ChemicalBook > CAS DataBase List > 2,4,6,8-Tetramethylcyclotetrasiloxane

2,4,6,8-Tetramethylcyclotetrasiloxane

CAS No.2370-88-9
Chemical Name:2,4,6,8-Tetramethylcyclotetrasiloxane
CBNumber:CB1453337
Molecular Formula:C4H16O4Si4
Formula Weight:240.51
MOL File:2370-88-9.mol

2,4,6,8-Tetramethylcyclotetrasiloxane Property

Melting point −69 °C(lit.)
Boiling point 134 °C(lit.)
Density 0.986 g/mL at 25 °C(lit.)
vapor pressure 0.05-479Pa at 20℃
refractive index n20/D 1.387(lit.)
Flash point 76 °F
storage temp. 2-8°C
form liquid
Specific Gravity 0.991
color Colorless to Almost colorless
Viscosity 6.9mm2/s
Water Solubility Miscible with most organic solvents. Immiscible with water.
Sensitive Moisture Sensitive
Hydrolytic Sensitivity 3: reacts with aqueous base
BRN 1787074
InChIKey BQYPERTZJDZBIR-UHFFFAOYSA-N
LogP -2.4-5.54 at 25℃
CAS DataBase Reference 2370-88-9(CAS DataBase Reference)
EPA Substance Registry System Cyclotetrasiloxane, 2,4,6,8-tetramethyl- (2370-88-9)
UNSPSC Code 12352103
NACRES NA.23

Safety

Hazard Codes :Xi
Risk Statements :10-36
Safety Statements :16-26-36
RIDADR :UN 1993 3/PG 3
WGK Germany :3
F :10-21
TSCA :Yes
HazardClass :3
PackingGroup :III
HS Code :29319090

NFPA 704:

	2
2		0

Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal wordWarning
Hazard statements H319-H226
Precautionary statements P280a-P305+P351+P338-P501a-P210-P233-P240-P241+P242+P243-P264-P280-P303+P361+P353-P305+P351+P338+P337+P313-P370+P378-P403+P235-P501

2,4,6,8-Tetramethylcyclotetrasiloxane Price More Price(6)

Brand: Sigma-Aldrich(India)
Product number: 512990
Product name : 2,4,6,8-Tetramethylcyclotetrasiloxane
Purity: ≥98.5%, ≥99.999% trace metals basis
Packaging: 25ML
Price: ₹16237.5
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 760293
Product name : 2,4,6,8-Tetramethylcyclotetrasiloxane
Purity: packaged for use in deposition systems
Packaging: 25ML
Price: ₹70698.08
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: 512990
Product name : 2,4,6,8-Tetramethylcyclotetrasiloxane
Purity: ≥98.5%, ≥99.999% trace metals basis
Packaging: 100ML
Price: ₹33330.18
Updated: 2022/06/14
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Brand: TCI Chemicals (India)
Product number: T2076
Product name : 2,4,6,8-Tetramethylcyclotetrasiloxane
Purity: min. 95.0 %
Packaging: 5G
Price: ₹3500
Updated: 2022/05/26
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Brand: TCI Chemicals (India)
Product number: T2076
Product name : 2,4,6,8-Tetramethylcyclotetrasiloxane
Purity: min. 95.0 %
Packaging: 25G
Price: ₹3900
Updated: 2022/05/26
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2,4,6,8-Tetramethylcyclotetrasiloxane Chemical Properties,Usage,Production

Description 2, 4, 6, 8-TETRAMETHYLCYCLOTETRASILOXANE can be used as the precursor for the deposition of polysiloxane, cyclic siloxane, silicon dioxide, and gate dielectrics in thin-film transistors (TFT) (for example, for the preparation of ultralow dielectric constant pSiCOH film), and is a component of photochemically formed SiOX monolayers on TiO. It is a good impregnant of photoelectric material. It can be used for the manufacturing of modified siloxane with defined hydrogen content and chain quality.
Chemical Properties Colorless or yellowish transparent liquid
Uses 2,4,6,8-Tetramethylcyclotetrasiloxane can occur addition reaction with unsaturated alkenes, so it’s utilized widely to synthesize variety functional reactive silicone fluids which is used to form silicone block copolymer, or used as crosslinker of vinyl addition silicone rubber. Tetramethyl-cyclotetrasiloxane is a good impregnant of photoelectric material. It is used to manufacture of modified siloxane with defined hydrogen content and chain quantity. It is also used in production of silicone polymers and acts as a precursor for the deposition of polysiloxane, cyclic siloxane, silicon dioxide, oxycarbide thin films with low dielectric constant for microelectronics and semiconductors.
Uses 2, 4, 6, 8-Tetramethylcyclotetrasiloxane (TMCTS) is an important precursor for the deposition of polysiloxane, cyclic siloxane, silicon dioxide, oxycarbide thin films with low dielectric constant for microelectronics, semiconductors and other applications
General Description Atomic number of base material: 14 Silicon
Flammability and Explosibility Flammable
Synthesis The synthesis process of 2,4,6,8-Tetramethylcyclotetrasiloxane is as follows. A 1-L four-necked flask equipped with a thermometer, stirrer, column packed with cylindrical glass of about 1x1 mm to a height of 500 mm, water-cooled condenser, outlet tube, and distillate receiver was connected to a vacuum pump. To the flask were fed 100 g of trimethylsiloxy end-capped dimethylpolysiloxane having a viscosity of 10,000 centistokes at 25°C and 1.0 g of the catalyst (i) synthesized above, after which agitation was commenced. While the flask interior was kept under a reduced pressure of 50 mmHg, the flask was heated at 250-260°C using a mantle heater. A fraction distilled out for 14 hours was collected (45 g). The residue (31 g) was a clear liquid. yeild= 52%
Toxics Screening Level The initial threshold screening level (ITSL) for 2,4,6,8-tetramethylcyclotetrasiloxane is 100 μg/m3(annual).
References https://www.alfa.com/zh-cn/catalog/L16642/
http://www.sigmaaldrich.com/catalog/product/aldrich/512990?lang=en&region=US
Grill, A., and V. Patel. "Ultralow dielectric constant pSiCOH films prepared with tetramethylcyclotetrasiloxane as skeleton precursor." Journal of Applied Physics 104.2(2008):107.
Zhang, Jianming, D. S. Wavhal, and E. R. Fisher. "Mechanisms of SiO2 film deposition from tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and trimethylsilane plasmas." Journal of Vacuum Science & Technology A Vacuum Surfaces & Films 22.1(2004):201-213.
Fujino, Katsuhiro, et al. "Low-Temperature Atmospheric-Pressure Chemical Vapor Deposition, Using 2, 4, 6, 8-Tetramethylcyclotetrasiloxane and Ozone." Japanese Journal of Applied Physics 33. 4A (1994):2019-2024.