Other name

TMDSO / 1,1,3,3-Tetramethyldisiloxane

CAS Number





Colorless transparent liquid


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XJY-706 1,1,3,3,-Tetramethyldisiloxane is synthetic organic chemistry, soluble in organic solvents such as aromatic hydrocarbons/petroleum hydrocarbons but is insoluble in water. It is a versatile silicone intermediate and is usually used as a silicone end-capping agent. Because the molecular structure contains active hydrogen atoms, copolymer polymers can be synthesized through a hydrosilylation reaction to make a series of active silicone oils with various functional groups.


1,1,3,3-Tetramethyldisiloxane/TMDSO (CAS: 3277-26-7) has been registered (Full substance) under REACH (EC) 1907/2006.




Product Name

1,1,3,3-Tetramethyldisiloxane / TMDSO

Molecular weight




Content (%, ≥)

≥99% or 99.5% or 99.7%

Boiling point

69~71℃ (Easy to volatilize)




1,1,3,3-Tetramethyldisiloxane/TMDSO is a hydrogen-terminated siloxane dimer, which contains a hydride group that provides a reaction site for its chemical properties. Therefore, in combination with thermal or metal catalysts, TMDSO can react with various substances containing vinyl or hydroxyl functional polysiloxanes.

1. the synthesis of polysiloxane containing faculties end groups (such as block silicone oil, etc.).

2. the preparation of high-performance organic silicone surfactants.

3. the production of many products, such as the addition of silicon rubber, silica gel, hydrogen polysiloxane and plastic, resin modifier, dendrite polymer special additives, etc.

1,1,3,3-Tetramethyldisiloxane is a silicone derivative, which is the main reason why it can be used as a monomer to prepare silicone polymers or silicone resins. It can be used as an intermediate to prepare other silicone compounds. TMDSO is also used in the preparation of non-aqueous polymers and laboratory reagents. In organic synthesis, it can be used as an effective reducing agent for platinum-catalyzed reduction of carboxamides to amines and Au / TiO2 catalyzed hydrosilylation of carbonyl compounds (such as reduction of aldehydes or ketones) relative to monohydrosilane. In addition, using indium bromide (InBr3) as a catalyst, TMDSO can also brominate carboxylic acids directly.

4. in Pharmaceutical intermediates.

5. CVD&ALD Precursors.

Atomic layer deposition (ALD) is a chemical self-limiting deposition technique based on the continuous use of gaseous chemical processes. The thin film (as fine as -0.1Å per cycle) is deposited repeatedly as required to achieve a specific thickness. The main characteristics of the film are the conformal and controllable deposition mode. Precursor selection is the key to ALD process, because it needs to find molecules with sufficient reactivity to produce the required film, but can maintain sufficient stability to be handled and safely transported to the reaction chamber. That is, TMDSO can help complete this process.

6. Used as waterproof agent for textiles, paper and leather.




1,1,3,3-Tetramethyldisiloxane (TMDSO) packaging provides 40kg in 60L drums or 130kg in 210L(55gal) drums or ISO Tank.

Hazardous chemicals are only provided with fixed-size packages, and designated packages are not accepted.



Stored in the original unopened containers. Keep away from light, rain, and ventilation below 30℃ in a dry and cool place. UN1993 Hazardous Chemicals.



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