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Hexamethyldisilazane Structure

Hexamethyldisilazane

Chemical Properties

Melting point -78 °C
Boiling point 125 °C (lit.)
Density  0.774 g/mL at 25 °C(lit.)
vapor density  4.6 (vs air)
vapor pressure  20 hPa (20 °C)
refractive index  n20/D 1.407(lit.)
Flash point 57.2 °F
storage temp.  Store below +30°C.
solubility  Miscible with acetone, benzene, ethyl ether, heptane and perchloroethylene.
pka 30(at 25℃)
form  Liquid
Specific Gravity 0.774
color  Colorless
Odor Ammonia odour
PH Range 8.5
explosive limit 0.8-25.9%(V)
Evaporation Rate < 1
Viscosity 0.9mm2/s
Water Solubility  REACTS
Sensitive  Moisture Sensitive
Hydrolytic Sensitivity 7: reacts slowly with moisture/water
Merck  14,4689
BRN  635752
InChIKey FFUAGWLWBBFQJT-UHFFFAOYSA-N
LogP 0.23-1.19 at 20-25℃
CAS DataBase Reference 999-97-3(CAS DataBase Reference)
EWG's Food Scores 1
FDA UNII H36C68P1BH
NIST Chemistry Reference Silanamine, 1,1,1-trimethyl-N-(trimethylsilyl)-(999-97-3)
EPA Substance Registry System Hexamethyldisilazane (999-97-3)

Safety

Symbol(GHS)
Signal wordDanger
Hazard statements H225-H302+H332-H311-H412
Precautionary statements P210-P273-P280-P301+P312-P303+P361+P353-P304+P340+P312
Hazard Codes  F,C,Xn
Risk Statements  11-20/21/22-34-52/53
Safety Statements  16-26-36/37/39-45-61
RIDADR  UN 3286 3/PG 2
WGK Germany  2
RTECS  JM9230000
21
Autoignition Temperature 325 °C
Hazard Note  Flammable
TSCA  Yes
HS Code  2931 90 00
HazardClass  3
PackingGroup  II
Hazardous Substances Data 999-97-3(Hazardous Substances Data)
Toxicity LDLO i.p. in mice: 650 mg/kg (Petrarch Systems Inc. Product Information Sheets)
NFPA 704:
3
1 1

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