α,α,α',α'-tetramethylxylene-α,α-diol

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

21 June 2011 - 24 June 2011

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The study has some deviations and some information in the report is incomplete. However the study was conducted in accordance with current guidelines and the report includes a QA certification statement.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Report date:

2012

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: The Guidelines for the Testing of Chemicals (State Environmental Protection Administration of China, 2004.5, 404, Acute Dermal Irritation Test)

Deviations:

no

GLP compliance:

no

Remarks:

The laboratory has no GLP accreditation (nevertheless the project plan and the report were audited by the Quality Assurance Unit)

Test material

Test material information

Constituent 1

Reference substance name:

α,α,α',α'-tetramethyl-m-xylene-α,α'-diol

EC Number:

217-886-1

EC Name:

α,α,α',α'-tetramethyl-m-xylene-α,α'-diol

Cas Number:

1999-85-5

Molecular formula:

C12H18O2

IUPAC Name:

2,2'-(1,3-phenylene)dipropan-2-ol

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Test animals

Species:

rabbit

Strain:

other: Japanese white

Details on test animals or test system and environmental conditions:

Four healthy male albino rabbits, 2.1-2.2kg, were supplied by Beijing KeYu Expenerimental Animals Products Center (Certificate No:
SCXK(Jing)2007 -0003).

Animals were kept in animal room in Institute of Laboratory Animal Sciences, CAMS (normal environment, Certificate No.: SYXK(Jing)
2010-0030). Environmental conditions for animal husbandry are maintained with the 12-h light/dark cycle, the temperature of 20-23°C,
and the relative humidity of 40-70%. All animals had free access to sterilized drinking water and irradiation sterilized commercial pellet diets
except during exposure (Beijing HFK Bio-technology Co., Ltd. Certificate No.: SCXK(Jing) 2009- 0008). The tap water was of drinking
water quality (Sterile water for reverse osmosis).Animals were acclimatized to the laboratory conditions for at least 5d prior to the test.

Test system

Type of coverage:

semiocclusive

Preparation of test site:

other: clipped

Vehicle:

water

Controls:

other: The right flank was treated with 0.5 ml distilled water as control

Amount / concentration applied:

0.5 grams

Duration of treatment / exposure:

4 hours

Observation period:

72 hours

Number of animals:

4

Details on study design:

24 hours before the test, the fur on the bilateral dorsal sides (3 X 3 cm2) of rabbits was removed by clipping, respectively.
It was treated with 0.5 g substance (moistened with distilled water) on the left skin area evenly at the second day, and covered with one layer of sulfate paper and two layers of surgical bandages, and fixed with non-irritation tapes, The right free fur area was treated with 0.5 ml distilled water as control, the covering was same as the left, The exposure duration was 4 hours.
Afterwards, the dressing was removed and the residual test substance was cleaned with detergent and warm water.
The test areas were evaluated for both erythema and edema, and compared with the control areas, Scores were given at 24, 48 and 72h
following removal of the dressing. The irritation intensity of the test substance was recorded according to the criteria in "The Guidelines for the Testing of Chemicals".

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 2

Irritation parameter:

edema score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

4

Irritant / corrosive response data:

No erythema was observed on the treated skin area of any rabbit. There was no erythema on the control area of the rabbits. The average score of skin responses was zero.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Under the experimental conditions of the test, a,a,a',a'-tetramethyl-m-xylene-a,a'-diol is considered as non-irritant when applied topically to rabbit skin.

Executive summary:

The acute dermal irritation of the meta-diols isomer was evaluated in rabbits according to OECD 404 guideline.

Four healthy Japanese white rabbits were taken for the test. 0.5g test substance was applied to an area of shaved skin on left of back of four healthy rabbits and the application site was covered with a semi-occlusive dressing for four hours. Following exposure, dermal irritation was evaluated by at 24, 48 and 72h after removal of the dressing. No erythema was observed on the treated skin area of any rabbit. There was no erythema on the control area of the rabbits. The average score of skin responses was 0. In conclusion, under the experimental conditions of the test, a,a,a',a'-tetramethyl-m-xylene-a,a'-diol is considered as non-irritant when applied topically to rabbit skin.