent of the worker’s potential exposure to ethyl silicate. There are no published reports on the resistance of various materials to permeation by ethyl silicate.

Tetraethyl orthosilicate Upstream-Materialien And Downstream Produkte

Tetraethylsilikat Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

78-10-4, Tetraethyl orthosilicate Verwandte Suche:

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