Distillates (coal tar), high-temperature, heavy oils

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2007

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods

Qualifier:

according to guideline

Guideline:

other: NF T 20-048 AFNOR (static method)

Version / remarks:

Sept.85

GLP compliance:

no

Type of method:

static method

Key result

Temp.:

20 °C

Vapour pressure:

ca. 0 Pa

Remarks on result:

other: on composite sample: extrapolated from the Vp curve from 294 - 344 °C

Temp.:

25 °C

Vapour pressure:

ca. 0 Pa

Remarks on result:

other: on composite sample: extrapolated from the Vp curve from 294 - 344 °C

Temp.:

50 °C

Vapour pressure:

ca. 0 Pa

Remarks on result:

other: on composite sample: extrapolated from the Vp curve from 294 - 344 °C

Temp.:

294 °C

Vapour pressure:

ca. 2 900 Pa

Remarks on result:

other: on composite sample: measured; calculated from Vp curve: 2,418 pa

Reference 2

Endpoint:

vapour pressure

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Justification for type of information:

REPORTING FORMAT FOR THE ANALOGUE APPROACH

1. HYPOTHESIS FOR THE ANALOGUE APPROACH
The target compound, Distillates (coal tar), high-temperature, heavy oils (EC no. 310-231-1; CAS no. 140203-21-0) as well as the read-across (source) compound, pitch (coal tar) [CAS No. 65996-93-2] are coal tar-borne UVCB substances consisting of a complex mixture of polycyclic aromatic hydrocarbons (PAH), predominantly of condensed four to five-ring aromatic ring systems which form a matrix that is practically insoluble in water. The GC-analytical profiles are very similar, and hence will be the physico-chemical and toxicological properties of these structure-related fractions. It is expected that the mammalian systemic and local or environmental toxicity of the target compound will not be higher than that of the read-across compound, pitch (coal tar).

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
The read-across (source) compound, pitch (coal tar), as heavy coal-tar distillate, shows a very similar PAH-profile: This is due to the fact that the considered coal-tar pitch is the high-molecular, "heavy" RESIDUE of a sequential fractionation procedure of coal tar with the temperature increasing, among others under vacuum distillation. On the other hand, the target compound is the high-termperature re-distillate of a high-molecular, heat-treated coal-tar fraction. This is expressed also in the respective fractions of total analysable GC-volatiles which amount to approx. 10% in coal-tar pich, while the GC volatiles of the target compound sum up to a comparable percentage of 13%.

3. ANALOGUE APPROACH JUSTIFICATION
By far the major part of the highly condensed matrix of Distillates (coal tar), high-temperature, heavy oils (EC no. 310-231-1; CAS no. 140203-21-0) is supposed to be biologically unavailable, as is pitch (coal tar ), the read-across source. This means, poor water solubility as well as mammalian and aquatic toxicological profiles are supposed to closely overlap.

Reason / purpose for cross-reference:

read-across source

Principles of method if other than guideline:

Read-across to preceding entry:
Source test material: Pitch (coal tar), high temperature [CAS no. 65996-93-2]
Reference: DEZA 2008

Key result

Temp.:

20 °C

Vapour pressure:

ca. 0 Pa

Remarks on result:

not measured/tested

Remarks:

extrapolated from Vp-curve

Key result

Temp.:

25 °C

Vapour pressure:

ca. 0 Pa

Remarks on result:

not measured/tested

Remarks:

extrapolated from Vp-curve

Key result

Temp.:

50 °C

Vapour pressure:

ca. 0 Pa

Remarks on result:

not measured/tested

Remarks:

extrapolated from Vp-curve

Temp.:

294 °C

Vapour pressure:

ca. 2 900 Pa

Remarks on result:

other: on composite sample: measured; calculated from Vp curve: 2,418 pa

Description of key information

The estimated vapour pressure of pitch, coal tar, high-temp. is approx. 0.000006 Pa at 293 K (20 °C), and approx. 0.000012 Pa at 298 K (25 °C), extrapolated from the Vp curve at high temperature. It is assumed that this also holds for the target compound, Distillates (coal tar), high-temperature, heavy oils (EC no. 310-231-1; CAS no. 140203-21-0).

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

20 °C