IUPAC NAME: Trimethoxy(2-trimethoxysilylethyl)silane
Molecular Formula: C₈H₂₂O₆Si₂
Molecular Weight: 270.43 g/mol
Melting Point: <0 °C
Density: 1 g/cm³
Flash Point: 66.7 °C
Boiling Point: 206.4 °C at 760 mmHg
Following is the structure of 1,2-Ethylenebis(trimethoxysilane) (CAS No.18406-41-2):

Index of Refraction: 1.41
Molar Refractivity: 67.01 cm³
Molar Volume: 270.2 cm³
Surface Tension: 22.2 dyne/cm 
H-Bond Acceptor: 6
Rotatable Bond Count: 9
Exact Mass: 270.095492
MonoIsotopic Mass: 270.095492
Topological Polar Surface Area: 55.4
Heavy Atom Count: 16 
Canonical SMILES: CO[Si](CC[Si](OC)(OC)OC)(OC)OC
InChI: InChI=1S/C8H22O6Si2/c1-9-15(10-2,11-3)7-8-16(12-4,13-5)14-6/h7-8H2,1-6H3
InChIKey: JCGDCINCKDQXDX-UHFFFAOYSA-N
EINECS: 242-285-6
Product Categories of 1,2-Ethylenebis(trimethoxysilane) (CAS No.18406-41-2): Bridged MonomersSelf Assembly&Contact Printing; Organosilicon; POSS Precursors and Intermediates; Self-Assembly Materials; Silane Coupling Agents/Adhesion Promoters; SilanesSelf Assembly&Contact Printing; Silsesquioxanes: POSS Nanohybrids; Tri-Alkoxy&Greater SilanesOrganometallic Reagents; Trialkoxysilanes

Reported in EPA TSCA Inventory.

Hazard Codes: T+
Risk Statements: 26 
R26:Very toxic by inhalation.
Safety Statements: 23-36/37-45 
S23:Do not breathe vapour. 
S36/37:Wear suitable protective clothing and gloves. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR: UN 3382 6.1/PG 1
WGK Germany: 3
RTECS: JG7873000
TSCA: Yes
A poison by inhalation. A combustible liquid. When heated to decomposition it emits acrid smoke and irritating vapors.

 1,2-Ethylenebis(trimethoxysilane) (CAS No.18406-41-2) is also named as Bis(trimethoxysilyl)ethane ; 1,2-Bis(trimethoxysilyl)ethane ; 1,4-Disilabutane, 1,1,1,4,4,4-hexamethoxy- ; 3,3,6,6-Tetramethoxy-2,7-dioxa-3,6-disilaoctane ; 4-04-00-04265 (Beilstein Handbook Reference) ; BRN 1776976 ; Dow corning X1-6145A ; Hexamethoxydisilylethane .