Antimicrobial and mechanical properties of acrylic resins with incorporated silver–zinc zeolite Casemiro LA et al. - The addition of 2.5% of Irgaguard B5000 to the materials resulted in antimicrobial activity against all strains. Flexural strength decreased significantly with the addition of 2.5% and 5.0% of Irgaguard B5000. The impact strength decreased significantly with the addition of 2.5% and 5.0% of zeolite. [more...]