Ammonium iron bis(sulphate)

Flammability

Link to relevant study record(s)

Reference

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key 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:

Thermogravimetry (TG) was used to investigate ammonium aluminum sulfate dodecahydrate powder and samples of treated and untreated cotton fabric. Measurements were conducted under ambient air. The samples were heated by a TG analyser (TGA V5.1A DuPont 2000) from room temperature up to 600 °C with a heating rate of 10 °C per minute. Additionally, the combustibility of treated and untreated cotton fabrics was tested by a vertical flame spread test method developed by the authors of this paper.

GLP compliance:

not specified

In thermogravimetry measurements ammonium aluminum sulfate dodecahydrate was found to decompose at elevated temperatures (>= ca. 80 °C) by generation of inert or not easily oxidizable gaseous compounds (NH₃, SO₂, N₂, H₂O). In flammability tests of cotton fabrics treated with ammonium aluminum sulfate dodecahydrate solutions this salt acted as flame-retardant.

Interpretation of results:

GHS criteria not met

Conclusions:

Ammonium aluminum sulfate dodecahydrate decomposes at elevated temperatures by generation of inert or not easily oxidizable gases and acts as flame-retardant agent in flammability tests of treated cotton fabrics. Since GHS criteria for flammability are not met, the substance is not classified.

Executive summary:

In this article by Mostashari and Mostashari (published in 2009) thermogravimetry measurements of ammonium aluminum sulfate dodecahydrate, treated and untreated cotton fabrics are described. Ammonium aluminum sulfate dodecahydrate decomposes at high temperatures by generation of not flammable gases. In flammability tests of treated cotton fabrics ammonium sulfate dodecahydrate acts as flame-retardant agent. Since GHS criteria for flammability are not met, the substance is not classified.

Description of key information

In this article by Mostashari and Mostashari (published in 2009) thermogravimetry measurements of ammonium aluminum sulfate dodecahydrate, treated and untreated cotton fabrics are described. Ammonium aluminum sulfate dodecahydrate decomposes at high temperatures by generation of not flammable gases. In flammability tests of treated cotton fabrics ammonium sulfate dodecahydrate acts as flame-retardant agent. Since GHS criteria for flammability are not met, the substance is not classified.

Key value for chemical safety assessment

Flammability:

not classified

Justification for classification or non-classification

In flammability tests of treated cotton fabrics ammonium sulfate dodecahydrate acts as flame-retardant agent. Since GHS criteria for flammability are not met, the substance is not classified.