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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.
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EC number: 241-602-5 | CAS number: 17625-03-5
- 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
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_toxicological-information.png)
Toxicological Summary
- Administrative data
- Workers - Hazard via inhalation route
- Workers - Hazard via dermal route
- Workers - Hazard for the eyes
- Additional information - workers
- General Population - Hazard via inhalation route
- General Population - Hazard via dermal route
- General Population - Hazard via oral route
- General Population - Hazard for the eyes
- Additional information - General Population
Administrative data
Workers - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 5.88 mg/m³
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 150
- Dose descriptor starting point:
- NOAEL
- Value:
- 1 000 mg/kg bw/day
- Modified dose descriptor starting point:
- NOAEC
- Value:
- 881.6 mg/m³
- Explanation for the modification of the dose descriptor starting point:
Dose descriptor starting point (oral rat NOAEL = 1000 mg/kg bw) has been determined as a result of an oral test performed according to OECD 422 Guideline. In this test negative results have been obtained (i.e. NOAEL has been set equal to maximum dose of 1000 mg/kg bw); however, according to ECHA Guidance R.8, a negative result in OECD 422 test may lower the concerns for reproductive toxicity, but can not provide reassurance of the absence of this hazardous property.
According to ECHA Guidance Chapter R.8: Characterisation of dose [concentration]-response for human health, negative result in a OECD 422 test can provide the basis for deriving a DNELfertility and/or DNELdevelopment from the highest dose level tested and by application of an additional assessment factor of 2 to 5, decided on a case-by-case basis, that should account for the limitations of the study.
No adequate experimental effect data are available on the inhalation route of exposure for workers; therefore, route-to-route extrapolation has been performed for systemic effects. It is not possible to quantify differences in metabolism, excretion and distribution, so only differences between the different routes as determined by the percentages of absorption into the systemic circulation has been considered.
Default absorption values have been used for the different routes of exposure; therefore, for both the starting route and the end route (the route to which the extrapolation is being made), worst case assumptions have been applied. Worst case, in this context, has been obtained assuming a limited absorption for the starting route, leading to a low (conservative) internal NOAEL. To secure a conservative external NOAEL a maximum absorption has been assumed for the end route, leading to a low external NOAEL.
This approach is proposed by ECHA Guidance Chapter R.8: Characterisation of dose [concentration]-response for human health in the absence of route-specific information on the starting route, to include a default factor of 2 (i.e. the absorption percentage for the starting route is half that of the end route) in the case of oral-to inhalation extrapolation. The inclusion of this factor 2 means for example that 50% (instead of 100%) absorption is assumed for oral absorption, and 100% for inhalation.
Modification of the starting point
Conversion of the oral rat NOAEL into a corrected inhalatory NOAEC to assess human inhalatory exposure for workers (in case of 8h exposure/d).
corrected inhalatory NOAEC = oral NOAEL x 1/sRVrat x ABSoral-rat/ABSinh-human x sRVhuman/wRV
corrected inhalatory NOAEC = 1000 mg/kg bw x 1/0.38 m3/kg bw x 50/100 x 6.7 m3 (8h)/ 10 m3 (8h) = 881.6 mg/m3
- AF for dose response relationship:
- 1
- Justification:
- The starting point for the DNEL calculation is a NOAEL.
- AF for differences in duration of exposure:
- 6
- Justification:
- The dose descriptor starting point has been determined in OECD 422 test. The combined repeated dose toxicity study with the reproduction/developmental toxicity screening test (OECD TG 422) is a combination of a sub-acute toxicity study and the screening study for reproductive/developmental toxicity; therefore, the extrapolation applied is from subacute to chronic.
- AF for interspecies differences (allometric scaling):
- 1
- Justification:
- Allometric scaling factor has been set to 1.
According to ECHA Guidance Chapter R.8: Characterisation of dose [concentration]-response for human health (version 2.1, 2010 - p. 62) interspecies differences factor for allometric scaling have not to be applied when starting point has been converted from oral NOAEL rat into inhalatory NOAEC rat (Example B.3, p. 62), since the value has been calculated using a default respiratory volume for the rat corresponding to the daily duration of human exposure, followed by a correction for differences in absorption between routes, and a correction for differences in ihalation absorption between rats and humans. Moreover, for workers an additional correction has been applied for the difference between respiratory rates under standard conditions and under conditions of light activity. - AF for other interspecies differences:
- 2.5
- Justification:
- An additional factor of 2.5 for other interspecies differences has been applied.
- AF for intraspecies differences:
- 5
- Justification:
- For workers, as standard procedure for threshold effects a default assessment factor of 5 is to be used, based on the fact that this sub population does not cover the very young, the very old, and the very ill.
- AF for the quality of the whole database:
- 2
- Justification:
- A negative result in OECD 421/422 test may lower the concerns for reproductive toxicity, but can not provide reassurance of the absence of this hazardous property. However, it can provide the basis for deriving a DNELfertility and/or DNELdevelopment from the highest dose level tested and by application of an additional assessment factor of 2 to 5, decided on a case-by-case basis that should account for the limitations of this study.
- AF for remaining uncertainties:
- 1
- Justification:
- No others uncertainties identified.
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Workers - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 1.67 mg/kg bw/day
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 600
- Dose descriptor starting point:
- NOAEL
- Value:
- 1 000 mg/kg bw/day
- Modified dose descriptor starting point:
- NOAEL
- Value:
- 1 000 mg/kg bw/day
- Explanation for the modification of the dose descriptor starting point:
Dose descriptor starting point (oral rat NOAEL = 1000 mg/kg bw) has been determined as a result of an oral test performed according to OECD 422 Guideline. In this test negative results have been obtained (i.e. NOAEL has been set equal to maximum dose of 1000 mg/kg bw); however, according to ECHA Guidance R.8, a negative result in OECD 422 test may lower the concerns for reproductive toxicity, but can not provide reassurance of the absence of this hazardous property.
According to ECHA Guidance Chapter R.8: Characterisation of dose [concentration]-response for human health, negative result in a OECD 422 test can provide the basis for deriving a DNELfertility and/or DNELdevelopment from the highest dose level tested and by application of an additional assessment factor of 2 to 5, decided on a case-by-case basis, that should account for the limitations of the study.
No adequate experimental effect data are available on the dermal route of exposure for workers; therefore, route-to-route extrapolation has been performed for systemic effects. It is not possible to quantify differences in metabolism, excretion and distribution, so only differences between the different routes as determined by the percentages of absorption into the systemic circulation has been considered.
Modification of the starting point
Conversion of the oral rat NOAEL into dermal NOAEL rat (in mg/kg bw day) by correcting for differences in absorption between routes as well as for differences in dermal absorption between rats and humans.
corrected dermal NOAEL = oral NOAEL x ABSoral-rat/ABSderm-human
On the assumption that, in general, dermal absorption will not be higher than oral absorption, no default factor (i.e. factor 1) has been introduced for oral-to-dermal extrapolation.
- AF for dose response relationship:
- 1
- Justification:
- The starting point for the DNEL calculation is a NOAEL.
- AF for differences in duration of exposure:
- 6
- Justification:
- The dose descriptor starting point has been determined in OECD 422 test. The combined repeated dose toxicity study with the reproduction/developmental toxicity screening test (OECD TG 422) is a combination of a sub-acute toxicity study and the screening study for reproductive/developmental toxicity; therefore, the extrapolation applied is from subacute to chronic.
- AF for interspecies differences (allometric scaling):
- 4
- Justification:
- Allometric scaling factor for rat is 4.
- AF for other interspecies differences:
- 2.5
- Justification:
- An additional factor of 2.5 for other interspecies differences has been applied; therefore, the overall value is 10.
- AF for intraspecies differences:
- 5
- Justification:
- For workers, as standard procedure for threshold effects a default assessment factor of 5 is to be used, based on the fact that this sub population does not cover the very young, the very old, and the very ill.
- AF for the quality of the whole database:
- 2
- Justification:
- A negative result in OECD 421/422 test may lower the concerns for reproductive toxicity, but can not provide reassurance of the absence of this hazardous property. However, it can provide the basis for deriving a DNELfertility and/or DNELdevelopment from the highest dose level tested and by application of an additional assessment factor of 2 to 5, decided on a case-by-case basis that should account for the limitations of this study.
- AF for remaining uncertainties:
- 1
- Justification:
- No others uncertainties identified.
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
Workers - Hazard for the eyes
Local effects
- Hazard assessment conclusion:
- high hazard (no threshold derived)
Additional information - workers
General Population - Hazard via inhalation route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 1.45 mg/m³
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 300
- Dose descriptor starting point:
- NOAEL
- Value:
- 1 000 mg/kg bw/day
- Modified dose descriptor starting point:
- NOAEC
- Value:
- 435 mg/m³
- Explanation for the modification of the dose descriptor starting point:
Dose descriptor starting point (oral rat NOAEL = 1000 mg/kg bw) has been determined as a result of an oral test performed according to OECD 422 Guideline. In this test negative results have been obtained (i.e. NOAEL has been set equal to maximum dose of 1000 mg/kg bw); however, according to ECHA Guidance R.8, a negative result in OECD 422 test may lower the concerns for reproductive toxicity, but can not provide reassurance of the absence of this hazardous property.
According to ECHA Guidance Chapter R.8: Characterisation of dose [concentration]-response for human health, negative result in a OECD 422 test can provide the basis for deriving a DNELfertility and/or DNELdevelopment from the highest dose level tested and by application of an additional assessment factor of 2 to 5, decided on a case-by-case basis, that should account for the limitations of the study.
No adequate experimental effect data are available on the inhalation route of exposure for workers; therefore, route-to-route extrapolation has been performed for systemic effects. It is not possible to quantify differences in metabolism, excretion and distribution, so only differences between the different routes as determined by the percentages of absorption into the systemic circulation has been considered.
Default absorption values have been used for the different routes of exposure; therefore, for both the starting route and the end route (the route to which the extrapolation is being made), worst case assumptions have been applied. Worst case, in this context, has been obtained assuming a limited absorption for the starting route, leading to a low (conservative) internal NOAEL. To secure a conservative external NOAEL a maximum absorption has been assumed for the end route, leading to a low external NOAEL.
This approach is proposed by ECHA Guidance Chapter R.8: Characterisation of dose [concentration]-response for human health in the absence of route-specific information on the starting route, to include a default factor of 2 (i.e. the absorption percentage for the starting route is half that of the end route) in the case of oral-to inhalation extrapolation. The inclusion of this factor 2 means for example that 50% (instead of 100%) absorption is assumed for oral absorption, and 100% for inhalation.
Modification of the starting point
corrected inhalatory NOAEC = oral NOAEL x 1/sRVrat x ABSoral-rat/ABSinh-human
corrected inhalatory NOAEC = 1000 mg/kg bw x 0.87 m3/kg bw x 50/100 = 435 mg/m3
- AF for dose response relationship:
- 1
- Justification:
- The starting point for the DNEL calculation is a NOAEL.
- AF for differences in duration of exposure:
- 6
- Justification:
- The dose descriptor starting point has been determined in OECD 422 test. The combined repeated dose toxicity study with the reproduction/developmental toxicity screening test (OECD TG 422) is a combination of a sub-acute toxicity study and the screening study for reproductive/developmental toxicity; therefore, the extrapolation applied is from subacute to chronic.
- AF for interspecies differences (allometric scaling):
- 1
- Justification:
- Allometric scaling factor has been set to 1.
According to ECHA Guidance Chapter R.8: Characterisation of dose [concentration]-response for human health (version 2.1, 2010 - p. 62) interspecies differences factor for allometric scaling have not to be applied when starting point has been converted from oral NOAEL rat into inhalatory NOAEC rat (Example B.3, p. 62), since the value has been calculated using a default respiratory volume for the rat corresponding to the daily duration of human exposure, followed by a correction for differences in absorption between routes, and a correction for differences in inhalation absorption between rats and humans. - AF for other interspecies differences:
- 2.5
- Justification:
- An additional factor of 2.5 for other interspecies differences has been applied.
- AF for intraspecies differences:
- 10
- Justification:
- Default value for general population
- AF for the quality of the whole database:
- 2
- Justification:
- A negative result in OECD 421/422 test may lower the concerns for reproductive toxicity, but can not provide reassurance of the absence of this hazardous property. However, it can provide the basis for deriving a DNELfertility and/or DNELdevelopment from the highest dose level tested and by application of an additional assessment factor of 2 to 5, decided on a case-by-case basis that should account for the limitations of this study.
- AF for remaining uncertainties:
- 1
- Justification:
- No others uncertainties identified.
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
General Population - Hazard via dermal route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 0.833 mg/kg bw/day
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 1 200
- Dose descriptor starting point:
- NOAEL
- Value:
- 1 000 mg/kg bw/day
- Modified dose descriptor starting point:
- NOAEL
- Value:
- 1 000 mg/kg bw/day
- Explanation for the modification of the dose descriptor starting point:
Dose descriptor starting point (oral rat NOAEL = 1000 mg/kg bw) has been determined as a result of an oral test performed according to OECD 422 Guideline. In this test negative results have been obtained (i.e. NOAEL has been set equal to maximum dose of 1000 mg/kg bw); however, according to ECHA Guidance R.8, a negative result in OECD 422 test may lower the concerns for reproductive toxicity, but can not provide reassurance of the absence of this hazardous property.
According to ECHA Guidance Chapter R.8: Characterisation of dose [concentration]-response for human health, negative result in a OECD 422 test can provide the basis for deriving a DNELfertility and/or DNELdevelopment from the highest dose level tested and by application of an additional assessment factor of 2 to 5, decided on a case-by-case basis, that should account for the limitations of the study.
No adequate experimental effect data are available on the dermal route of exposure for workers; therefore, route-to-route extrapolation has been performed for systemic effects. It is not possible to quantify differences in metabolism, excretion and distribution, so only differences between the different routes as determined by the percentages of absorption into the systemic circulation has been considered.
Modification of the starting point
Conversion of the oral rat NOAEL into dermal NOAEL rat (in mg/kg bw day) by correcting for differences in absorption between routes as well as for differences in dermal absorption between rats and humans.
corrected dermal NOAEL = oral NOAEL x ABSoral-rat/ABSderm-human
On the assumption that, in general, dermal absorption will not be higher than oral absorption, no default factor (i.e. factor 1) has been introduced for oral-to-dermal extrapolation.
- AF for dose response relationship:
- 1
- Justification:
- The starting point for the DNEL calculation is a NOAEL.
- AF for differences in duration of exposure:
- 6
- Justification:
- The dose descriptor starting point has been determined in OECD 422 test. The combined repeated dose toxicity study with the reproduction/developmental toxicity screening test (OECD TG 422) is a combination of a sub-acute toxicity study and the screening study for reproductive/developmental toxicity; therefore, the extrapolation applied is from subacute to chronic.
- AF for interspecies differences (allometric scaling):
- 4
- Justification:
- Allometric scaling factor for rat is 4.
- AF for other interspecies differences:
- 2.5
- Justification:
- An additional factor of 2.5 for other interspecies differences has been applied; therefore, the overall value is 10.
- AF for intraspecies differences:
- 10
- Justification:
- Default value for general population.
- AF for the quality of the whole database:
- 2
- Justification:
- A negative result in OECD 421/422 test may lower the concerns for reproductive toxicity, but can not provide reassurance of the absence of this hazardous property. However, it can provide the basis for deriving a DNELfertility and/or DNELdevelopment from the highest dose level tested and by application of an additional assessment factor of 2 to 5, decided on a case-by-case basis that should account for the limitations of this study.
- AF for remaining uncertainties:
- 1
- Justification:
- No others uncertainties identified.
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
Local effects
Long term exposure
- Hazard assessment conclusion:
- no hazard identified
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
General Population - Hazard via oral route
Systemic effects
Long term exposure
- Hazard assessment conclusion:
- DNEL (Derived No Effect Level)
- Value:
- 0.833 mg/kg bw/day
- Most sensitive endpoint:
- effect on fertility
- Route of original study:
- Oral
DNEL related information
- DNEL derivation method:
- ECHA REACH Guidance
- Overall assessment factor (AF):
- 1 200
- Dose descriptor starting point:
- NOAEL
- Value:
- 1 000 mg/kg bw/day
- AF for dose response relationship:
- 1
- Justification:
- The starting point for the DNEL calculation is a NOAEL.
- AF for differences in duration of exposure:
- 6
- Justification:
- The dose descriptor starting point has been determined in OECD 422 test. The combined repeated dose toxicity study with the reproduction/developmental toxicity screening test (OECD TG 422) is a combination of a sub-acute toxicity study and the screening study for reproductive/developmental toxicity; therefore, the extrapolation applied is from subacute to chronic.
- AF for interspecies differences (allometric scaling):
- 4
- Justification:
- Allometric scaling factor for rat is 4.
- AF for other interspecies differences:
- 2.5
- Justification:
- An additional factor of 2.5 for other interspecies differences has been applied; therefore, the overall value is 10.
- AF for intraspecies differences:
- 10
- Justification:
- Default value for general population.
- AF for the quality of the whole database:
- 2
- Justification:
- A negative result in OECD 421/422 test may lower the concerns for reproductive toxicity, but can not provide reassurance of the absence of this hazardous property. However, it can provide the basis for deriving a DNELfertility and/or DNELdevelopment from the highest dose level tested and by application of an additional assessment factor of 2 to 5, decided on a case-by-case basis that should account for the limitations of this study.
- AF for remaining uncertainties:
- 1
- Justification:
- No others uncertainties identified.
Acute/short term exposure
- Hazard assessment conclusion:
- no hazard identified
DNEL related information
General Population - Hazard for the eyes
Local effects
- Hazard assessment conclusion:
- high hazard (no threshold derived)
Additional information - General Population
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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