6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol

Boiling point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

boiling point

Type of information:

not specified

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The value for the boiling point of DBMC is cited in the OECD SIDS report (2000) which is a valid data source. As no details on the determination of the boiling point are available, the value is reliable with restrictions.

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Principles of method if other than guideline:

Materials and methods used for the determination of the boiling point are not reported.

GLP compliance:

not specified

Type of method:

other: no data

Boiling pt.:

187 °C

Atm. press.:

0.07 hPa

No remarks

Conclusions:

The boiling point of DBMC is cited to be 187 °C at 0.07 hPa.

Executive summary:

The boiling point of DBMC is 187 °C at 0.07 hPa as cited in the OECD SIDS report.

Reference 2

Endpoint:

boiling point

Type of information:

(Q)SAR

Adequacy of study:

weight of evidence

Study period:

2009

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

The boiling point of DBMC was calculated with the programme MPBPWIN (v1.41) from EPIWIN v3.20 (recommended in the REACH Guidance on information requirements and chemical safety assessment, Chapter R.7.1.3.3, Table R.7.1-12) and cited in the PBT report.

Justification for type of information:

QSAR prediction

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Principles of method if other than guideline:

The boiling point was estimated with the programme MPBPWIN (v 1.41).

GLP compliance:

no

Type of method:

other: QSAR method

Boiling pt.:

445 °C

Remarks on result:

other: value calculated

No remarks

Conclusions:

The boiling point of DBMC is calculated to be 445 °C.

Executive summary:

The boiling point of DBMC is cited in the PBT report to be 445 °C as calculated with the programme MPBPWIN (v1.41). Calculations carried out with the latest versions of the programme, MPBPWIN version v1.42 and v1.43, delivered the same results.

Reference 3

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

1982

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

The report on ANTIOXIDANT MBP 5 from the Société Française D'Organo-Synthèse gives information on the melting point and thermal stability of Antioxidant MBP 5 which is chemically equivalent to DBMC. The method used for the determination of the thermal stability is not indicated, thus the information provided in this report is reliable with restrictions.

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Principles of method if other than guideline:

The method used for the determination of the thermal stability is not reported.

GLP compliance:

no

Type of method:

other: not available

Decomp. temp.:

ca. 200 - 220 °C

Remarks on result:

other: Decomposition starts over 200 - 220 °C

Thermal stability: Good stability below 170 - 175 °C. Decomposition starts over 200 - 220 °C.

Conclusions:

The substance starts to decompose over 200 - 220 °C.

Executive summary:

The Antioxidant MBP 5, which is chemically equivalent to DBMC, is a solid possessing good thermal stability below 170 - 175 °C. As the material starts to decompose over 200 - 220 °C the boiling point is not measurable at atmospheric pressure.

Description of key information

Weight-of-evidence:
At 0.07 hPa, the boiling point of DBMC lies in the range of 185 - 187 °C as reported in two reliable data sources (PBT Working Group, 2009; OECD SIDS, 2000).
At atmospheric pressure, the boiling point of DBMC is not measurable due to decomposition of the substance at 200 - 220 °C as mentioned in the SFOS report (JE/NC, 1982).

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

186 °C