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

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

GLP compliance:

yes (incl. QA statement)

Specific details on test material used for the study:

INFORMATION ON TEST MATERIAL
- Name of test material (as cited in study report): coal tar pitch (composite sample 8)
- Substance type: organic
- Lot/batch No.: A-10063A
- Expiration date of the lot/batch: 24 Sep. 2011

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: room temperature in the dark

Key result

Test procedure:

burning time (test type not further specified)

Burning time:

> 10 min

Remarks on result:

other: no progression of burning/combustion without ignition source

The flame of the gas burner did ignite the test substance pile, which melted, burned with yellow flame and turned into a black residue. White smoke was observed. After removal of the ignition source, the flame extinguished immediately, and no propagation of combustion was observed along 200 mm length of the pile within 4 min.

Interpretation of results:

GHS criteria not met

Reference 2

Endpoint:

flammable solids

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: NOTOX 2010_Flammability

Key result

Test procedure:

burning time (test type not further specified)

Burning time:

> 10 min

Remarks on result:

other: no progression of burning/combustion without ignition source

Description of key information

For the read-across source, CTPht, the flame of the gas burner did ignite the test substance pile, which melted, burned with yellow flame and turned into a black residue. Without ignition source, the flame extinguished immediately, and no propagation of combustion was observed along 200 mm length of the pile within 4 min.

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

Flammability:

not classified