Glove Reuse Limits in Hair Dyeing: Permeation of p-Phenylenediamine and Aminophenols Through Natural Rubber Latex and Neoprene After Repeated Washing.

BACKGROUND: Hairdressers often reuse disposable gloves, yet the effect of repeated washing on protection against oxidative hair-dye sensitizers is unclear. OBJECTIVES: To determine how reuse and wash type influence the permeation of p-phenylenediamine (PPD) and aminophenols through natural-rubber-latex (NRL) and neoprene gloves. METHODS: Closed-loop ASTM F739 tests (27°C) were run for five consecutive 8-h exposures, each followed by either a water-only rinse or a detergent wash. Breakthrough time (BT), steady-state permeation rate (PR) and cumulative permeated mass (CPM) were quantified; linear mixed models were used to evaluate the effects of reuse day, wash type and concentration. RESULTS: min; no concentration effect was observed in neoprene. CONCLUSIONS: Barrier performance was governed more by the reuse cycle than the rinse chemistry. Reuse of single-use gloves is not recommended because repeated use and cleaning reduce their protective performance.