BS ISO 22196:2011 pdf free.Plastics — Measurement of antibacterial activity on plastics surfaces.
Antibacterial materials and products have been widely and rapidly accepted by general consumers as fulfilling a relatively new function, which is distinguishable from the more traditional function of material protection.
Antibacterial products created by incorporating an antibacterial agent (biocide) can suppress the growth of bacteria on the surfaces of products when conditions exist where growth can occur. They can keep surfaces clean and sanitary and can also have an advantage in minimizing the impact on the environment by minimizing diffusion of the agent. This technology is significant for the quality of life, not only in developed countries but also in developing countries.
Antibacterial products have been widely used in plastics, coating materials, ceramics, natural and artificial leather, stainless steel, rubber, etc. The products involved cover a variety of categories, such as electrical appliances, personal items, household goods, nursing-care articles, pet accessories and aircraft-interior fittings.
The scope of the first edition of ISO 22196 was limited to plastics surfaces. In this second edition, the scope has been extended to include surfaces made of other non-porous materials, thus making the second edition applicable to products of the kinds listed above. The test method, which is based on JIS Z 2801[hhl, has remained unchanged.
ISO 22196:2007 specifies a method of evaluating the antibacterial activity of antibacterial-treated plastic products (including intermediate products).
It is not intended to be used to evaluate the effects and propagation of bacteria on plastics without antibacterial treatments. ISO 846 describes tests to evaluate the effects and propagation of bacteria on plastics, which are different from those covered by ISO 22196.
Secondary effects of antibacterial treatments, such as the prevention of biodeterioration and odour, are not covered by the standard, which is not intended to be used or referenced as a method to document or claim biodegradability of plastics.
The standard does not concern plastic building materials, such as PVC or composites, unless they act in the same way as treated articles.
Antibacterial-treated textile products are excluded, even if the surfaces are coated or laminated (such products are covered by ISO 2O743).
Photocatalytic materials and products are excluded (such materials and products are covered by ISO 27447).
The results obtained should include a reference to this International Standard and the conditions used. Results obtained with this International Standard indicate antibacterial activity under the specified experimental conditions used, and do not reflect activity under other circumstances where a variety of factors, such as temperature, humidity, different bacterial species, nutrient conditions, etc., have to be considered. A minimum diffusion of the antibacterial agents/chemicals into the test inoculum is necessary with this procedure.
It is recommended that workers consult ISO 7218.
4 Materials
4.1 Bacteria to be used for the tests
Both of the following species of bacteria shall be used:
a) Staphylococcus aureus;
b) Escherichia coil.
The bacterial strains to be used are shown in Table 1. If bacterial strains obtained from culture collections other than those shown in Table I are used, they shall be obtained from a member agency of the World Federation for Culture Collections (WFCC) or of the Japan Society for Culture Collections (JSCC) and shall be the same strains as those shown in Table I. Prepare stock cultures of these species in accordance with the supplier’s directions.
