Contact allergic reactions to diphenylthiourea and phenylisothiocyanate in PVC adhesive tape

Abstract
Patients (28) reacting to a PVC [polyvinyl chloride] adhesive tape used in routine patch testing gave positive reactions to diphenylthiourea (DPTU) and the phenylisothiocyanate (PITC) in low concentrations. DPTU is a heat stabilizer in the PVC and is partly decomposed to PITC. The 2 substances were also found in another type of PVC. Thioureas giving isothiocyanates are also used in certain types of rubber. Isothiocyanates are present in plants, mainly of the Cruciferae family, and are formed from thiuram sulfides and thiocarbamates. The connection between isothiocyanates derived from different sources should be investigated.