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CAS Number: 999-97-3
Sum Formula: C6H19NSi2
Molar Mass: 161.4 g/mol
German Synonyms: 1,1,1-Trimethyl-N-(trimethylsilyl)silanamin | Hexamethyldisilazan
English Synonyms: 1,1,1-Trimethyl-N-(trimethylsilyl)silanamine | Hexamethyldisilazane
Structural Formula 1,1,1-Trimethyl-N-(trimethylsilyl)silanamine

Disclaimer: The CLP/GHS classification is not regularly updated in Chemsafe. For up-to-date information, please use the ECHA database. ( https://echa.europa.eu/en/information-on-chemicals )

GHS Hazard and Category:
  • Flam. Liq. 2: flammable liquids, category 2
  • Acute Tox. 4: acute oral toxicity, category 4
  • Acute Tox. 4: acute toxicity by inhalation, category 4
  • Acute Tox. 3: acute dermal toxicity, category 3
  • Skin Corr. 1A: skin corrosion, category 1A
  • Aquatic Chronic 3: long-term hazards hazards to the aquatic environment, category 3
GHS Pictogram:
pictogram flammable
pictogram corrosive
pictogram toxic





GHS Signal Word: Danger
GHS Hazard Statement:
  • H225: Highly flammable liquid and vapour.
  • H302: Harmful if swallowed.
  • H332: Harmful if inhaled.
  • H311: Toxic in contact with skin.
  • H314: Causes severe skin burns and eye damage.
  • H412: Harmful to aquatic life with long lasting effects.

Boiling point
1 2003 Babrauskas, V. 1013.25 hPa 127 °C UTI: 218-1291-20850/0-39
UTI: 218-1291-20850/0-39;
Line no Boiling temperature Pressure
  • defined value
  • at atmospheric pressure
  • property of pure substance
1 127 °C 1013.25 hPa
Bibliographic data
Author Babrauskas, V.
Year 2003
Title Ignition Handbook
Publisher Fire Science Publishers;Issaqah(Pub.)
Abstract English Principles and applications to fire safety engineering, fire investigation, risk management and forensic science
Language ENGL
Density
1 2022 F. Flemming 101 kPa 20 °C 0.77 g/cm3 UTI: 5067-1291-64343/20250516-39
UTI: 5067-1291-64343/20250516-39;
Line no Temperature Pressure Density
  • property of system
  • property of system
  • property of pure substance
1 20 °C 101 kPa 0.77 g/cm3
Bibliographic data
Title Bericht IB-21-5-0272 über die Bestimmung der Sauerstoffgrenzkonzentration von sechs Flüssigproben
Author F. Flemming
Year 2022
Document Number IB-21-5-0272
Institution Ibexu Institut für Sicherheitstechnik GmbH
Publisher IBEXU
Publisher City Freiberg
Language GERM
  • The oxidizing agent is air with an oxygen content of 20.95 % by volume. In the data base it is usually not specified as mixture component. Exceptions are highlighted.
  • Pressure values are absolute, not gauge pressures.
  • Impurities can strongly influence characteristic safety data, particulary if the properties of the impurity considerably deviate from the respective properties of the pure substance.
  • Safety characteristics are only displayed if evaluated data are available.
  • Values can be cited by using the UTI number of the table (Uniform Table Identifier).
  • Color Codes:         recommended value             no recommendation               do not use value

Autoignition Temperature
1 2003 Babrauskas, V. 368 °C UTI: 218-1291-20848/0-39
UTI: 218-1291-20848/0-39;
Line no Autoignition Temperature
  • recommended value
  • methode not internationally standardized
  • property of pure substance
1 368 °C
Bibliographic data
Author Babrauskas, V.
Year 2003
Title Ignition Handbook
Publisher Fire Science Publishers;Issaqah(Pub.)
Abstract English Principles and applications to fire safety engineering, fire investigation, risk management and forensic science
Language ENGL
Flash point
1 2003 Babrauskas, V. 9 °C UTI: 218-1291-20849/0-39
UTI: 218-1291-20849/0-39;
Line no Flash point
  • recommended value
  • closed cup
  • property of pure substance
1 9 °C
Bibliographic data
Author Babrauskas, V.
Year 2003
Title Ignition Handbook
Publisher Fire Science Publishers;Issaqah(Pub.)
Abstract English Principles and applications to fire safety engineering, fire investigation, risk management and forensic science
Language ENGL
Limiting oxygen concentration
1 Limiting Oxygen Concentration in Nitrogen 2022 F. Flemming 97 kPa 150 °C 8 Vol% UTI: 5067-1291-64347/20250516-39
Limiting Oxygen Concentration in Nitrogen
UTI: 5067-1291-64347/20250516-39;
Line no Temperature Pressure Limiting oxygen concentration
  • property of system
  • property of system
  • recommended value
  • experimental
  • at atmospheric pressure
  • EU-standard
  • property of pure substance
1 150 °C 97 kPa 8 Vol% [A] [1]
[A] DIN EN 1839:2017-04: Determination of the explosion limits and the limiting oxygen concentration (LOC) for flammable gases and vapours; German version of EN 1839:2017
[1] tube method
Bibliographic data
Title Bericht IB-21-5-0272 über die Bestimmung der Sauerstoffgrenzkonzentration von sechs Flüssigproben
Author F. Flemming
Year 2022
Document Number IB-21-5-0272
Institution Ibexu Institut für Sicherheitstechnik GmbH
Publisher IBEXU
Publisher City Freiberg
Language GERM
Explosion limits
Lower explosion limit
1 2003 Babrauskas, V. 0.8 Vol% UTI: 218-1291-20846/0-39
UTI: 218-1291-20846/0-39;
Line no Lower explosion limit
  • recommended value
  • property of pure substance
1 0.8 Vol%
Bibliographic data
Author Babrauskas, V.
Year 2003
Title Ignition Handbook
Publisher Fire Science Publishers;Issaqah(Pub.)
Abstract English Principles and applications to fire safety engineering, fire investigation, risk management and forensic science
Language ENGL
Upper explosion limit
1 2003 Babrauskas, V. 31 Vol% UTI: 218-1291-20847/0-39
UTI: 218-1291-20847/0-39;
Line no Upper explosion limit
  • recommended value
  • property of pure substance
1 31 Vol%
Bibliographic data
Author Babrauskas, V.
Year 2003
Title Ignition Handbook
Publisher Fire Science Publishers;Issaqah(Pub.)
Abstract English Principles and applications to fire safety engineering, fire investigation, risk management and forensic science
Language ENGL

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