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Vapour pressure

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Description of key information

A reliable OECD and EC guideline study using the effusion method, the vapour pressure of an analogous substance was determined to be 0.0762 Pa at 20°C. 

Key value for chemical safety assessment

Vapour pressure:
0.076 Pa
at the temperature of:
20 °C

Additional information

Read-across in accordance with Annex XI, Section 1.5 of Regulation (EC) No. 1907/2006 (REACH) is justified on the following basis:

Polyphosphoric acids, ammonium salt (also known as ammonium polyphosphate) is a mixture of oligomeric species of ammonium phosphate. When analysed, the substance appears to consist mainly of ammonium orthophosphates, ammonium diphosphate and ammonium triphosphate. The proportion of the substance that is an ammonium orthophosphate is ≤ 50% and therefore the data presented in the key study is considered to be relevant to the substance to be registered.