Dimethylsiloxane, Ethylene Oxide Block Copoly… 27306-78-1

About Dimethylsiloxane, Ethylene Oxide Block Copolymer

Dimethylsiloxane, Ethylene Oxide Block Copolymer is an organosilicon compound carrying the CAS registry number 27306-78-1. Formula C13H34O4Si3, molecular weight 338.66 g/mol. The IUPAC name is 3-(2-methoxyethoxy)propyl-methyl-bis(trimethylsilyloxy)silane. Alternative names: Silwet L 77.

The product is provided as a liquid. Store in a cool, well-ventilated place, away from sources of ignition, with the container tightly sealed. The GHS classification uses the signal word “Warning”, so appropriate gloves, eye protection and ventilation are recommended.

It is commonly used for organic synthesis and API synthesis. It is used across pharmaceutical manufacturing, academic and industrial research and polymers and plastics.

We offer Dimethylsiloxane, Ethylene Oxide Block Copolymer in 10 mL, 25 mL and 100 mL packs with a batch-specific COA, and ship to customers worldwide. SDS and detailed specification sheets can be requested with your quotation.

Typical applications

Organic synthesis
API synthesis

Industries

Specifications & identifiers

Chemical identifiers
Product name	Dimethylsiloxane, Ethylene Oxide Block Copolymer
Catalogue No.	VQ-019754
CAS Number	27306-78-1
IUPAC name	3-(2-methoxyethoxy)propyl-methyl-bis(trimethylsilyloxy)silane
Molecular formula	C₁₃H₃₄O₄Si₃
Molecular weight	338.66 g/mol
Exact mass	338.1765
InChIKey	JQRXTVACLHSVTF-UHFFFAOYSA-N
SMILES	COCCOCCC[Si](C)(O[Si](C)(C)C)O[Si](C)(C)C
PubChem CID	197160

Physical properties
Physical form	Liquid
H-bond donors / acceptors	0 / 4
TPSA	36.9 Å²

Safety & hazard information (GHS)

Harmful / irritant

Environmental hazard

Signal word: Warning

Hazard statements

H302Harmful if swallowed
H312Harmful in contact with skin
H315Causes skin irritation
H319Causes serious eye irritation
H332Harmful if inhaled
H411Toxic to aquatic life with long lasting effects

Precautionary statements: P261, P264, P264 + P265, P270, P271, P273, P280, P301 + P317, P302 + P352, P304 + P340, P305 + P351 + P338, P317, P321, P330, P332 + P317, P337 + P317, P362 + P364, P391, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Dimethylsiloxane, Ethylene Oxide Block Copolymer?

The CAS Registry Number of Dimethylsiloxane, Ethylene Oxide Block Copolymer is 27306-78-1. It is also known as Silwet L 77, Polyethylene glycol monomethyl ether mono[3-[methylbis(trimethylsiloxy)silyl]propyl] ether, 3-(3-(2-Methoxyethoxy)propyl)-1,1,1,3,5,5,5-heptamethyltrisiloxane.

What is the molecular formula and molecular weight of Dimethylsiloxane, Ethylene Oxide Block Copolymer?

Dimethylsiloxane, Ethylene Oxide Block Copolymer has the molecular formula C13H34O4Si3 and a molecular weight of 338.66 g/mol. Its IUPAC name is 3-(2-methoxyethoxy)propyl-methyl-bis(trimethylsilyloxy)silane.

Which grade and pack sizes of Dimethylsiloxane, Ethylene Oxide Block Copolymer can I order?

We supply Dimethylsiloxane, Ethylene Oxide Block Copolymer, in 10 mL, 25 mL, 100 mL packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Dimethylsiloxane, Ethylene Oxide Block Copolymer?

Yes. Every lot of Dimethylsiloxane, Ethylene Oxide Block Copolymer is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Dimethylsiloxane, Ethylene Oxide Block Copolymer be shipped internationally?

Yes. Dimethylsiloxane, Ethylene Oxide Block Copolymer is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.