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

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CHEMICAL AND PHYSICAL PROPERTIES SAFETY INFORMATION COMPUTED DESCRIPTORS PRODUCT INTRODUCTION RELATED SUPPLIERS

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 Å²
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.