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EC number: 908-343-6 | CAS number: -
The following text is copied from the EU Risk Assessment Report (2003), pg. 114-115:
"The skin sensitising property of nine different 3% hydrogen peroxide preparations was studied with guinea pigs using a modification of the Magnusson-Kligman procedure (Du Pont, 1953). For sensitisation five animals were given six intradermal injections of 0.1 ml 0.1% hydrogen peroxide over a 2-week period; another group of five animals received six times one drop of 3% hydrogen peroxide to the abraded skin. After a 2-week rest period the animals were challenged with a single treatment of the previous type. The skin reactions were observed at 1, 24 and 48 hours. Primary irritancy of substance on intact skin was also studied in the ten animals before the sensitisation treatment and prior to the challenge. The study does not meet modern requirements due to few animals used and inadequate reporting. However, based on summary results, all the nine hydrogen peroxide substances appeared not to sensitise (ten animals used per substance).
There is one clinical report of two cases on positive patch tests to hydrogen peroxide (Aguirre et al., 1994). The first case was a 20-year-old woman, with no previous history of atopy and allergies, who had been working as a hairdresser for 4 years, the other case was a 27-year-old housewife, with no atopy or previous allergies, who had dyed her hair herself at home every 1 to 2 months for the last 6 years. In both cases the skin reactions to 3% hydrogen peroxide were strong; the former patient was positive also for nickel sulfate and 4-aminophenol, the latter for nickel sulfate, PPD, formaldehyde, 4-aminophenol, glyceryl monothioglycolate and cocamidopropylbetaine. The authors reported that 156 other hairdressers patch tested with the hairdresser’s series of chemicals were all negative to hydrogen peroxide 3%. The Dermatological Department at the Finnish Institute of Occupational Health has since 1985 tested dermatitis patients having had exposure to hairdressing chemicals (mainly hairdressers) with a series of test substances containing 3% hydrogen peroxide in water. Computerised records were available concerning test results since 1991: 130 patients have been tested with no allergic reactions, one patient exhibited an irritant reaction. The Finnish Register of Occupational Diseases which was searched from 1975 through 1997 did not contain any cases of allergic dermatosis caused by hydrogen peroxide. The Dermatology Department of the University Central Hospital in Turku, Finland, patch tested 59 patients with 3% hydrogen peroxide during 1995-96, no positive reactions were found (Kanerva et al., 1998).
In spite of two reported cases of positive patch tests to hydrogen peroxide and the uncertainty surrounding an outdated animal study (with a negative result), and on recognition of the widespread occupational and consumer use over many decades, it may be confidently stated that the potential of hydrogen peroxide to cause skin sensitisation is extremely low and therefore do not meet the criteria for classification."
Although no test data are available that assess the skin sensitisation potential of the reaction mass of calcium carbonate and calcium dihydroxide and calcium peroxide, the potential of this multi-constituent substance to cause skin sensitization effects can be sufficiently assessed based on the information that is available for the read-across substances calcium dihydroxide and hydrogen peroxide.
For calcium dihydroxide, the abundance of the Ca2+ ion in the environment and the human body and the buffering capacity of the receiving organism substantiates the lack of any sensitisation potential. Likewise, for hydrogen peroxide, based on the available human and non-human information and recognizing the widespread occupational and consumer use of hydrogen peroxide over many decades, classification as a skin sensitizer is not required.
In accordance to EU Classification, Labelling and Packaging of Substances and Mixtures (CLP) Regulation (EC) No. 1272/2008, classification is not necessary for skin sensitisation based on the available information for read-across substances hydrogen peroxide and calcium hydroxide.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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