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EC number: 226-247-6 | CAS number: 5333-84-6
- 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
Respiratory sensitisation
Administrative data
- Endpoint:
- respiratory sensitisation: in vivo
- Type of information:
- other: Workplace data
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Justification for type of information:
- 1. HYPOTHESIS FOR THE ANALOGUE APPROACH
Structural similarities of the target substance to the source substances include the (bi)cyclic ring structure with a carboxylic acid anhydride group as the single reactive moiety. For the target substance the bicyclic ring structures contains a double bond at a specific location within the ring and also contains a substituted methyl group at a specific location on the ring structure whereas for the source substance neither the position of the double bond nor the methyl group are specified.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
The target substance is a specific isomer of the source substance, tetrahydromethylphthalic anhydride (MTHPA), in which neither the location of the double bond nor the methyl substitution are defined. MTHPA, has a stated composition comprising the target substance 1,2,3,6-tetrahydro-3-methylphthalic anhydride (CAS No. 5333-84-6, EC No. 226-247-6) together with tetrahydro-4-methylphthalic anhydride (CAS No. 34090-76-1, EC No. 251-823-9), 1,2,3,6-tetrahydro-4-methylphthalic anhydride (CAS No. 3425-89-6, CAS No. 222-323-8) and 3-cyclohexene-1,2-dicarboxylic anhydride, 4-methyl- (CAS No. 19438-64-3).
3. ANALOGUE APPROACH JUSTIFICATION
Generally, the physical and chemical properties do not show major differences. All the above mentioned cyclic anhydrides have comparable boiling temperatures, low vapour pressure and, from a physiological point of view, similar partition coefficients. Differences in melting point may be explained by the fact that the substances are representing multi-constituent or mono-constituent substances.
The cyclic anhydrides rapidly hydrolyse in contact with water and the methyl substituted cyclic anhydrides appear to show a low potential for biodegradation. Based on their physico-chemical properties the substances are expected to have low bioaccumulation potentials and comparable adsorption/desorption properties. The dicarboxylic acid degradation product arising from hydrolysis is the moiety of concern with respect to effects in the aquatic environment. The substances have a rather a low potential to cause toxicity to water based species including fish, daphnia, algae and microorganisms.
Acute toxicity is low. All of the substances are expected to be highly irritant to the eye and be both skin and respiratory sensitisers and a harmonised classification is in place for these properties (Index No. 607-240-000). The absence of a mutagenic potential has been demonstrated in various guideline in-vitro tests. The outcome of the available mammalian studies conducted by the oral route suggest local effects (irritation of the stomach mucosa) probably arising from pH effects of the di-acid degradation product to be significant.
Due to structural similarities, comparable physical/chemical properties such as the molecular weight, partition coefficient and vapour pressure, the toxicokinetic profile of the registered substance and the potential structural analogue substances are also expected to be comparable in terms of physiological absorption, distribution, metabolism and excretion processes. The carboxylic acid anhydride group which rapidly hydrolyses to form the di-acid once in contact with physiological liquid, mainly determine the fate of the substance within the body. Available toxicokinetic data demonstrate that cyclic anhydrides are commonly metabolised to the corresponding di-carboxylic acids within the body and are finally excreted in urine.
Data source
Referenceopen allclose all
- Reference Type:
- review article or handbook
- Title:
- List of MAK and BAT values 2000, Maximum concentrations and Biological Tolerance Values at the Workplace
- Author:
- Commission for the investigation of health hazards of chemical compounds in the work area
- Year:
- 2 000
- Bibliographic source:
- published by Willey-Vch, Deutsche Forschungsgemeinschaft
- Reference Type:
- review article or handbook
- Title:
- Guide to occupational exposure values 2002
- Author:
- ACGIH
- Year:
- 2 002
- Bibliographic source:
- ed by ACGIH ISBN: 1-882417-47-X
Materials and methods
Test guideline
- Qualifier:
- no guideline available
- Principles of method if other than guideline:
- not applicable
- GLP compliance:
- no
Test material
- Reference substance name:
- Tetrahydromethylphthalic anhydride
- EC Number:
- 234-290-7
- EC Name:
- Tetrahydromethylphthalic anhydride
- Cas Number:
- 11070-44-3
- IUPAC Name:
- 3a-methyl-3a,4,5,6-tetrahydro-2-benzofuran-1,3-dione
- Reference substance name:
- Methyltetrahydrophthalic anhydride
- IUPAC Name:
- Methyltetrahydrophthalic anhydride
- Details on test material:
- no details given
- Molecular formula (if other than submission substance): C9 H10 O3
- Molecular weight (if other than submission substance): 166.18
- Smiles notation (if other than submission substance): O=C(OC(=O)C1CC=C(C2)C)C12
- InChl (if other than submission substance): 1/C9H10O3/c1-5-2-3-6-7(4-5)9(11)12-8(6)10/h2,6-7H,3-4H2,1H3
- Structural formula attached as image file (if other than submission substance): see Fig. (11070-44-3 structure.jpg)
Constituent 1
Constituent 2
Test animals
- Species:
- human
- Strain:
- not specified
- Sex:
- not specified
- Details on test animals or test system and environmental conditions:
- no details given
Test system
- Route of induction exposure:
- inhalation
- Route of challenge exposure:
- inhalation
- Vehicle:
- not specified
- Concentration:
- no details given
- No. of animals per dose:
- no details given
- Details on study design:
- no details given
- Challenge controls:
- no details given
Results and discussion
- Results:
- MTHPA was classified as "Sa", danger of sensitization of airways by the German MAK commission (Commission for the investigation of health hazards of chemical compounds in the work area).
Substances classified as "Sa" can cause symptoms of the airways and also of the conjunctiva (substances causing airway sensitization). - Positive control results:
- no details given
- Negative control results:
- no details given
Any other information on results incl. tables
no details given
Applicant's summary and conclusion
- Interpretation of results:
- sensitising
- Conclusions:
- Tetrahydromethylphthalic anhydride (MTHPA) classified as sensitising to the respiratory tract.
- Executive summary:
Tetrahydromethylphthalic anhydride (MTHPA) was classified as "Sa", danger of sensitization of airways by the German MAK commission (Commission for the investigation of health hazards of chemical compounds in the work area). Substances classified as "Sa" can cause symptoms of the airways and also of the conjunctiva (substances causing airway sensitization).
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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