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Diss Factsheets
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EC number: 220-266-3 | CAS number: 2695-37-6
- 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
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2014/10/03 - 2014/10/16
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
- Reason / purpose for cross-reference:
- reference to other study
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- thermal analysis
- Key result
- Decomposition:
- yes
- Decomp. temp.:
- > 431 - < 436.8 °C
- Conclusions:
- Sodium p-styrenesulfonate neither melt nor decomposed until 300 °C.
- Executive summary:
The thermal behavior of sodium p-styrenesulfonate was investigated with TG-TDA measurement.
Measurement under nitrogen, endothermic absorption observed around 100 °C seemed to be due to water loss and exothermic peak observed around 330 ° C seemed to be due to polymerization of the test substance.
In the air, thermal behavior of the test sample was very complex, After loss of water around 100 °C, the weight of the test sample was decreased very slowly. At the 570 °C, clear exothermal peak, which might be assumed to be due to combusion, was observed.
Reference
Under Air
From R.T. to 100 °C
Sample weight was reduced by 6.4 wt% and endothermic peak was observed at 67 °C. This observation seems to be due to loss of crystal water from the sample.
From 100 °C to 267 °C
Sample weight was increased by 2.7 wt% and exothermic peak was observed at 267 °C. This seems to be due to weight gain by oxidation of the substance.
From 267 °C to 654 °C
Sample weight was reduced by 67 wt% and exothermic peaks were observed at 441 °C, 571 °C and exothermic band was observed between 620 °C and 653 °C.
These weight losses seemed to be due to decomposition and/or combustion of the test substance.
The deformation of the TG and DTA curves were due to tentative temperature increase of test substance.
Under Nitrogen
From R.T to 100 °C
The test sample weight was reduced by 5.3 wt% and endothermic peak was observed at 67 °C
This seemed to be due to elimination of crystal water in the test sample.
Exothermic peaks at 304 and 333 °C.
These peaks were due to phase transformation of the test substance because the change of the test substance weight was not observed.
From 400 °C to 800 °C
The test sample weight was reduced by 35.2 wt% and endothermic peak was observed at 437 °C.
This weight loss seemed to be due to decomposition of the test substance.
NaSS seemed to decompose above 270 °C under air and decompose above 400 °C under nitrogen atmosphere.
Description of key information
The melting point of this substance was measured with TG-DTA method. This substance did not melt but only decomposed at from 431.0 degree Celsius to 436.8 degree Celsius under nitrogen atomosphere.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 436 °C
Additional information
The decomposition temperature was measured by registrant under ISO 9001 with TG-DTA method under nitrogen atomosphere.
The melting point was reported in a literature, but measuring method was not known.
So, the data presented by registrant was adopted as decomposition temperature of Sodium p-vinylbenzenesulphonate.
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