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Octamethylcyclotetrasiloxane CAS#556-67-2

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Chemical Name：Octamethylcyclotetrasiloxane

CAS No.556-67-2

Molecular Formula：C8H24O4Si4

Molecular weight:296.62

Sample: Available

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Product Details

Products Description of Octamethylcyclotetrasiloxane CAS#556-67-2

Octamethylcyclotetrasiloxane, referred to as D4, is a colorless, transparent or milky white liquid, flammable and odorless. It is a separately defined compound obtained by separation and distillation of the hydrolyzate obtained through the hydrolysis synthesis process with dimethyldichlorosilane as the main raw material, or by separation and distillation of the hydrolyzate after cracking.

Octamethylcyclotetrasiloxane Chemical Properties

Melting point	17-18 °C (lit.)
Boiling point	175-176 °C (lit.)
density	0.956 g/mL at 25 °C (lit.)
vapor density	1 (vs air)
vapor pressure	1.32hPa at 25℃
refractive index	n20/D 1.396(lit.)
Fp	140 °F
storage temp.	Store below +30°C.
solubility	<0.001g/l Hydrolysis
form	liquid
color	colorless
Specific Gravity	0.956
explosive limit	0.4-11.7%(V)
Water Solubility	INSOLUBLE
Sensitive	Moisture Sensitive
Merck	14,6747
BRN	1787074
Dielectric constant	2.4（20℃）
InChIKey	HMMGMWAXVFQUOA-UHFFFAOYSA-N
LogP	6.98 at 21.7℃
CAS DataBase Reference	556-67-2(CAS DataBase Reference)
NIST Chemistry Reference	Cyclotetrasiloxane, octamethyl-(556-67-2)
EPA Substance Registry System	Octamethylcyclotetrasiloxane (556-67-2)

Safety Information

Hazard Codes	Xn
Risk Statements	53-62-10
Safety Statements	36/37-46-51-61
RIDADR	UN 1993 3/PG 3
WGK Germany	1
RTECS	GZ4397000
TSCA	Yes
HazardClass	3
PackingGroup	III
HS Code	29319090
Hazardous Substances Data	556-67-2(Hazardous Substances Data)
Toxicity	LD50 oral in rat: 1540mg/kg

Product Application of Octamethylcyclotetrasiloxane CAS#556-67-2

Octamethylcyclotetrasiloxane is the basic raw material for silicone products such as silicone oil (modified silicone oil), silicone emulsion, silicone rubber, silicone resin, etc. It can also be directly used as a rubber filler treatment agent and cosmetic raw material.

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