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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 201-222-2 | CAS number: 79-74-3
- 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
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Explosiveness
Administrative data
Link to relevant study record(s)
- Endpoint:
- explosiveness
- Type of information:
- other: statement
- Adequacy of study:
- key study
- Study period:
- May 2010
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: The EU method was followed and UN guidance considered. Based on the molecular structure and composition of the test substance a statement rather than a full study was considered sufficient to cover this endpoint.
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EU Method A.14 (Explosive properties)
- Principles of method if other than guideline:
- REACH guidance with regards to explosivity was applied:
A study does not need to be conducted if:
– there are no chemical groups associated with explosive properties present in the molecule; or
– the substance contains chemical groups associated with explosive properties which include oxygen and the calculated oxygen balance is less than –200; or
– the organic substance or a homogenous mixture of organic substances contains chemical groups associated with explosive properties, but the exothermic decomposition energy is less than 500 J/g and the onset of exothermic decomposition is below 500 ºC; or
– for mixtures of inorganic oxidising substances (UN Division 5.1) with organic materials, the concentration of the inorganic oxidising substance is:
– less than 15 %, by mass, if assigned to UN Packaging Group I (high hazard) or II (medium hazard)
– less than 30 %, by mass, if assigned to UN Packaging Group III (low hazard).
Oxygen balance is an expression that is used to indicate the degree to which an explosive can be oxidized. If an explosive molecule contains just enough oxygen to convert all of its carbon to carbon dioxide, all of its hydrogen to water, and all of its metal to metal oxide with no excess, the molecule is said to have a zero oxygen balance. The molecule is said to have a positive oxygen balance if it contains more oxygen than is needed and a negative oxygen balance if it contains less oxygen than is needed. The sensitivity, strength, and brisance of an explosive are all somewhat dependent upon oxygen balance and tend to approach their maximums as oxygen balance approaches zero.
The oxygen balance is calculated from the empirical formula of a compound in percentage of oxygen required for completeconversion of carbon to carbon dioxide, hydrogen to water, and metal to metal oxide.
When using oxygen balance to predict properties of one explosive relative to another, it is to be expected that one with anoxygen balance closer to zero will be potentially explosive; however, many exceptions to this rule do exist. Consideration of potentially explosive groups therefore also needs to be undertaken. - GLP compliance:
- not specified
- Parameter:
- other: Explosive (not specified)
- Remarks:
- migrated information
- Remarks on result:
- negative (not further specified)
- Remarks:
- based on structural features and oxygen balance value
- Interpretation of results:
- non explosive
- Remarks:
- Migrated information
- Conclusions:
- Based on the evaluation of the chemical structure and oxygen balance value of the substance of interest, it is deemed not to be potentially explosive.
Reference
Oxygen Balance (OB) Calculator:
OB% = -1600/Mol.wt of substance x (2X + (Y/2) + M-Z)
X = number of atoms of carbon, Y = number of atoms of hydrogen, Z = number of atoms of oxygen, and M = number of atoms of metal (metallic oxide produced).
OVERALL SUMMARY
Substance Name: 2,5-di-tert-pentylhydroquinone
CAS No: 79 -74 -3
EINECS / ELINCS No: 201 -222-2
Structural Alerts: None
Oxygen Balance Value: -274.78
Potentially Explosive? No
Based on the chemical structure and oxygen balance values of the substance of interest, it isdeemed not to be potentially explosive.
Description of key information
Based on the evaluation of the chemical structure and oxygen balance value of the substance of interest, it is deemed not to be potentially explosive.
Key value for chemical safety assessment
- Explosiveness:
- non explosive
Additional information
The EU method was followed and UN guidance considered. Based on the molecular structure and composition of the test substance a statement rather than a full study was considered sufficient to cover this endpoint.
Justification for classification or non-classification
Based on the above mentioned result, classification according to the CLP Regulation (EC) 1272/2008 and the Dangerous Substance Directive 67/548/EC is not considered necessary.
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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