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EC number: 700-761-5 | CAS number: -
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Determination and significance of the water solubility values.
Key value for chemical safety assessment
- Water solubility:
- 2 mg/L
- at the temperature of:
- 22 °C
Additional information
Red SN is a co-precipitate of Basic Red 1 (BR1) and DowFax 2A1 as defined in section 1 of the IUCLID dossier with a ratio of 2 moles of BR1 for 1 mole of Dowfax 2A1.
The molecule Red SN has no specific absorbance and is therefore identified by the absorbance of both the BR1+ and the Dowfax 2A1 -. In normal conditions, there is no dissociation of the molecule Red SN, thus when both concentrations (BR1 and Dowfax) are measured as equivalent, it should correspond to the concentrations of the Red SN.
Several aqueous extractions have been prepared and analyzed thanks to photometry and then an HPLC has been performed to detect the different fractions (isomers, BR1+, Dowfax 2A1-).
All the 3 different assays reached the same conclusion: an excess of BR1+ from 1.9 to 3 mg/L and the possible presence of some Dowfax 2A1 traces.
Those findings imply that the hydrosolubility of Red SN is either not existing or existing but less than 0.1 mg/L. All the assays have been performed on the same batch. No dissociation of the molecule in water is expected. Although the manufacturing process is designed to be under stoichiometric conditions, the BR1+ excess is coming from an excess of BR1 during the manufacturing (and despite the purification steps). Assays on other dyes have shown that the excess of the starting material could be on either the cation or the anion. Therefore an excess of Dowfax cannot be excluded with another batch. This excess would be in the same range of values (1 to 5 mg/L max). Although it has been shown that the solubility of RED SN is less than 0.1 mg/L or not existing, a median value for the Red SN hydrosolubility of 2 mg/L has been used for the ecotoxicity and biodegradation assay, which corresponds to the excess of either the cation or the anion.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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