1,3-dichlorobut-2-ene

Endpoint summary

Description of key information

-Skin irritation/corrision: 1,3-dichlorobut-1-ene is corrosive to the skin of rabbits (Du Pont 1999, 1970, no guidelines followed)

Key value for chemical safety assessment

Skin irritation / corrosion

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (corrosive)

Additional information

OECD SIDS, 2007:

Skin Irritation

1,3-dichlorobut-1-ene was not a corrosive substance in the in vitro International CorrositexTM assay (DuPont, 1999a). A follow-up in vivo study was conducted in one rabbit to confirm this result. Two sites were tested, one for 3 minutes and one for one hour. At the skin site treated for 3 minutes with 1,3-dichlorobut-1-ene, mild erythema, but no edema was noted. At 24 hours after test substance removal, moderate erythema and moderate edema were observed. At 48 and 72 hours after test substance removal, moderate erythema and severe edema were observed. After a 1-hour exposure, moderate erythema and severe edema were observed. Necrosis, severe erythema, severe edema, and a raw spot were observed at 24, 48, and 72 hours after test substance removal. Microscopic examination of the 3-minute test site revealed multifocal minimal ulceration with degeneration of adjacent collagen and diffuse mild epidermal hyperplasia. Microscopic examination of the 1-hour test site revealed severe transmural necrosis with hemorrhage and edema (DuPont, 1999b). Similar results were observed in a 24-hour dermal irritation study with rabbits (DuPont, 1970).

Studies in Humans

On human epidermis, 1,3-DCB caused an itching and burning sensation in 3 minutes. At 6 minutes, the itching and burning sensation had vanished and there was no skin inflammation (Roubal and Pokorny, 1943). No information on the exposure conditions, number of individuals tested, or test substance purity were available. In contrast to this report, current plant site experience indicates that 1,3-DCB is irritating and corrosive to human skin. Eye Irritation No eye irritation studies were identified with 1,3-DCB but based on its corrosivity, 1,3-DCB is likely to be severely irritating to the eyes.

Conclusion

1,3-DCB is corrosive to the skin of rabbits. Occupational experience shows that 1,3-DCB is also irritating and corrosive to the skin, and that 1,3-DCB vapour is irritating to the eyes and respiratory tract. No eye irritation studies were identified with 1,3-DCB but based on its corrosivity, 1,3-DCB is likely to be severely irritating to eyes

Effects on skin irritation/corrosion: corrosive

Justification for classification or non-classification

On the basis of the test results, 1,3-dichlorobut-2 -ene should be classified as C, R34 according to DSD classification criteria and Skin Corr. 1B, H314 (Causes severe skin burning) according to CLP classification criteria.