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Oxides and peroxides

Cyclononasiloxane

CAS 296-43-5Formula H18O9Si9Molar mass 414.91 g/mol
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Cyclononasiloxane chemical structure, H18O9Si9, CAS 296-43-5
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
296-43-5
Formula
H18O9Si9
Molar mass
414.91 g/mol
HS code
281129
Category
Oxides and peroxides

What is Cyclononasiloxane?

Plain description, key identifiers and synonyms

Cyclononasiloxane is a chemical substance with the molecular formula H18O9Si9 and a molar mass of 414.91 g/mol. Its CAS registry number is 296-43-5. The IUPAC name is 1,3,5,7,9,11,13,15,17-nonaoxa-2,4,6,8,10,12,14,16,18-nonasilacyclooctadecane.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,3,5,7,9,11,13,15,17-nonaoxa-2,4,6,8,10,12,14,16,18-nonasilacyclooctadecane
CAS number
296-43-5
Molecular formula
H18O9Si9
InChIKey
YAEMTOBHYXOZAK-UHFFFAOYSA-N
InChI
InChI=1S/H18O9Si9/c1-10-2-12-4-14-6-16-8-18-9-17-7-15-5-13-3-11-1/h10-18H2
SMILES (canonical and isomeric)
O1[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]1

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
414.91 g/molcalc.
Exact mass
413.8874 Dacalc.
LogP (octanol/water)
-8.86calc.
Topological polar surface area
83.07 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
9calc.
Rotatable bonds
0calc.
Heavy atoms
18calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O1[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]1

O1[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]O[SiH2]1

1 ring, 18 atoms. This chemical is the scaffold itself.

1 other chemical share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Cyclononasiloxane suppliers

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Cyclononasiloxane price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Cyclononasiloxane is traded under.

HS 2811.29Indicative HS code

Inorganic oxygen compounds of non-metals, not elsewhere classified in subheading 2811.2

World exports in 2024
$580M
−11.6% vs 2023, imports $596M
2019 to 2024
Top exporters
  1. China21.4%
  2. Germany18.2%
  3. Poland17.5%
Top importers
  1. Germany14.9%
  2. United States13.6%
  3. France * partner reported9.2%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Cyclononasiloxane is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Cyclononasiloxane, based on the data on this page

What is Cyclononasiloxane?

Cyclononasiloxane is a chemical substance with the molecular formula H18O9Si9 and a molar mass of 414.91 g/mol. Its CAS registry number is 296-43-5. The IUPAC name is 1,3,5,7,9,11,13,15,17-nonaoxa-2,4,6,8,10,12,14,16,18-nonasilacyclooctadecane.

What is the CAS number of Cyclononasiloxane?

The CAS registry number of Cyclononasiloxane is 296-43-5.

What is the molecular formula and weight of Cyclononasiloxane?

The molecular formula of Cyclononasiloxane is H18O9Si9 and its molar mass is 414.91 g/mol.

Is Cyclononasiloxane hazardous?

No GHS hazard classification for Cyclononasiloxane is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Cyclononasiloxane?

Cyclononasiloxane is usually classified under HS code 281129 (II. INORGANIC ACIDS AND INORGANIC OXYGEN COMPOUNDS OF NON-METALS, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Cyclononasiloxane?

Post a free request on CompoundList and suppliers of Cyclononasiloxane will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Cyclononasiloxane?

Suppliers quote Cyclononasiloxane on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Cyclononasiloxane

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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