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Tetramethyl orthosilicate

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Origin: China

Cas No: 681-84-5

Specification: 99%min

Min order Quantity: 1 /kg

Supply Ability: 80 mt/month

Lead time: 7 days for OEM, 3 days for ready goods

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Products Specification
Product Description

Quick Details

CAS No.:: 681-84-5

Other Names:: Methyl silicate

MF:: C4H12O4Si

EINECS No.:: 681-84-5

Place of Origin:: Shandong, China

Type:: Agrochemical Intermediates, Dyestuff Intermediates, Flavor & Fragrance Intermediates, Pharmaceutical Intermediates, Syntheses Material Intermediates

Brand Name:: FinerChem

Model Number:: 681-84-5

Application:: Organic Intermediate

Appearance:: Colorless transparent liquid.

Product Name:: Tetramethyl orthosilicate

CAS:: 681-84-5

Density:: 1.023

Packaging&Delivery

Packaging Details: Fluorinated bottle for 1kg, 25kg/drum,200L Iron drum or as your special request

Port: SHANGHAI, QINGDAO , BEIJING, SHENZHEN , DALIAN

Lead Time:

Quantity(Kilograms)	1 - 500	>500
Est. Time(days)	4	To be negotiated

Products Description

Product Name	Tetramethyl orthosilicate
CAS No.	681-84-5
Appearance	Colorless transparent liquid.
Assay	≥99%
Capacity	1000mt/year
Min.packing	1gram
Application	It is most commonly used as a raw material for sol-gel.
Standard	Export
Brand	Finerchem
More information	Molecular Formula: C4H12O4Si Molecular Weight: 152.22 CAS Registry Number: 681-84-5 EINECS: 211-656-4 Density: 1.023 Melting point: -2 ºC Boiling point: 121-122 ºC Flash point: 26 ºC Water solubility: hydrolysis

Property

CAS No.: 681-84-5 Formula: C4H12O4Si Molecular Weight: 152.22100

Description

Tetramethyl orthosilicate is the chemical compound with the formula Si(OCH3)4. This molecule consists of four methyl groups attached to the hypothetical anion SiO44−. The basic properties are similar to the more popular tetraethyl orthosilicate, which is usually preferred because the product of hydrolysis, ethanol, is less toxic than methanol.
Tetramethyl orthosilicate hydrolyzes to SiO2:
Si(OCH3)4 + 2 H2O → SiO2 + 4 CH3OH
In organic synthesis, Si(OCH3)4 has been used to convert ketones and aldehydes to the corresponding ketals and acetals, respectively.

Basic Info

Chemical Name	Tetramethyl orthosilicate
Synonyms	Silicic acid (H4SiO4), tetramethyl ester; tetramethoxy-silane; tl190; tetramethoxy-silan; methyl orthosilicate; METHYLSILICATE; Tetramethosysilan; tetramethyl silicate; SILICATE,METHYL; O-METHYLSILICATE; TMOS; orthosilicic acid tetramethyl ester; silicon tetramethoxide; Dynasil M;
CAS No.	681-84-5
Molecular Formula	C4H12O4Si
Molecular Weight	152.22100
PSA	36.92000
LogP	0.00760

Properties

Appearance & Physical State	colourless liquid
Density	1.023
Boiling Point	121-122ºC
Melting Point	-2ºC
Flash Point	26ºC
Refractive Index	1.367-1.37
Water Solubility	hydrolysis
Storage Condition	Flammables area
Vapor Density	5.25 (vs air)
Vapor Pressure	3.35 psi ( 20 °C)

Safety Info

RTECS	VV9800000
Hazard Class	6.1
Safety Statements	S16-S26-S28-S36/37/39-S45
HS Code	29209085
WGK Germany	3
Packing Group	I
RIDADR	UN 2606 6.1/PG 1
Risk Statements	R10; R26; R37/38; R41
Hazard Codes	T+
Symbol	GHS02, GHS05, GHS06
Hazard Declaration	H226; H315; H318; H330
Caution Statement	P210; P260; P280; P304 + P340 + P310; P305 + P351 + P338 + P310; P370 + P378
Signal Word	Danger

Synthesis Route

(dimethoxymethyl)trimethoxysilane→Tetramethyl orthosilicate+Trimethoxy(methoxymethyl)silane
Methanol+ethene→Trimethoxysilane+Tetramethyl orthosilicate
Trimethoxysilane+ethene→Tetramethyl orthosilicate+Ethyltrimethoxysilane

Toxicity

Exposure Route	Type of Test	Species Observed	Dose/Duration	Toxic Effects
Oral	LDLo - Lowest published lethal dose	Rodent - rat	700 mg/kg	1.Kidney, Ureter, Bladder-changes in tubules (including acute renal failure, acute tubular necrosis)
Inhalation	LCLo - Lowest published lethal concentration	Rodent - rat	250 ppm/4H	1.Details of toxic effects not reported other than lethal dose value
Intraperitoneal	LD50 - Lethal dose, 50 percent kill	Rodent - rat	100 mg/kg	1.Details of toxic effects not reported other than lethal dose value