999-97-3
Product Name:
Hexamethyldisilazane
Formula:
C6H19NSi2
Synonyms:
HMDS;Hexamethyldisilazane;Bis(trimethylsilyl)amine;1,1,1,3,3,3-Hexamethyldisilazane;Bis(trimethylsilyl)amine, HMDS
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Hexamethyl disilazane appears as a liquid. May be toxic by ingestion. Irritates skin and eyes. Vapors are heavier than air. May emit highly toxic nitrogen oxide fumes when heated to decomposition. Used to make other chemicals. |
|---|---|
| Color/Form | Colorless liquid |
| Odor | Ammonia-like odor |
| Boiling Point | 125 °C |
| Flash Point | 48 °F (NFPA, 2010) |
| Solubility | Soluble in acetone, benzene, ethyl ether, heptane, perchloroethylene |
| Density | 0.7741 g/cu cm at 25 °C |
| Vapor Pressure | 13.8 [mmHg] |
| LogP | log Kow = 2.62 /Estimated/ |
| Henry's Law Constant | Henry's Law constant = 8.69X10-5 atm cu-m/mol at 25 °C /Estimated/ |
| Autoignition Temperature | 325 °C at 1013 hPa |
| Viscosity | 0.90 centistokes |
| Refractive Index | Index of refraction = 1.4090 @ 20 °C |
| Dissociation Constants | pKa = 7.55 |
| Kovats Retention Index | 717 |
| Other Experimental Properties | Dielectric constant (1000 Hz) = 2.27 |
| Chemical Classes | Metals -> Metalloid Compounds (Silicon) |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Skull and Crossbones Acute Toxicity GHS06 |
| GHS Hazard Statements |
H225:Flammable liquids H311:Acute toxicity,dermal H412:Hazardous to the aquatic environment, long-term hazard |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. |
COMPUTED DESCRIPTORS
| Molecular Weight | 161.39 g/mol |
|---|---|
| Hydrogen Bond Donor Count | 1 |
| Hydrogen Bond Acceptor Count | 1 |
| Rotatable Bond Count | 2 |
| Exact Mass | 161.10560268 g/mol |
| Monoisotopic Mass | 161.10560268 g/mol |
| Topological Polar Surface Area | 12 Ų |
| Heavy Atom Count | 9 |
| Formal Charge | 0 |
| Complexity | 76.2 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Hexamethyl disilazane appears as a liquid. May be toxic by ingestion. Irritates skin and eyes. Vapors are heavier than air. May emit highly toxic nitrogen oxide fumes when heated to decomposition. Used to make other chemicals.