Dimethylcyclosiloxane CAS NO.556-67-2

1. Introduction ofOctamethylcyclotetrasiloxane The Octamethylcyclotetrasiloxane, with its CAS NO556-67-2, is a kind of colorles…

1. Introduction of Octamethylcyclotetrasiloxane

 

The Octamethylcyclotetrasiloxane, with its CAS NO 556-67-2, is a kind of colorless transparent liquid. It has synonyms of Cyclotetrasiloxane,octamethyl- (8CI,9CI);Cyclic dimethylsiloxane tetramer;DWQ 110;DWQ 120;Dabco DC 5258;Dow Corning 244;KF 994;LS 8620;Mirasil CM 4;NSC 345674 and NUCSilicone VS 7207. Octamethylcyclotetrasiloxane should be stored in shady and cool warehouse.

 

2. Properties of Octamethylcyclotetrasiloxane

 

(1) #H bond acceptors: 4    (2) Polar Surface Area: 36.92 ?2
(3) Index of Refraction: 1.423  (4) Molar Refractivity: 79.025 cm3
(5) Molar Volume: 310.077 cm3   (6) Polarizability: 31.328 10-24cm3
(7) Surface Tension: 18.4230003356934 dyne/cm   (8) Density: 0.957 g/cm3
(9) Flash Point: 63.231 °C   (10) Enthalpy of Vaporization: 39.445 kJ/mol
(11) Boiling Point: 174.999 °C at 760 mmHg   (12) Vapour Pressure: 1.57299995422363 mmHg at 25°C
 

3. Structure descriptors of Octamethylcyclotetrasiloxane

 

IUPAC Name: 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane

InChI: 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

Canonical SMILES : C[Si]1(O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)C
 

 

4. Toxicity data of Octamethylcyclotetrasiloxane

 

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Effect	Source
rabbit	LD50	skin	794uL/kg (.794mL/kg)	KIDNEY, URETER, AND BLADDER: HEMATURIA	National Technical Information Service. Vol. OTS0538262
rat	LD50	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