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Diss Factsheets

Toxicological information

Skin irritation / corrosion

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Administrative data

Endpoint:
skin irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Data is from experimental study report.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2014
Report date:
2014

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
Principles of method if other than guideline:
The objective of the study was to assess the irritant and/or corrosive effects of test chemical after topical application on the intact skin in Rabbits.
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
4,4'-methylenedi-2,6-xylenol
EC Number:
226-378-9
EC Name:
4,4'-methylenedi-2,6-xylenol
Cas Number:
5384-21-4
Molecular formula:
C17H20O2
IUPAC Name:
4-[(4-hydroxy-3,5-dimethylphenyl)methyl]-2,6-dimethylphenol
Details on test material:
- Name of test material (as cited in study report):4, 4’-methylenedi-2, 6-xylenol
- Molecular formula :C17H20O2
- Molecular weight :256.34 g/mol
- Substance type:Organic
- Physical state:White Powder
- A.I Content:99.79%
- Lot/batch No.:Lot 1/03
- Storage condition of test material:Keep away from heat and source of ignition. Keep container tightly closed in a dry and cool place.
- Other:
Handling and Disposal
Safety precautions : Avoid excessive heat and light. Do not breath dust. Aprons,masks, caps, gloves and goggles were used to ensure the health and safety of the personnel.
Disposal : The remaining unused test item was disposed as per internal SOPs of sa-FORD.

Test animals

Species:
rabbit
Strain:
New Zealand White
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source:Procured from RABBI ROOF, Hyderabad
- Age at study initiation:4 to 5 Months (Approximately)
- Weight (Prior to Treatment):Minimum: 2.512 kg and Maximum: 2.652 kg.
- Health Status: Healthy young adults and nulliparous and non-pregnant Rabbits were used for the study.
- Housing:The animals were housed individually in stainless steel cages.
- Room Sanitation:The experimental room floor and work tops were swept and mopped with disinfectant solution every day.
- Cages and water bottle:All the cages and water bottles were changed minimum twice a week.
- Diet (e.g. ad libitum):All animals were provided conventional laboratory rabbit diet (Nutrivet Life Sciences, Pune) ad libitum.
- Water (e.g. ad libitum):Aqua guard filtered tap water was provided ad libitum.
- Acclimation period:Rabbits were acclimatised to the test conditions for a period of 5 days (Animal No.-1) and 7 days (Animal No.-2 and 3) prior to the application of the test item.

ENVIRONMENTAL CONDITIONS
- Temperature (°C):Minimum: 20.00 °C and Maximum: 22.50 °C
- Humidity (%):Minimum: 47.20 % and Maximum: 68.40 %
- Air changes (per hr):More than 12 changes per hour
- Photoperiod (hrs dark / hrs light):12:12

Test system

Type of coverage:
semiocclusive
Preparation of test site:
clipped
Vehicle:
other: distilled water
Controls:
yes
Amount / concentration applied:
TEST MATERIAL
- Amount(s) applied (volume or weight with unit):0.5 gm

VEHICLE (distilled water)
- Amount(s) applied (volume or weight with unit):0.5 ml of distilled water
Duration of treatment / exposure:
4 hours
Observation period:
72 hours
Number of animals:
3 female rabbits
Details on study design:
TEST SITE
- Area of exposure:The dorsal lumbar region at contralateral sites.
- % coverage:Approximately 6 X 6 cm.
- Type of wrap if used:A porous gauze dressing and non-irritating tape (Micropore 3”).

REMOVAL OF TEST SUBSTANCE
- Washing (if done):The residual test item was removed by using cotton soaked in distilled water.
- Time after start of exposure:4 hour

SCORING SYSTEM:Draize Method

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
erythema score
Basis:
animal: #1 ,#2 and #3
Time point:
other: At 24, 48 and 72 hours
Score:
0
Max. score:
4
Reversibility:
no data
Remarks on result:
other: not irritating
Irritation parameter:
edema score
Basis:
animal: #1 ,#2 and #3
Time point:
other: At 24, 48 and 72 hours
Score:
0
Max. score:
4
Reversibility:
no data
Remarks on result:
other: not irritating
Irritant / corrosive response data:
The following were observed in treated rabbits.
The patch was removed after 4 hours and rabbits were observed for erythema and oedema at 1, 24, 48 and 72 hours after patch removal, evaluated and graded as per draize method.
In Animals No.1, 2 and 3 after post patch removal, revealed no erythema and oedema at 24 and 48 and 72 hour during the observation period.
The individual mean score at 24, 48 and 72 hours for Animal Nos. 1, 2 and 3 were 0.00, 0.00, 0.00 and 0.00, 0.00, 0.00, for erythema and oedema formation, respectively.
Other effects:
Clinical Observation
No systemic toxicity was observed at treated rabbits during the experimental period.
Mortality
No mortality was observed during the observation period.

Any other information on results incl. tables

Table 1

Skin Reaction

 

In Treated area Dose:0.5 gm of test item                                                             Sex:Female

 

Animal

No.

Test

Treated

 area*

Erythema score

Oedema score

1h

24h

48h

72h

1h

24h

48h

72h

1

Initial

Left

0

0

0

0

0

0

0

0

2

Confirmatory

Right

0

0

0

0

0

0

0

0

3

Right

0

0

0

0

0

0

0

0

  

In Control area                 Dose:0.5 ml of distilled water                              Sex:Female

 

Animal

No.

Test

Treated area*

Erythema score

Oedema score

1h

24h

48h

72h

1h

24h

48h

72h

1

Initial

Right

0

0

0

0

0

0

0

0

2

Confirmatory

Left

0

0

0

0

0

0

0

0

3

Left

0

0

0

0

0

0

0

0

Key: h = Hour.

Erythema                                                                                                       Oedema

0 =No erythema                                                                                           0 =No oedema


Table 1 Continued…

Mean Individual Animal Score at 24, 48 and 72 hours

 

                     Animal Number                  

Observations                      

1

2

3

Erythema

0.00

0.00

0.00

Oedema

0.00

0.00

0.00

 

  

Table 2

Individual Animal BodyWeight

Sex:Female

Animal

No.

Body Weight (kg)

Prior to Dosing

At termination

1

2.554

2.556

2

2.652

2.720

3

2.512

2.608


Table 3

Individual AnimalClinicalSigns

Sex:Female

Animal

No.

Days (Post dosing Observation)

0

1

2

3

1

1

1

1

1

2

1

1

1

1

3

1

1

1

1

Key: 1 = Normal.


Applicant's summary and conclusion

Interpretation of results:
other: not irritating
Conclusions:
The individual mean score at 24, 48 and 72 hours for Animal Nos. 1, 2 and 3 were 0.00, 0.00, 0.00 and 0.00, 0.00, 0.00, for erythema and oedema formation, respectively.Hence, the test chemical was regarded as non-Irritating to the skin of Female New Zealand White rabbits under the experimental conditions tested and is thus not classified as a skin irritant.
Executive summary:

Acute Dermal Irritation/corrosion Study of test chemical was performed as per OECD guideline No. 404 using three healthy young adult female. The fur of all the rabbits were clipped at contralateral sites, approximately 24 hours prior to treatment. A dose of 0.5 g of test item (moistened with 0.5 ml distilled water) was applied to the skin, over an area of approximately 6 x 6 cm clipped of hair on one side of rabbits. The other untreated side was kept as control area and0.5 ml of distilled water was applied at this site. At the end of 4 hours, the gauze patch was removed and test item application site was wiped with water without altering the integrity of the epidermis. Initially, the test item was applied to the clipped area of skin of one rabbit. The test site was covered with gauze patch. After 4 hours of exposure in animal no. 1, no erythema and no oedema observed at 1, 24 and 48 hour of observation hence a confirmatory test was conducted on additional two rabbits (No. 2 and 3) to confirm the non-irritant nature of the test item.

The patch was removed after 4 hours and rabbits were observed for erythema and oedema at 1, 24, 48 and 72 hours post patch removal, evaluated and graded as per Draize method. In Animals No.1, 2 and 3 after post patch removal, revealed no erythema and oedema at 24 and 48 and 72 hour during the observation period.

The individual mean score at 24, 48 and 72 hours for Animal Nos. 1, 2 and 3 were 0.00, 0.00, 0.00 and 0.00, 0.00, 0.00, for erythema and oedema formation, respectively.

Hence, it was concluded that the test chemical was Non-Irritating to the skin of female New Zealand White rabbits under the experimental conditions tested.