What is ISO 27447 - Antibacterial activity of semiconducting photocatalytic materials about?
ISO 27447 is an international standard on fine ceramics that covers test method for antibacterial activity of semiconducting photocatalytic materials
ISO 27447 specifies a test method for the determination of the antibacterial activity of materials that contain a photocatalyst or have photocatalytic films on the surface, by measuring the enumeration of bacteria under irradiation of ultraviolet light.
ISO 27447 is intended for use with different kinds of semiconducting photocatalytic materials used in construction materials in flat sheet, board, plate shape or textiles that are the basic forms of materials for various applications. It does not include powder, granular or porous photocatalytic materials.
Note: This test method is usually applicable to photocatalytic materials produced for antibacterial effect. Other types of performance of photocatalytic materials, i.e. antifungal activity, antiviral activity, decomposition of water contaminants, self-cleaning, antifogging and air purification, are not determined by this method.
Who is ISO 27447 - Antibacterial activity of semiconducting photocatalytic materials for?
ISO 27447on antibacterial activity of semiconducting photocatalytic materials is useful for:
- Fine ceramics manufacturers
- Semiconducting photocatalytic materials manufacturers
Why should you use ISO 27447 - Antibacterial activity of semiconducting photocatalytic materials?
Under the irradiation of photons, photocatalysts show diverse functions, such as the decomposition of air and water contaminants, as well as deodorization, self-cleaning, antifogging and antibacterial actions. These functions of photocatalysts are generally based on the action of active oxygen species such as hydroxyl (OH) radicals formed on the surface of a photocatalyst. The energy- and labour-saving nature of photocatalysis has attracted keen interest when the photocatalyst is activated by sunlight (or artificial lighting).
Practical applications of photocatalysts for both indoor and outdoor use have rapidly expanded in recent years. Many kinds of photocatalytic materials have been proposed or are already commercialized, based on ceramics, glass, concrete, plastics or paper. Such materials are produced by either the coating or mixing of a photocatalyst; in most cases, titanium dioxide (TiO2).
ISO 27447 was developed for antibacterial activity as a result of continuing efforts to provide test methods for photocatalytic materials. However, antibacterial activity cannot be measured for test pieces with permeable or rough surfaces, so other test methods are required.
ISO 27447 applies to the testing of the antibacterial activity of photocatalytic ceramics and other materials produced by either the coating or the mixing of a photocatalyst. Standards for testing the antifungal activity that use photocatalytic materials will be developed separately.
What’s changed since the last update?
BS ISO 27447:2019 supersedes BS ISO 27447:2009, which is withdrawn.
BS ISO 27447:2019 includes some technical changes with respect to BS ISO 27447:2009. These are:
- Clarification of definition of “photocatalyst antibacterial activity value” in Clause 3
- Inclusion of a statement in Clause 5 regarding treatment of results measured by the viable bacterial count method
- Revision of “storage period of 1/500 nutrient broth” from 1 month ago to 1 week ago in 6.2.2 (formerly 6.2.1)
- Replacement of “black light fluorescent lamp” with “light source” in 7.7 (formerly 7.5) and revision of a statement in 7.7 that the light source shall be 351BLB or 351BL as specified in ISO 10677
- Addition of a new subclause, 6.2.1, renumbering of subsequent subclauses and updating of crossreferences in Clause 6