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Substance Name: Octamethylcyclotetrasiloxane
RN: 556-67-2
UNII: CZ227117JE
InChIKey: HMMGMWAXVFQUOA-UHFFFAOYSA-N

Classification Codes

  • Adjuvants, Immunologic
  • Immunologic Factors
  • Skin / Eye Irritant
  • TSCA Flag T (Subject to the Section 4 Test Rule under TSCA)

Molecular Formula

  • C8-H24-O4-Si4

Molecular Weight

  • 296.6176
 
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Names and Synonyms

Name of Substance

  • Octamethylcyclotetrasiloxane

Synonyms

  • 4-04-00-04125 (Beilstein Handbook Reference)
  • BRN 1787074
  • CCRIS 1327
  • Cyclic dimethylsiloxane tetramer
  • Cyclotetrasiloxane, octamethyl-
  • EC 209-136-7
  • EINECS 209-136-7
  • HSDB 6131
  • KF 994
  • NSC 345674
  • NUC silicone VS 7207
  • Octamethylcyclotetrasiloxane
  • Oktamethylcyklotetrasiloxan
  • Oktamethylcyklotetrasiloxan [Czech]
  • OMCTS
  • SF 1173
  • Silicone SF 1173
  • UC 7207
  • UNII-CZ227117JE
  • Union carbide 7207
  • VS 7207

Systematic Names

  • Cyclotetrasiloxane, 2,2,4,4,6,6,8,8-octamethyl-
  • Cyclotetrasiloxane, octamethyl-
  • Octamethylcyclotetrasiloxane

Superlist Names

  • Cyclotetrasiloxane, octamethyl-
  • Octamethylcyclotetrasiloxane

Registry Numbers

CAS Registry Number

  • 556-67-2

FDA UNII

  • CZ227117JE

Other Registry Numbers

  • 104986-37-0
  • 117563-66-3
  • 1257661-59-8
  • 83874-62-8

System Generated Number

  • 0000556672

Structure Descriptors

InChI

1S/C8H24O4Si4/c1-13(2)9-14(3,4)11-16(7,8)12-15(5,6)10-13/h1-8H3

InChIKey

HMMGMWAXVFQUOA-UHFFFAOYSA-N

Smiles

C[Si]1(O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)C

Toxicity

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
rabbit LD50 skin 794uL/kg (0.794mL/kg) KIDNEY, URETER, AND BLADDER: HEMATURIA National Technical Information Service. Vol. OTS0538262,
rat LC50 inhalation 36gm/m3/4H (36000mg/m3) LUNGS, THORAX, OR RESPIRATION: DYSPNEA

BEHAVIORAL: EXCITEMENT

SKIN AND APPENDAGES (SKIN): HAIR: OTHER
National Technical Information Service. Vol. OTS0557551,
rat LD50 oral 1540mg/kg (1540mg/kg) BEHAVIORAL: TREMOR National Technical Information Service. Vol. OTS0538262,
rat LD50 skin 1770mg/kg (1770mg/kg) BEHAVIORAL: TREMOR

GASTROINTESTINAL: CHANGES IN STRUCTURE OR FUNCTION OF SALIVARY GLANDS

LIVER: OTHER CHANGES
National Technical Information Service. Vol. OTS0538262,

Physical Properties

Physical Property Value Units Temp (deg C) Source
Melting Point 17.5 deg C   EXP
Boiling Point 175.8 deg C   EXP
log P (octanol-water) 5.1 (none)   EXP
Water Solubility 0.005 mg/L 25 EXP
Henry's Law Constant 0.117 atm-m3/mole 25 EXP
Atmospheric OH Rate Constant 1.01E-12 cm3/molecule-sec 24 EXP

Physical property data is provided to ChemIDplus by SRC, Inc.