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


Chemical Name:
H-4;H4R;D4H;HH4R;TMCTS;DK690;SP9144;GPRv53;Tetramethylcyclotetrasiloxane;cyclic tetramethyltetrasiloxane
Molecular Formula:
Molecular Weight:
MDL Number:
MOL File:
MSDS File:
Last updated:2024-12-25 10:18:12

2,4,6,8-Tetramethylcyclotetrasiloxane Properties

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
LogP -2.4-5.54 at 25℃
CAS DataBase Reference 2370-88-9(CAS DataBase Reference)
EPA Substance Registry System


Risk and Safety Statements

Symbol(GHS)  sòng bạc tiền thậtLiên kết đăng nhậpsòng bạc tiền thậtLiên kết đăng nhập
Signal word  Warning
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
Hazard Codes  Xi
Risk Statements  10-36
Safety Statements  16-26-36
RIDADR  UN 1993 3/PG 3
WGK Germany  3
HazardClass  3
PackingGroup  III
HS Code  29319090
NFPA 704
2 0

2,4,6,8-Tetramethylcyclotetrasiloxane price More Price(21)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 512990 2,4,6,8-Tetramethylcyclotetrasiloxane ≥98.5%, ≥99.999% trace metals basis 2370-88-9 25ml $379 2025-03-01 Buy
Sigma-Aldrich 512990 2,4,6,8-Tetramethylcyclotetrasiloxane ≥98.5%, ≥99.999% trace metals basis 2370-88-9 100ml $630 2025-03-01 Buy
TCI Chemical T2076 2,4,6,8-Tetramethylcyclotetrasiloxane >95.0%(GC) 2370-88-9 5g $31 2025-03-01 Buy
TCI Chemical T2076 2,4,6,8-Tetramethylcyclotetrasiloxane >95.0%(GC) 2370-88-9 25g $101 2025-03-01 Buy
Alfa Aesar L16642 2,4,6,8-Tetramethylcyclotetrasiloxane, 99% 2370-88-9 25g $160 2025-03-01 Buy
Product number Packaging Price Buy
512990 25ml $379 Buy
512990 100ml $630 Buy
T2076 5g $31 Buy
T2076 25g $101 Buy
L16642 25g $160 Buy

2,4,6,8-Tetramethylcyclotetrasiloxane Chemical Properties,Uses,Production


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


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.


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



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%


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.

Synthesis of 2,4,6,8-Tetramethylcyclotetrasiloxane from Dichloromethylsilane and Water
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Sirichem (Zhangjiakou) Sci-Tech.Co.,Ltd.
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View Lastest Price from 2,4,6,8-Tetramethylcyclotetrasiloxane manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
sòng bạc tiền thậtLiên kết đăng nhập 2025-03-13 2,4,6,8-Tetramethylcyclotetrasiloxane
US $0.00-0.00 / kg 0.10000000149011612kg 97% 200tons Hubei Changfu Chemical Co., Ltd.
sòng bạc tiền thậtLiên kết đăng nhập 2024-03-21 2,4,6,8-TETRAMETHYLCYCLOTETRASILOXANE
US $0.00-0.00 / kg 1kg 98% 1000kg LY Global chemicals co.,ltd .
sòng bạc tiền thậtLiên kết đăng nhập 2024-03-06 2,4,6,8-TETRAMETHYLCYCLOTETRASILOXANE
US $1.00 / Kg/Drum 1KG 98%min 10mt per month Wuhan KEMI-WORKS Chemical Co., Ltd.

2,4,6,8-Tetramethylcyclotetrasiloxane Spectrum

2,4,6,8-tetramethylcyclotetrasiloxane,mixtureofisomers 2,4,6,8-tetramethyl-1,3,5,7,2λ3,4λ3,6λ3,8λ3-tetraoxatetrasilocane 2,4,6,8-Tetramethylcyclotetrasiloxane(HD4) Cyclotetrasiloxane, 2,4,6,8-tetramethyl- Tetramethylcyclotetrasiloxane 2,4,6,8-TETRAMETHYLCYCLOTETRASILOXANE, 9 9.5+% 1,3,5,7-TETRAMETHYLCYCLOTETRASILOXANE (2% CHLOROSILANE STABILIZED) 1,3,5,7-TETRAMETHYLCYCLOTETRASILOXANE 95+% 2,4,6,8-Tetramethylcyclotetrasiloxane, 95%, mixture of isomers 1,3,5,7-Tetramethyl-2,4,6,8-tetraoxa-1,3,5,7-tetrasilacyclooctane 2,4,6,8-Tetramethylcyclooctanetetrasiloxane 2,4,6,8-Tetramethylcyclooctatetrasiloxane H-4 2,4,6,8-Tetramethylcyclotetrasiloxane,95% 1,3,5,7-Cyclotetra(methylsiloxane) SP9144 Anti-HRH4 (N-terminal) antibody produced in rabbit GPRv53 H4R HH4R 1,3,5,7-TETRAMETHYLCYCLOTETRASILOXANE 99+% (D4H) 1,3,5,7-tetraMethylcyclotetrasiloxane 2,4,6,8-TetraMethylcyclotetrasiloxane 1,3,5,7-TETRAMETHYLCYCLOTETRASILOXANE 2,4,6,8-TETRAMETHYLCYCLOTETRASILOXANE cyclic tetramethyltetrasiloxane 2,4,6,8-Tetramethylcyclotetrasiloxane Liquid TMCTS 1,2,5,7-Tetramethylcyclotetrasiloxane 2,4,6,8-Tetramethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane 2,4,6,8-tetramethyl-cyclotetrasiloxan D4H 1,3,5,7-TETRAMETHYLCYCLOTETRASILOXANE, 99.0% 1,3,5,7-Tetramethyl-cyclotetrasiloxane (DH4) DK690 2370-88-9 C4H16O4Si4 C4H18O4Si4 HSiCH3O4 Organosilicon Organometallic Reagents Siloxanes Siloxanes
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