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The aim of this study was to investigate the sensitizing potential of 12 di(meth)acrylates when tested in the Guinea Pig Maximization Test (GPMT) and Freund's Complete Adjuvant Test (FCAT). In these tests the same (malar) concentration was used for intradermal induction. The results (see table, below) show that dimethacrylates are moderate to strong sensitizers in the guinea pig. In the group of diacrylates, no sensitization to diethylene glycol diacrylate was observed, 1,2-ethenediol diacrylate and 1,6-hezanediol diacrylate sensitized a number of animals. The challenge reaction pattern of the FCAT with 1,4-butanediol diacrylate, neopentane diol diacrylate and 1,5-pentanediol diacylate differed from that commonly observed with sensitizers. Positive reactions were seen only to the maximum non-irritant concentration at 24 h in the challenge at day 21. At 48 h and in the second challenge at day 35, the reactivity had decreased or disappeared. This different reaction pattern makes it difficult to classify these monomers with certainty as sensitizers. In most of the FCATs, a decrease in reactivity in successive challenges was found. Possible explanations for this decrease and for the different challenge reaction patterns of some diacrylates are discussed. The skin irritant capacity of dimethacrylates was estimated after one open application. Diacrylates are very strong irritants on guinea pig skin. Dimethacrylates are weak irritants. [ABSTRACT FROM AUTHOR]

The aim of this study was to investigate differences in the sensitizing potential of 14 mono(meth)acrylates, when tested by the guinea pig maximization test (GPMT) and Freund's complete adjuvant test (FCAT) with an identical, intradermal induction concentration. A new grading classification of the sensitization potential is proposed. Mono(meth)acrylates show a wide range of sensitizing potential. Compared with other (meth)acrylates, methyl methacrylate is a moderate sensitizer. Attention was paid to concomitant sensitization of additives. In 9 of 16 FCATs, concomitant sensitization occurred to the inhibitors hydroquinone and p-methoxyphenol. [ABSTRACT FROM AUTHOR]