Diisopropylbenzene hydroperoxide

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1989

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Diisopropylbenzene hydroperoxide

EC Number:

247-988-1

EC Name:

Diisopropylbenzene hydroperoxide

Cas Number:

26762-93-6

Molecular formula:

C12H18O2

IUPAC Name:

reaction mass of 1-(3-isopropylphenyl)-1-methylethyl hydroperoxide and 1-(4-isopropylphenyl)-1-methylethyl hydroperoxide

Test material form:

liquid

Test animals

Species:

rabbit

Strain:

other: small white russian Chbb-SPF

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Karl Thomae GmbH, Biberach
- Age at study initiation: no data
- Weight at study initiation: 2.4 kg
- Housing: alone in stainless steel cage
- Diet (e.g. ad libitum): "K4 Alleindiät für Kaninchen" ad libitum
- Water (e.g. ad libitum): tap water ad libitum
- Acclimation period: 14 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20°C
- Humidity (%): 60%
- Air changes (per hr): 15/h
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From: 14/04/1989 To: 18/04/1989

Test system

Type of coverage:

semiocclusive

Preparation of test site:

shaved

Vehicle:

unchanged (no vehicle)

Controls:

not required

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.5 cm3

Duration of treatment / exposure:

4h, 1h and 3min

Observation period:

1 , 24, 48 and 72 hours and 6 days after removal of the dressing

Number of animals:

1

Details on study design:

TEST SITE
- Area of exposure: 6 cm2
- % coverage: no data
- Type of wrap if used: elastic bandage

REMOVAL OF TEST SUBSTANCE
- Washing (if done): softly with warm water
- Time after start of exposure: 3 min, 1 hour, and 4hours

SCORING SYSTEM: according to OECD guideline 404

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Remarks:

4-h exposure

Basis:

animal #1

Time point:

24/48/72 h

Score:

4

Max. score:

4

Reversibility:

not reversible

Results 2

Irritation parameter:

edema score

Remarks:

4-h exposure

Basis:

animal #1

Time point:

24/48/72 h

Score:

4

Max. score:

4

Reversibility:

not reversible

Irritant / corrosive response data:

Right after the patch removing following the 4 h exposure, signs of necrose could be observed, parchementy-like effect at 24h and 48h, and dark-brown scrab after 72h and 6d.
After a period of 1Hr, necrosis also occurred but not after an exposure time of 3 Min

Other effects:

no other effects were observed.

Any other information on results incl. tables

no additionnal data

Applicant's summary and conclusion

Interpretation of results:

Category 1B (corrosive) based on GHS criteria

Conclusions:

Under the conditions of the test, the test substance would be classified as corrosive category 1B according to the criteria of the CLP Regulation (1272/2008).

Executive summary:

In a dermal irritation study conducted according to OECD 404 guideline in compliance with GLP, one healthy adult rabbit of the Whiter Russian strain was exposed to 0.5 ml of DIHP, diisopropylbenze hydroperoxide at 55% in diisopropylbenzene, at one skin site on the back. Test site was covered with a dressing held in place for 4 hours, 1 hour and 3 minutes. The skin reactions were assessed at 1, 24, 48, 72 hours and 6 days after dressing removal.

Application of DIHP resulted in erythema and oedema after 1h and 4h application time. This could be observed after 1h observation period at a sore of 4/4 for both erythema and oedema and could still be observed at this same score after 6 days observation. Additionnally, necrosis could be observed over the 6 days too. After an exposure time of 3 min, no necrosis was observed.