Octadecamethyloctasiloxane - ≥95% , CAS No.556-69-4

CAS: 556-69-4 Cat. No.: O770391 Molecular Weight: 607.30 EC Number: 209-138-8
AVAILABLE TO ORDER
GRADE & PURITY ≥95%
Storage
Store at 2-8°C,Desiccated
Shipped In
Wet ice
 ·  off list, applied to all prices below.
Size
Status
Price
Qty
250mg
O770391-250mg
8-12 wks(?) Production requires sourcing of materials. We appreciate your patience and understanding.
$44.90
1g
O770391-1g
8-12 wks(?) Production requires sourcing of materials. We appreciate your patience and understanding.
$125.90
5g
O770391-5g
8-12 wks(?) Production requires sourcing of materials. We appreciate your patience and understanding.
$439.90
Enter a quantity for the sizes you want to add.
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Why this grade

≥95% for sensitive chromatographic and analytical workflows requiring minimal baseline interference.

🌡

Storage & shipping

Store at 2-8°C,Desiccated Ships Wet ice Check lot-specific COA for exact specifications.

📋

Quality documents

SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.

📚

Literature proof

Cited in 0 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Specifications

Specifications & Purity
≥95%
Storage
Store at 2-8°C, Desiccated
Shipped In
Wet ice
This product requires cold chain shipping. Ground and other economy services are not available.
Purity
≥95%
Names and Identifiers
Canonical SmilesC[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C
InChIKeyVWGDPBQTSZDFMX-UHFFFAOYSA-N
INCHI1S/C18H54O7Si8/c1-26(2,3)19-28(7,8)21-30(11,12)23-32(15,16)25-33(17,18)24-31(13,14)22-29(9,10)20-27(4,5)6/h1-18H3
Isomeric SMILES C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C
Molecular Weight 607.30

Documentation

📋 Safety Data Sheet (SDS)

Comprehensive hazard, handling, storage, and regulatory compliance document.

Download SDS →

✅ Certificate of Analysis (COA)

Lot-specific quality data. Enter your lot number to retrieve the exact COA.

Look up COA →

📊 Datasheet

Quick-reference summary of product specifications and applications.

View datasheet →

🔬 Specification Sheet

Full quality attributes and acceptance criteria for this grade.

View spec sheet →

Advanced Data

Taxonomic Classification

Taxonomy Tree

KingdomOrganic compounds
SuperclassOrganometallic compounds
ClassOrganometalloid compounds
SubclassOrganosilicon compounds
Intermediate Tree Nodes Not available
Direct ParentSiloxanes
Alternative Parents Trialkylheterosilanes  Organic metalloid salts  Organic oxygen compounds  Hydrocarbon derivatives  
Molecular FrameworkAliphatic acyclic compounds
Substituents Siloxane - Trialkylheterosilane - Organoheterosilane - Organic metalloid salt - Organic oxygen compound - Hydrocarbon derivative - Organic salt - Aliphatic acyclic compound
DescriptionThis compound belongs to the class of organic compounds known as siloxanes. These are saturated silicon-oxygen hydrides with unbranched or branched chains of alternating silicon and oxygen atoms (each silicon atom is separated from its nearest silicon neighbours by single oxygen atoms). The general structure of unbranched siloxanes is H3Si[OSiH2]nOSiH3. H3Si[OSiH2]nOSiH[OSiH2OSiH3]2 is an example of a branched siloxane. By extension hydrocarbyl derivatives are commonly included.
External Descriptors Not available
3D Structure
Interactive Chemical Structure Model





Certificates(CoA,COO,BSE/TSE and Analysis Chart)
C of A & Other Certificates(BSE/TSE, COO):
Analytical Chart:

Find and download the COA for your product by matching the lot number on the packaging.

3 results found

Lot NumberCertificate TypeDateItem
E2629388Certificate of AnalysisApr 29, 2026 O770391
E2629390Certificate of AnalysisApr 29, 2026 O770391
E2629416Certificate of AnalysisApr 29, 2026 O770391
Chemical and Physical Properties
Boil Point(°C)310.45°C
Molecular Weight607.300 g/mol
XLogP3
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count7
Rotatable Bond Count14
Exact Mass606.202 Da
Monoisotopic Mass606.202 Da
Topological Polar Surface Area64.599 Ų
Heavy Atom Count33
Formal Charge0
Complexity587.000
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
The total count of all stereochemical bonds0
Covalently-Bonded Unit Count1
Solution Calculators
Reviews

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