Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Auto flammability

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
september 1997 - march 1998
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method A.16 (Relative Self-Ignition Temperature for Solids)
Deviations:
yes
Remarks:
slightly different test method
Principles of method if other than guideline:
Instead of a temperature-programmed laboratory oven an electrical heated block out of non-rusting steal according to Grewer is used. The bottom hollow part is filled with small copper pipe areas. Air is blowing out of these coper pipes. The warmed air is ascending through boreholes into the upper part and blows through and around the wire mesh made out of stainless steel (diameter 1.5 cm, height 3 cm, volume 5cm3) where approx. 10 g of the test substance is located.
Fine graphite is used in a second wire mesh cube as a reference substance for temperature control measurement. In each wire mesh cube a thermoelement measures the temperature of the substance, while the data is transferred to a PC.
GLP compliance:
not specified
Key result
Remarks on result:
other: An exothermal reaction was observed at 216 °C where the test substance decomposed. Therefore it is concluded that nitroguanidine decomposes prior to self ignition.

At 45 °C an endorthermal reaction was observed. At 216 °C the test substance decomposed in an exothermal reaction.

Conclusions:
An exothermal reaction is observed at 216 °C where the test substance decomposed.
Executive summary:

The test was conducted according to a similar method as described in guidance A.16.

The test substance was dried before the test. An endothermal reaction was observed at 45 °C.

An exothermal reaction was observed at 216 °C where the test substance decomposed.

Therefore it is concluded that nitroguanidine decomposes prior to self ignition.

Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
The self ignition temperature is investigated by constant heating leading to constant rising temperatures of the testing material until 360 °C. Smaller amounts (0.5 /in case of very explosive substances 0.1 g or less) are filled in test tubes (outside diameter 16mm, length 120mm). A half bowl made of steel filled with a metal mixture (50% Bi, 25%Pb, 12.5% Cd, 12.5% Sn) serves for heating. The test tubes are put 2 cm deep into the metal liquid which is preheated to 100 °C. Temperatures is rised by 20 °C per minute via a propan burner from the bottom side. There are three samples investigated simultaneously. The ignition temperature is defined as the temperature where all three samples ignite, explode or deflagrate. It is noted if the test material vaporizes wihtout a flame or decomposes.
GLP compliance:
not specified
Specific details on test material used for the study:
Test substance supplier Nigu Chemie GmbH
Remarks on result:
other: decomposition without ignition

The test substance decomposes completely between 230-240 °C.

Conclusions:
The test substance decomposes between 230-240 °C.
Executive summary:

The test results and the appropriate methods were published in the same source but not simultaneously. However, within the publications it is explicitly referred to that these methods were developed and the appropriate results are shown in a separate publication.

The study is conducted according to the method described by the German Federal Institute for Material Testing stated in this study. Nitroguanidine decomposes between 230-240 °C therefore no self-ignition temperature can be assigned.

Description of key information

There are two studies available for this endpoint. Both indicate that the substance decomposes prior to self ignition.

Key value for chemical safety assessment

Additional information

The key study was conducted according to a similar method as described in guidance A.16.

The test substance was dried before the test. An endothermal reaction was observed at 45 °C.

An exothermal reaction was observed at 216 °C where the test substance decomposed prior to self ignition.

The supporting study was conducted according to a method developed by the German Federal Institute for Material Testing (BAM). It also concludes that the substance decomposes prior to self ignition. The temperature range for decomposition is between 230-240 °C. The variance (230-240 °C to 216 °C) is very likely explanable due to the more precise measuring technique used nowadays. The variance is not impairing the overall conclusion of the key information.