The International Organization for Standardization (ISO) has published standard ISO/TS 20660:2019, “Nanotechnologies — Antibacterial silver nanoparticles — Specification of characteristics and measurement methods.”  The standard provides guidance for the specification of characteristics and relevant measurement methods for silver nanoparticles in powder or colloidal forms that are intended for antibacterial applications in nanotechnology.  ISO states that the standard is intended to aid the producer in providing the physicochemical characteristics of silver nanoparticles that have an antibacterial effect to the buyer.  ISO notes that the standard does not cover considerations specific to health and safety issues either during manufacturing or use.