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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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
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EC number: 218-465-5 | CAS number: 2157-01-9
- 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
Phototransformation in air
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in air
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
- Principles of method if other than guideline:
- The photodegradation has been estimated using EPI Suite ver. 4.10 (US-EPA, 2008)
- GLP compliance:
- no
- Details on test conditions:
- Sensitiser (for indirect photolysis): OH
- % Degr.:
- 50
- Sampling time:
- 0.4 d
- Test condition:
- OH radicals photolysis
- % Degr.:
- 50
- Sampling time:
- 1.01 d
- Test condition:
- ozone radicals photolysis
- DT50:
- 4.529 h
- Test condition:
- reaction with OH radicals; standard EPA model (AOPwin)
- DT50:
- 24.179 h
- Test condition:
- reaction with atmospheric ozone radicals; standard EPA model (AOPwin)
- Transformation products:
- not specified
- Conclusions:
- Using EPA's standard modelling method, the half-life was determined to be 4.5 h for the reaction with hydroxyl radicals, 24.2 h for the reaction with ozone and 6.6 h combined.
- Executive summary:
Using EPA's standard modelling method, the half-life was determined to be 4.5 h for the reaction with hydroxyl radicals, 24.2 h for the reaction with ozone and 6.6 h combined.
Reference
AOP Program (v1.92) Results:
===========================
SMILES : O=C(OCCCCCCCC)C(=C)C
CHEM : 2-Propenoic acid, 2-methyl-, octyl ester
MOL FOR: C12 H22 O2
MOL WT : 198.31
------------------- SUMMARY (AOP v1.92): HYDROXYL RADICALS (25 deg C) --------
Hydrogen Abstraction = 10.3555 E-12 cm3/molecule-sec
Reaction with N, S and -OH = 0.0000 E-12 cm3/molecule-sec
Addition to Triple Bonds = 0.0000 E-12 cm3/molecule-sec
Addition to Olefinic Bonds = 17.9900 E-12 cm3/molecule-sec
Addition to Aromatic Rings = 0.0000 E-12 cm3/molecule-sec
Addition to Fused Rings = 0.0000 E-12 cm3/molecule-sec
OVERALL OH Rate Constant = 28.3455 E-12 cm3/molecule-sec
HALF-LIFE = 0.377 Days (12-hr day; 1.5E6 OH/cm3)
HALF-LIFE = 4.528 Hrs
------------------- SUMMARY (AOP v1.91): OZONE REACTION (25 deg C) -----------
OVERALL OZONE Rate Constant = 1.137500 E-17 cm3/molecule-sec
HALF-LIFE = 1.007 Days (at 7E11 mol/cm3)
HALF-LIFE = 24.179 Hrs
Experimental Database: NO Structure Matches
Fraction sorbed to airborne particulates (phi):
4.35E-005 (Junge-Pankow, Mackay avg)
7.94E-005 (Koa method)
Note: the sorbed fraction may be resistant to atmospheric oxidation
Half-Lives (hr), (based upon Biowin (Ultimate) and Aopwin):
Air: 6.587
Water: 360
Soil: 720
Sediment: 3240
Biowin estimate: 3.199 (weeks )
Advection Times (hr):
Air: 100
Water: 1000
Sediment: 5e+004
Description of key information
Model calculation using EpiSuite 4.10 (AOP program v1.92, US-EPA, 2008):
Half-life for reaction with hydroxyl radicals ( 1.5E6 OH/cm³) = 4.5 h
Half-life for reaction with ozone (at 7E11 mol/cm³) = 24.2 h
Combined calculation result = 6.6 h
Key value for chemical safety assessment
- Half-life in air:
- 4.5 h
Additional information
n-octyl methacrylate (n-OMA) does not possess UV-absorbing structures. Therefore, direct photolysis is not expected to occur to any significant degree.
While experimental data with model atmospheres exist for MMA which are broadly consistent with model data, no experimental photodegradation data exist for n-OMA. A model calculation using EpiWin v4.10 AOP v1.92 showed a rate constant for the reaction of n-OMA with hydroxyl radicals in the atmosphere of 28.3455 E-12 cm³/molecule*sec. From this rate constant the half-life for the reaction of OH radicals with the test substance is calculated as 4.5 h.
In conclusion, after evaporation or emission to air, n-octyl methacrylate will be rapidly degraded by photochemical processes.
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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