Makeup brush holders are often kept in bathrooms¡ªthe most humid room in the house. This makes them breeding grounds for mold and mildew.
Material Science:
PU Leather with Anti-Mildew Treatment: For soft-sided holders, the Polyurethane (PU) is treated with a chemical barrier that prevents fungi from feeding on the synthetic fibers.
Ventilation Design: Engineering “breathing holes” or using mesh inserts in the design is a standard factory recommendation to prevent moisture entrapment.
ABS Plastic vs. Cheap PP: For hard cases, ABS (Acrylonitrile Butadiene Styrene) is preferred over cheaper plastics because it is more resistant to chemical cleaners and doesn’t develop the “micro-cracks” where mold spores typically hide.