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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Flash point

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Administrative data

flash point of flammable liquids
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Reputable handbook of values for physical - chemical properties. Limited data is provided on methodology. Klimisch 2

Data source

Reference Type:
review article or handbook
Cyano compounds, inorganic
Gail E, Gos S, Kulzer R, Lorösach J, Rubo A, Sauer M.
Bibliographic source:
Ullmannn's Encyclopedia of Industrial Chemistry, Sixth Edition, VCH-Verlag, Weinheim, Germany, pp 159-189

Materials and methods

Test guideline
no guideline required
Principles of method if other than guideline:
This data is obtained from a reputable handbook of values for physical - chemical properties. Methodology was not specified, but it is assumed to be based on methods found in existing guidelines. Current experience with handling this substance indicates that this data is valid.
Type of method:
closed cup
Handbook data; method not well described

Test material

Constituent 1
Chemical structure
Reference substance name:
Hydrogen cyanide
EC Number:
EC Name:
Hydrogen cyanide
Cas Number:
Molecular formula:
hydrogen cyanide

Results and discussion

Flash point
Flash point:
ca. -17.8 °C
Atm. press.:
ca. 1 hPa

Applicant's summary and conclusion

According to Ullmann's Encyclopedia of Industrial Chemistry, the flash point of HCN is -17.8°C (closed cup).
Executive summary:

The flash point of HCN is -17.8°C using a closed cup method.