Naphtha (petroleum), steam-cracked, C8-10 aromatic hydrocarbon fraction, alkylated and oligomerised

Acute Toxicity: inhalation

Administrative data

Endpoint:

acute toxicity: inhalation

Type of information:

experimental study

Adequacy of study:

key study

Study period:

02 - 16 Dec. 2009

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 403 (Acute Inhalation Toxicity)

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.2 (Acute Toxicity (Inhalation))

GLP compliance:

yes (incl. QA statement)

Test type:

traditional method

Limit test:

yes

Test material

Test material information

1

Reference substance name:

Naphtha (petroleum), steam-cracked, C8-10 aromatic hydrocarbon fraction, alkylated and oligomerised

EC Number:

701-299-7

Molecular formula:

not applicable (depends on the monomers; see "Structural formula")

IUPAC Name:

Naphtha (petroleum), steam-cracked, C8-10 aromatic hydrocarbon fraction, alkylated and oligomerised

Test material form:

liquid: viscous

Details on test material:

- Manufacturers identification: Novares TL 10, Novares L 100, Novares L 800, Novares C 10 (different types/technical products of the substance)
- Substance type: organic
- Test material is 'Naphtha (petroleum), steam-cracked, C8-10 aromatic hydrocarbon fraction, alkylated and oligomerised', EC list number 701-299-7 (assigned by ECHA after request for change of EC number/EC name). Originally, the substance Hydrocarbons, C9-unsaturated, polymerised, CAS No. 71302- 83-5, was submitted for registration. Subsequent to substance validation, the identity of the substance was changed by ECHA (EC number 615-276-2 and new name 'Distillates (petroleum), steam-cracked, C8-12 fraction", mainly C8 - C10 unsaturated aromatic and alkylaromatic hydrocarbons, predominantly styrene- and indene-derivatives, obtained by Lewis acid-initiated alkylation and polymerisation').
- for additional information see respective study records

Specific details on test material used for the study:

- Name of test material (as cited in study report): Novares TL 10; CAS-no. 71302-83-5 (Hydrocarbons, C9- unsaturated, polymerized)
- Composition of test material, percentage of components: see Section 1.2 Composition
- Lot/batch No.: 28724
- Stability under test conditions: no measured data; based on chemical structure assumed to be stable
- Storage condition of test material: room temperature, exclusion of light

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Harlan Laboratories Ltd, Oxon, UK
- Age at study initiation: 8 - 12 wks
- Weight at study initiation: 267 - 310 g (m); 197 - 210 (f) [see Appendix 6]
- Fasting period before study: no
- Housing: solid-floor polypropylene cages, groups of 5 by sex
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: ≥ 5 d

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19 - 25
- Humidity (%): 30 - 70
- Air changes (per hr): ≥ 15x/h
- Photoperiod (hrs dark / hrs light): 12 / 12

Administration / exposure

Route of administration:

inhalation: aerosol

Type of inhalation exposure:

nose only

Vehicle:

other: diethyl ether

Mass median aerodynamic diameter (MMAD):

2.38 µm

Geometric standard deviation (GSD):

2.37

Details on inhalation exposure:

GENERATION OF TEST ATMOSPHERE / CHAMBER DESCRIPTION
- Exposure apparatus: Cylindrical exposure chamber
- Exposure chamber volume: approx. 30 litres (dimensions: 28 cm diameter x 50 cm high)
- Method of holding animals in test chamber: individually held in a tapered, polycarbonate restraining tube
- Method of conditioning air: Compressed air supplied by means of an oil free compressor and passed through a water trap and respiratory quality filters before it was introduced to the nebuliser.
- Air flow through chamber: 50 L/min
- System of generating particulates/aerosols: Glass concentric jet nebuliser located at the top of the exposure chamber / Nebuliser connected to a glass syringe attached to an infusion pump providing the material formulation
- Method of particle size determination: 3x during the exposure, using a Marple Personal Cascade Impactor with six impactor stages (9.0, 6.3, 4.0, 1.7, 0.81, and 0.30 µm cut points). The collection substrates and backup filter were weighed before and after sampling and the weight of test material, collected at each stage, calculated by difference (Results in Report Fig. 3 and 4).
- Method of particle collection: by weighed glass fibre filter placed in a filter holder and temporarily sealed in a vacant port of the exposure chamber in the animals’ breathing zone.
- Volatile / non-volatile fraction: The mean non-volatile component of the batch used during the study was found to be 100% (n=10).
- Procedure: Prior to the start of the study, the non-volatile component of the test material was determined by adding a small, known amount of test material to glass fibre filters and recording their weights. The filters were then dried in a desiccator between 19 and 20 °C for approx. 24 h and then weighed again. The difference in the two weights was taken as the volatile content of the test material and the non-volatile component was calculated as a percentage.
- Treatment of exhaust air: bottom outlet through a "scrubber" trap, connected with a high efficiency filter to a metered exhaust system
- Temperature, humidity, pressure in air chamber: 19 - 20 °C, 39 - 47% (rel.hum.), slight low-pressure [Report, Appendix 9]

TEST ATMOSPHERE
- Brief description of analytical method used: particle/aerosol gravimetric determination
- Samples taken from breathing zone: yes

VEHICLE
- Composition of vehicle (if applicable): diethyl ether
- Concentration of test material in vehicle (if applicable): 50 % (w/w)
- Justification of choice of vehicle: high viscosity of the TS, to improve aerolisation of the TS

TEST ATMOSPHERE (if not tabulated)
- Particle size distribution: 72.7% < 4 µm
- MMAD (Mass median aerodynamic diameter) / GSD (Geometric st. dev.): 2.38 µm

Analytical verification of test atmosphere concentrations:

yes

Remarks:

gravimetrically (aerosol)

Duration of exposure:

4 h

Concentrations:

Mean: 5.14 ± 0.64 mg/L (n = 17) / nominal: 16.1 mg/L

No. of animals per sex per dose:

5

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: day 0, 7, 14
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight, organ weights, histopathology, other:

Statistics:

For particle size: arithmetic mean + standard deviation / MMAD derived from probits of stage amounts plotted against Log10 cut-point size + geometric standard deviation / LD50: not relevant

Results and discussion

Effect levels

Effect levels 1

Key result

Sex:

male/female

Dose descriptor:

LC50

Effect level:

> 5.14 mg/L air (analytical)

Based on:

test mat.

Exp. duration:

4 h

Effect levels 2

Key result

Sex:

male/female

Dose descriptor:

LC0

Effect level:

5.14 mg/L air (analytical)

Based on:

test mat.

Exp. duration:

4 h

Remarks on result:

other: standard deviation: 0.64 mg/L

Mortality:

none

Clinical signs:

other: Hunched posture, pilo-erection, and increased respiratory rate commonly seen for short periods following 4h inhalation. One day after exposure, all animals appeared normal.

Body weight:

One male with bw transiently reduced during week 1;
Normal bodyweight development was noted for all other animals during the course of the study [see Report Appendix 6].

Gross pathology:

No macroscopic abnormalities

Any other information on results incl. tables

The particle size analysis of the atmosphere drawn from the animals’ breathing zone, was as follows

[see Report Appendices 1 and 2]:

 

Mean Achieved Atmosphere Concentration ± SD (n = 17) [mg/L]	Mean Mass Median Aerodynamic Diameter (n = 3) [µm]	Geometric Standard Deviation [mm]	Inhalable Fraction [wt% < 4 µm]
5.14 ± 0.64	2.38	2.37	72.7

 

Applicant's summary and conclusion

Interpretation of results:

Category 5 based on GHS criteria

Remarks:

according to Regulation (EC) 1272/2008 (CLP regulation) no classification required

Conclusions:

No classification required according to Regulation (EC) 1272/2008 (CLP regulation)