Registration Dossier
Registration Dossier
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EC number: 269-110-6 | CAS number: 68187-58-6 The residue from the distillation of thermal cracked or steam-cracked residuum and/or catalytic cracked clarified oil with a softening point from 40°C to 180°C (104°F to 356°F). Composed primarily of a complex combination of three or more membered condensed ring aromatic hydrocarbons.
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- PBT assessment does not apply
- Justification:
- Persistence
As indicated in the REACH Guidance of PBT assessment, Section C.1.3, page 5 [information_requirements_part_c_en.pdf, dec. 2011], persistency testing is practically not possible due to the refractory inherent properties and complexity of this UVCB substance.
Wording in the REACH Guidance:
"....However, for substances for which persistency testing is difficult or practically impossible, like e.g. for certain multi-constituent or very poorly water soluble substances, it may sometimes be more reasonable to start the PBT/vPvB assessment by evaluating the B criterion (see Section R.11.1.3.2 for further guidance)."
- Bioaccumulation
Petro pitch is a practically water-insoluble UVCB substance and cannot pass biological membranes due to its complex high-molecular matrix structure. Hence, a pitch-specific BCF-value cannot be determined. Besides its poor bioavailability, the determination of a partition coefficient proved to be technically not feasible due to its very limited solubility (see phys.-chem. data. Chapter 1.3.). Hence, the bioaccumulation criteria for PBT are not applicable to petro pitch itself.
Wording in the REACH Guidance, Section C.1.4.2, page 6:
"...However, for a substance produced or imported at a level of 100 t/y or more, information on bioconcentration in aquatic species has to be made available by the registrant and to be considered in the assessment, unless this information can be waived according to column 2 of Annex IX or according to Annex XI(3) (e.g. low bioaccumulation potential, no exposure, testing technically not possible)."
- Toxicity Assessment
Based on structure-analogy, petro pitch is not expected to show chronic aquatic toxicity under standard experimental conditions. However, it is classified as CMR substance. Therefore, the T criterion is fulfilled.
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