2,4-Pyrimidinediamine, 6-chloro-, 3-oxide

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 18 December 1996 to 19 June 1997

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

the certificate of analysis is missing from the study report

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1997

Report date:

1997

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

17 July 1992

Deviations:

yes

Remarks:

relative humidity occasionally reaching 71%. This modification neither affected the course of the study nor its results

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)

Version / remarks:

29 December 1992

Deviations:

yes

Remarks:

relative humidity occasionally reaching 71%. This modification neither affected the course of the study nor its results

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

2,4-Diamino-6-chloropyrimidine-3-oxide

EC Number:

609-076-5

Cas Number:

35139-67-4

Molecular formula:

C4H5ClN4O

IUPAC Name:

2,4-Diamino-6-chloropyrimidine-3-oxide

Test material form:

solid: particulate/powder

Details on test material:

- Other: pinkish beige agglomerated powder

Specific details on test material used for the study:

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

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS- Source: B&K Universal G.J., S.L. (Sant Vincenç dels Horts, Barcelona, Spain)- Age at study initiation: approximately 10-12 weeks- Weight at study initiation: 2.4-2.5 kg- Housing: Animals were housed individually in stainless steel cages (48 x 59 x 37 cm) with a grille floor, placed on racks.- Diet: free access to a standard rabbit diet UAR 112 (Panlab, S.L., Barcelona, Spain. Expiry date: 1997-05-29) which had been analyzed by the manufacturer- Water: ad libitum by an automatic drinking system. The water was supplied by "Compania de Aguas de Sabadell, S.A." and is periodically checked for the presence of possible contaminants.- Acclimation period: at least seven daysENVIRONMENTAL CONDITIONS- Temperature (°C): 17-23- Humidity (%): 40-70, occasionally reaching levels of 71%- Air changes (per hr): no data- Photoperiod (hrs dark / hrs light): 12/12 (7:00 to 19:00)IN-LIFE DATES: From: 07 January 1997 To: 18 January 1997

Test system

Type of coverage:

semiocclusive

Preparation of test site:

shaved

Vehicle:

other: dampened with water to ensure better contact between the substance and the skin

Amount / concentration applied:

0.5 g

Duration of treatment / exposure:

4 hours

Observation period:

1 hour, 24, 48 and 72 hours after the end of the exposure period.

Number of animals:

3 male rabbits

Details on study design:

TEST SITE- Preparation: 24 hours before administration, animals were shaved using an electric razor, leaving the back and sides exposed from scapula to the pelvis.- Area of exposure: approximately 6 cm2- Application: the substance was placed on 2.5 x 2.5 cm squares of surgical gauze and applied to the corresponding tests area. The patches were held close to the body using strips of adhesive tape.- Type of wrap if used:a strip of gauze was wrapped around the trunk of the animal in order to hold the patches in place. The gauze was fixed to the body using additional adhesive tape.Following administration, animals were observed for a few moments before being returned to their cages.REMOVAL OF TEST SUBSTANCE- Washing (if done): after the bandage and patches were removed, any remains of the test nsubstance were removed with water- Time after start of exposure: 4 hoursOBSERVATION TIME POINTS1 hour, 24, 48 and 72 hours after the end of the exposure periodSCORING SYSTEM: outlined in the OECD guideline n° 404Erythema and Eschar FormationNo erythema ...................................................................................................................................0Very slight erythema (barely perceptible) ......................................................................................1Well defined erythema ....................................................................................................................2Moderate to severe erythema ........................................................................................................3Severe erythema (beet redness) to eschar formation preventing grading of erythema ..............4Oedema FormationNo oedema .........................................................................................................................0Very slight oedema (barely perceptible)..............................................................................1Slight oedema (edges of area well defined by definite raising) ........................................2Moderate oedema (raised approximately 1 mm) ................................................................3Severe oedema (raised more than 1 mm and extending beyond area of exposure) .........4

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Remarks on result:

other: a score of 0 was obtained at the 1h observation time point

Results 2

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Remarks on result:

other: a score of 0 was obtained at the 1h observation time point

Results 3

Irritation parameter:

erythema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Remarks on result:

other: a score of 0 was obtained at the 1h observation time point

Results 4

Irritation parameter:

edema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Remarks on result:

other: a score of 0 was obtained at the 1h observation time point

Results 5

Irritation parameter:

edema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Remarks on result:

other: a score of 0 was obtained at the 1h observation time point

Results 6

Irritation parameter:

edema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Remarks on result:

other: a score of 0 was obtained at the 1h observation time point

Irritant / corrosive response data:

- The readings carried out 1 hour, 24, 48 and 72 hours after treatment showed that none of the animals presented any lesions.- Individual mean scores for erythema and edema, 24, 48 and 72 hours after treatment were all 0.00 for the three animals.

Other effects:

None. The behaviour and physical condition of the rabbits were normal throughout the study.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Under the experimental conditions of this study, the test material is not classified as irritating to the skin according to the Regulation (EC) No 1272/2008 on classification, labelling and packaging (CLP) and the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) criteria.

Executive summary:

This GLP-compliant study was performed to assess the potential of the test material to induce skin irritation in vivo, according to OECD Guideline 404 (dated July 17th, 1992) and EU method B.4 of the E.E.C. directive n° 92/69 (dated December 29th, 1992).

Material and methods

0.5 g of the solid test material were applied under semi-occlusive dressing during 4 hours, on a shaved skin area of 3 male rabbits. Skin reactions were recorded 1 hour and then 24, 48 and 72 hours after the end of the exposure period.

Results

No dermal lesions were observed in any animal at all the observation time points. The individual mean scores (24, 48 and 72 hours) of all three animals for erythema and edema were both: 0.0, 0.0 and 0.0.

Conclusion

Under the experimental conditions of this study, the test material is not classified as irritating to the skin according to the Regulation (EC) No 1272/2008 on classification, labelling and packaging (CLP) and the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) criteria.