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

Auto flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

auto-ignition temperature (liquids)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods

Qualifier:

according to guideline

Guideline:

other: DIN 51794

GLP compliance:

no

Key result

Auto-ignition temperature:

> 560 °C

Atm. press.:

ca. 101 kPa

Remarks on result:

other: on composite sample 08; substance is solid at ambient temperature with a softening point of > 65°C at 101 kPa

Reference 2

Endpoint:

auto-ignition temperature (liquids)

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 similar to that of pitch (coal tar ), the read-across source, based on the similarity of composition. This means, the physico-chemical properties will closely overlap for both structure-related UVCB compounds.

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: RÜTGERS 2010_Autoflammability

Key result

Auto-ignition temperature:

> 560 °C

Atm. press.:

ca. 101 hPa

Remarks on result:

other:

Remarks:

on composite sample 08; substance is solid at ambient temperature with a softening point of > 65°C at 101 kPa

Description of key information

The ignition temperature of the read-across source, pitch, coal tar, high-temp., is > 560 °C. 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

Autoflammability / Self-ignition temperature at 101 325 Pa:

560 °C