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EC number: 500-022-5 | CAS number: 9014-85-1 1 - 4.5 moles ethoxylated
- 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
Endpoint summary
Administrative data
Description of key information
not irritating to skin (no classification)
irreversible effects to the eyes (Category 1)
Key value for chemical safety assessment
Skin irritation / corrosion
Link to relevant study records
- Endpoint:
- skin irritation: in vivo
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- REPORTING FORMAT FOR THE ANALOGUE APPROACH
1. HYPOTHESIS FOR THE ANALOGUE APPROACH
This read-across is based on the hypothesis that source and target substances have similar toxicological properties because
- they are manufactured from similar precursors under similar conditions
- they share structural similarities with common functional groups: the substances start with an acetylene group as core structure; geminal hydroxyl groups on the alpha carbon atoms; distal to the geminal hydroxyl groups is an isobutyl group (methyl isopropyl); the target substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (1.3) is further functionalised with ethylene oxide and has an ethoxylation degree of 1.3; the source substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (3.8) has an ethoxylation degree of 3.8
- they have similar physicochemical properties and thus, show a similar toxicokinetic behaviour
- they are expected to undergo similar metabolism: oxidation of the terminal methyl groups to result in alcohol, aldehyde and finally the corresponding acid
Therefore, read-across from the existing toxicity, ecotoxicity, environmental fate and physicochemical studies on the source substances is considered as an appropriate adaptation to the standard information requirements of REACH regulation.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
see “Justification for read-across” attached to IUCLID section 13
3. ANALOGUE APPROACH JUSTIFICATION
see “Justification for read-across” attached to IUCLID section 13
4. DATA MATRIX
see “Justification for read-across” attached to IUCLID section 13 - Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across: supporting information
- Species:
- rabbit
- Type of coverage:
- semiocclusive
- Preparation of test site:
- abraded
- Vehicle:
- unchanged (no vehicle)
- Duration of treatment / exposure:
- 24 hours
- Observation period:
- 72 hours
- Number of animals:
- six
- Irritation parameter:
- erythema score
- Basis:
- animal: 1-6
- Time point:
- 24/48/72 h
- Score:
- < 1
- Max. score:
- 4
- Reversibility:
- fully reversible
- Irritation parameter:
- edema score
- Basis:
- animal: 1-6
- Time point:
- 24/48/72 h
- Score:
- 0
- Max. score:
- 4
- Interpretation of results:
- GHS criteria not met
Reference
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not irritating)
Eye irritation
Link to relevant study records
- Endpoint:
- eye irritation: in vivo
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- REPORTING FORMAT FOR THE ANALOGUE APPROACH
1. HYPOTHESIS FOR THE ANALOGUE APPROACH
This read-across is based on the hypothesis that source and target substances have similar toxicological properties because
- they are manufactured from similar precursors under similar conditions
- they share structural similarities with common functional groups: the substances start with an acetylene group as core structure; geminal hydroxyl groups on the alpha carbon atoms; distal to the geminal hydroxyl groups is an isobutyl group (methyl isopropyl); the target substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (1.3) is further functionalised with ethylene oxide and has an ethoxylation degree of 1.3; the source substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (3.8) has an ethoxylation degree of 3.8
- they have similar physicochemical properties and thus, show a similar toxicokinetic behaviour
- they are expected to undergo similar metabolism: oxidation of the terminal methyl groups to result in alcohol, aldehyde and finally the corresponding acid
Therefore, read-across from the existing toxicity, ecotoxicity, environmental fate and physicochemical studies on the source substances is considered as an appropriate adaptation to the standard information requirements of REACH regulation.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
see “Justification for read-across” attached to IUCLID section 13
3. ANALOGUE APPROACH JUSTIFICATION
see “Justification for read-across” attached to IUCLID section 13
4. DATA MATRIX
see “Justification for read-across” attached to IUCLID section 13 - Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across source
- Number of animals or in vitro replicates:
- 6 rabbits
- Irritation parameter:
- chemosis score
- Basis:
- animal: 1-6
- Time point:
- 24/48/72 h
- Reversibility:
- not fully reversible within: 7 d (=end of observation period)
- Remarks on result:
- other: please refer to "any other information on results"
- Irritation parameter:
- cornea opacity score
- Basis:
- animal: 1-6
- Time point:
- 24/48/72 h
- Score:
- >= 26.7 - <= 30
- Reversibility:
- fully reversible within: 7 d (= end of observation period)
- Remarks on result:
- other: results obtained with source substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated
- Irritation parameter:
- iris score
- Basis:
- animal: 1-6
- Time point:
- 24/48/72 h
- Score:
- 5
- Reversibility:
- not fully reversible within: 7 d (= end of observation period)
- Remarks on result:
- other: results obtained with source substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated
- Irritation parameter:
- conjunctivae score
- Basis:
- animal: 1-6
- Time point:
- 24/48/72 h
- Score:
- >= 14.7 - <= 16
- Reversibility:
- not fully reversible within: 7 d (= end of observation period)
- Remarks on result:
- other: results obtained with source substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated
- Irritation parameter:
- overall irritation score
- Basis:
- animal: 1-6
- Time point:
- 24/48/72 h
- Reversibility:
- not reversible
- Remarks:
- not fully reversible within 7 d or 21 d observation period
- Remarks on result:
- probability of severe irritation
- Remarks:
- based on both source substances, 2,4,7,9-tetramethyldec-5-yne-4,7-diol and 2,4,7,9-tetramethyldec-5-yne-4,7-diol, utilised
- Interpretation of results:
- Category 1 (irreversible effects on the eye) based on GHS criteria
- Executive summary:
Reversibility cannot be finally evaluated, since effects were still present at the last observation time point (7 d).
Reference
Results obtained with source substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated
1 hour | 24 hours | 48 hours | 72 hours | 5 days | 7 days | |||||||||||||
Rabbit Number | Cornea | Iris | Conjunctivae | Cornea | Iris | Conjunctivae | Cornea | Iris | Conjunctivae | Cornea | Iris | Conjunctivae | Cornea | Iris | Conjunctivae | Cornea | Iris | Conjunctivae |
1 | 20 | 5 | 18 | 30 | 5 | 16 | 30 | 5 | 16 | 30 | 5 | 12 | 20 | 0 | 10 | 20 | 0 | 6 |
2 | 20 | 5 | 18 | 30 | 5 | 18 | 30 | 5 | 14 | 30 | 5 | 12 | 30 | 5 | 10 | 30 | 5 | 6 |
3 | 20 | 5 | 18 | 30 | 5 | 18 | 30 | 5 | 16 | 30 | 5 | 14 | 30 | 5 | 12 | 30 | 0 | 10 |
4 | 20 | 5 | 18 | 30 | 5 | 16 | 30 | 5 | 16 | 20 | 5 | 14 | 20 | 5 | 12 | 20 | 0 | 6 |
5 | 20 | 5 | 18 | 30 | 5 | 16 | 30 | 5 | 14 | 30 | 5 | 14 | 30 | 5 | 10 | 20 | 0 | 8 |
6 | 20 | 5 | 18 | 30 | 5 | 18 | 30 | 5 | 16 | 30 | 5 | 14 | 20 | 5 | 12 | 20 | 5 | 10 |
Endpoint conclusion
- Endpoint conclusion:
- adverse effect observed (irreversible damage)
Respiratory irritation
Endpoint conclusion
- Endpoint conclusion:
- no study available
Additional information
Experimental data on the skin and eye irritating potential of 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (1.3) are not available. However, studies were conducted with the structurally related source substances 2,4,7,9-Tetramethyl-5-decyne-4,7-diol and 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (3.8). Since the composition of the target substance lies in between the two source substances (based on strucutral, physicochemical and toxicological aspects), interpolation of the results is considered appropriate. A justification for read-across is attached to iuclid section 13.
Skin irritation
In a primary skin irritation study according to OECD TG 404 0.5 g of the source substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol was applied to 3 New Zealand White rabbits for 4 h under semiocclusive conditions. Animals were observed for 72 h. Slight erythema was noted at the 1 h observation, which was still present in 2/3 animals at the 24 h observation, but fully reversible within 48 h. Edema was absent at all observation intervals. There were no abnormal clinical signs noted during the observation period. In this study, substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol was not irritating to skin.
In a primary skin irritation study according to Hazardous Substances and Articles, Section 1500.41 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (3.8) was applied to 6 albino rabbits for 24 h under semiocclusive conditions to intact and abraded skin. Animals were observed for 72 h, however, no observation was made at 48 h. Slight erythema was noted at the 24 h observation, but was fully reversible within 72 h on intact as well as on abraded skin. Edema was absent at all observation time points. In this study, substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (3.8) was not irritating to skin.
Eye irritation
In an eye irritation study according to EPA OTS 798.4500 0.1 mL of the source substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol was applied to the conjunctival sac of one eye of 9 New Zealand White rabbits. The eyes of 3 animals were rinsed with lukewarm water for one minute, 30 seconds after application. Six eyes remained unwashed. The eyes were examined and scored by the Draize technique at one hour and at 24, 48, and 72 hours postdose. In order to determine reversibility, the eyes were examined again on Days 7, 14, and 21. Sodium fluorescein was used to determine corneal effects following the 24-hour scoring interval.
Unwashed eyes: Corneal opacity, noted in 6/6 eyes, persisted to Day 21 in 3/6 eyes. Iritis, noted in 6/6 eyes, cleared by Day 7. Conjunctival irritation, noted in 6/6 eyes, cleared by Day 14.
Washed eyes: Corneal opacity, noted in 3/3 eyes, cleared by Day 14. Iritis, noted in 3/3 eyes, cleared by Day 7. Conjunctival irritation, noted in 3/3 eyes, cleared by Day 14.
Based on these results, 2,4,7,9-Tetramethyl-5-decyne-4,7-diol caused irreversible damage to the eyes and requires classification as Category 1.
In an eye irritation study according to Hazardous Substances and Articles, Section 1500.42 0.1 mL of the source substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (3.8) was applied to the conjunctival sac of the right eye of 6 albino rabbits. Animals were observed for 7 days. All six animas showed irritating effects to cornea, iris and conjunctivae, which were still present at the last observation time point (7 d). Thus, reversibility cannot be finally evaluated.
Respiratory irritation
No data on the respiratory irritation of 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (1.3) are available.
There are no data gaps for the endpoint irritation/corrosion. No human information is available for this endpoint. However, there is no reason to conclude that these results would not be applicable to humans.
Overall, both source substances were not irritating to skin and severely irritating to the eyes (irreversible effects). Based on structural similarity, this outcome is interpolated to the target substance 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (1.3), which is also considered to be not irritating to skin and to cause irreversible damage to the eyes.
Justification for classification or non-classification
Skin irritation
Based on reliable, adequate and relevant data, 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (1.3) does not need to be classified for skin irritation according to regulation (EC) 1272/2008.
Eye irritation
Based on reliable, adequate and relevant data, 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, ethoxylated (1.3) has to be classified as Category 1, irreversible effects on the eye according to CLP, EU GHS (Regulation (EC) No 1272/2008) and is assigned the hazard statement H318 and the signal word “Danger”.
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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