• USA Home
  • 8.14750 - Octamethylcyclotetrasiloxane

8.14750 EMD Millipore


Octamethylcyclotetrasiloxane for synthesis. CAS 556-67-2, molar mass 296.62 g/mol., for synthesis

Synonym: Octamethyltetrasiloxane

  • CAS Number 556-67-2

  • Linear Formula C₈H₂₄O₄Si₄

  • Molecular Weight 296.62 g/mol

  •  EC Number 209-136-7



bp   176 °C (1013 hPa)
expl. lim.     0.4 - 11.7 %(V)
vapor pressure   1.3 hPa (20 °C)
solubility   <0.001 g/l Hydrolysis
density   0.95 g/cm3 (25 °C)
flash point   51 °C
autoignition temp.   400 °C
mp   18 °C
viscosity kinematic   1.6 mm2/s (20 °C)
LD 50 oral   LD50 Rat > 2000 mg/kg
LD 50 dermal   LD50 Rat > 2400 mg/kg
storage temp.   Store below +30°C.
specifications   Assay (GC, area%): ≥ 98.0 % (a/a)
  Refractive index (n 25°/D): 1.394 - 1.395
  Due to its specific melting range the product may be solid, liquid, a solidified melt or a supercooled melt.

Price and Availability

Ask us for bulk and customization needs

My Chemicals
Safety & Documentation

Safety Information

HS Code 
2931 90 00
Hazard Statement(s) 
H226: Flammable liquid and vapour.
H361f: Suspected of damaging fertility.
H413: May cause long lasting harmful effects to aquatic life.
Precautionary Statement(s) 
P210: Keep away from heat.
P273: Avoid release to the environment.
P308 + P313: IF exposed or concerned: Get medical advice/ attention.
Storage class 
3 Flammable liquids
WGK 3 highly water endangering
Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.
Hazard Pictogram(s) 
GHS02  GHS02
Hazard Pictogram(s) 
GHS08  GHS08
Hazard Symbols 
Harmful  Harmful
Declaration (railroad and road) ADR, RID 
UN 1993 , 3, II
Declaration (transport by air) IATA-DGR 
UN 1993 , 3, II
Declaration (transport by sea) IMDG-Code 
UN 1993 , 3, II
Categories of danger 
dangerous for the environment, toxic for reproduction
R Phrase 
R 10-53-62
Flammable.May cause long-term adverse effects in the aquatic environment.Possible risk of impaired fertility.
S Phrase 
S 36/37-46-51-61
Wear suitable protective clothing and gloves.If swallowed, seek medical advice immediately and show this container or label.Use only in well-ventilated areas.Avoid release to the environment. Refer to special instructions/ Safety data sheets.
Protocols & Articles
Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?