2,5-dihydroxy-3,6-dimethyl-3,6-bis(dihydroxyphosphinyl)-1,4,2,5-dioxadiphosphorane-2,5-dioxide, hexasodium salt

Endpoint summary

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).