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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

Administrative data

Description of key information

Additional information

The physico-chemical properties of 2,5-dihydroxy-3,6-dimethyl-3,6-bis(dihydroxyphosphinyl)-1,4,2,5-dioxadiphosphorane-2,5-dioxide, hexasodium salt (ADPA dimer Na salt) were determined experimentally on the parent substance as manufactured, i.e. with ca 35% moisture (unless otherwise specified), or estimated from QSARs. Endpoints not relevant were waived.

The substance is a dense solid at ambient temperature, with negligible volatility anticipated. It is very soluble in water, with no surface-active properties. It has low potential for bioaccumulation based on its estimated Log Kow value of -0.61.

It is not classified as dangerous with regard to physical hazards, according to CLP criteria. However, incompatible substances may lead to release of dangerous decomposition products

Summary of relevant physico-chemical properties:

Endpoint

Data

Appearance

Coarse, compactable white powder.

Melting point

> 375°C

Boiling point

Vaporisation of moisture at 106-125°C, followed by decomposition above 175°C (under nitrogen atmosphere).

Relative density

D20/4 = 1.86 (dried substance)

 Vapour pressure  Expected negligible, based in high mp.
Partition coefficient  -0.61 (calculated value) Low bioaccumulation potential
 Water solubility  40.5 g/L at 20°C (pH 10.5 -10.7)
 Surface tension  72.9 mN/m at 1 g/L
 Flammability  No propagation in contact with a flame. No flammable properties expected if contact with air or water (based on chemical structure and experience). No self-ignition anticipated (no exothermic reaction observed up to 400°C).

Explosive properties

 Low potential for explosive properties (based on chemical structure and absence of exothermal reaction up to 300°C).

Oxidising properties

 Mixtures of substance with cellulose did not ignite.
 Self-reactive properties  No exothermic decomposition effects were observed up to 300°C. Considered SADT >75°C. No further testing required.
 Self-heating properties  Low potential as components not containing metals, and wet powder with ca 35% moisture.
 Corrosion to metals Not corrosive to steel or aluminium.
 Other hazards  Contact with strong reducing or oxidising agents may release flammable and toxic products (phosphine, phosphorus oxides).