Aluminum, hydrobis(2-methylpropyl)-, reaction products with isoprene

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

other: Not applicable for the substance, given the hazardous nature. The boiling point for the solvent is provided as an indication of the likely boiling point overall

Adequacy of study:

supporting study

Study period:

Not determined

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

According to the Annex VII Standard Information Requirements for REACH, section 7.3, determination of boiling point is required. Column 2 – specific rules for adaption from column 1 – states that the study does not need to be conducted: – for gases; or – for solids which either melt above 300deg C or decompose before boiling. In such cases the boiling point under reduced pressure may be estimated or measured; or – for substances which decompose before boiling (e.g. auto-oxidation, rearrangement, degradation, decomposition, etc.). As no definitive data on melting point is available, and due to the physical nature, no evaluation of decomposition is available, a further consideration is the highly reactive nature of the substance in that aluminum alkyls are highly reactive both towards oxygen (air) and water (see below). As such, it is deemed unsuitable to test the substance itself on these grounds due to the anticipated violent reaction during the study process. It should be noted that substances of this nature are exclusively marketed in liquid state with a stabilising organic solvent and are shipped under UN transport class 4.2 (substances liable to spontaneous combustion / pyrophoric liquids) or at least under class 4.3 (substances which in contact with water emit flammable gases). Safety consideration for Aluminium alkyl solutions is often based on a worst case scenario approach due to the fact that determination of phys-chem endpoints is often not technically feasible due to the highly reactive nature of the substances. The worst case approach that has been adopted and subsequently accepted for substances of this nature by both the EU and UN transport authorities is to use for classification purposes the data on the pure solvent. Use of such a consideration for the boiling point study endpoint is to instead take account of the boiling point of the pure solvent used to formulate the respective solution. This approach is considered as worst case in the sense that any non-volatile substance dissolved in a volatile solvent decreases the subsequent vapour pressure of the respective solution compared to pure solvent. At same time lower vapour pressure of solution will also end up in higher boiling point compared to pure solvent. As such, the predicted boiling point of the final solution is likely to be higher further mitigating risk. However for assessment purposes the vapour pressure of the solvent is considered as appropriate on a worst case basis. Therefore, the data presented below is applied as the boiling point of the solvent that contains the substance, which used to formulate following synthesis for safety in handling. No definitive study on the solvent / substance mixture is available. This approach is deemed appropriate as hazardous physical nature of the substance precludes physically testing for this endpoint.

Data source

Reference

Reference Type:

other company data

Title:

Unnamed

Year:

2009

Report date:

2009

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Use of the value for the hydrocarbon solvent is considered appropriate for this endpoint, given the physically hazardous nature of the substance.

GLP compliance:

no

Type of method:

other: read across to constituent solvent.

Test material

Test material information

Constituent 1

Reference substance name:

Naphtha (petroleum), hydrotreated light; CAS [64742-49-0]; EINECS [265-151-9]

IUPAC Name:

Naphtha (petroleum), hydrotreated light; CAS [64742-49-0]; EINECS [265-151-9]

Details on test material:

No data available.

Results and discussion

Boiling point

Boiling pt.:

60 - <= 125 °C

Atm. press.:

other: Based on solvent alone; assumed atmospheric pressure.

Remarks on result:

other: The above value is presented for the constituent solvent as the physical hazards preclude the test for this endpoint.

Applicant's summary and conclusion

Conclusions:

The boiling point of the constituent solvent is presented for this endpoint, as it is not considered suitable to test for this endpoint via conventional tests, due to the physical hazards associated with the substance. The value presented is indicative of the likely boiling point range that is available in the finished product which is diluted in solvent for ease of handling.

Executive summary:

The boiling point of the constituent solvent is presented for this endpoint, as it is not considered suitable to test for this endpoint via conventional tests, due to the physical hazards associated with the substance. The value presented is indicative of the likely boiling point range.