Aluminium sulphate

Flash point

Administrative data

Endpoint:

flash point of flammable liquids

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the substance is inorganic

the study does not need to be conducted because the flash point is only relevant to liquids and low melting point solids

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
In accordance with section 2 of REACh Annex XI, flash point measurement does not apply to solids. Please refer to flammable solids under 4.13.
Moreover, in accordance with column 2 of REACH Annex VII, the flash point study does not need to be conducted for inorganics.

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Aluminium sulphate (anhydrous) is a white, odourless, solid.

Octadecahydrate and other hydrated forms are expected to be solid too (from literature and experiment on analogue).

Physical state at 20°C and 1013 hPa:

solid

A reliable literature source is provided for the reference substance (anhydrous form), and is considered as key data.

Supporting information on the common hydrated forms 18 and 14 H2O is extrapolated from literature and from description of an analogue in an experimental report.

Cross-reference 2

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Aluminium sulphate (anhydrous) decomposes at 770°C (literature).

Hydrated forms undergo primary decomposition corresponding to crystal water loss from ca 80°C (from literature and experiment on analogue).

A reliable literature source is provided for the reference substance (anhydrous form), and is considered as key data. The same result was also found in numerous commonly used handbooks or databases, despite not peer reviewed. However the value of 770°C is associated with decomposition, and therefore will not be retained as key value for purpose of CSA (no solid-liquid transition).

A single, updated, reference handbook provides a non-consistent value, but as no details are available, the usual and lower value is retained.

Supporting information on the 18 H2O and on analogue in an experimental report show that the hydrated forms undergo primary decomposition corresponding to crystal water loss from ca 80°C.

Cross-reference 3

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Not a flammable solid (no propagation of combustion if contact with a flame) (from analogue).

Not a self-heating substance (no exothermic reaction) (from analogue).

Not pyrophoric. Not flammable if contact with water. (waived)

Flammability:

not classified

No data is available on the reference substance (anhydrous form), but reliable experimental studies were conducted on analogue, showing no propagation of combustion regarding flammability of solids, and no exothermal reaction, i.e. no self-heating. Despite the test substance was an hydrated grade, the study is considered suitable for purpose, and then retained as key, because heating will vaporise the crystallisation water from 80°C, as shown under 4.2, leaving the parent compound.

Moreover, supporting literature data indicates that the substance is used as a fireproofing agent, therefore as a weight of evidence, it should not have flammable properties.

Based on experience, no flammable properties are anticipated if contact with air or water, therefore studies were deemed unnecessary.

According to Regulation (EC) No.1272/2008 (CLP) criteria, the substance as solid failed to propagate combustion in the preliminary test (UN N1 preliminary test identical to EC A10), therefore it is NOT classified as a flammable solid.

According to Regulation (EC) No.1272/2008 (CLP) criteria, no exothermal reaction was observed in the UN N4 test, therefore the substance is NOT classified as self-heating.