Permanence of Biocides

As with other additives, it is possible for biocides to be extracted and lose their effectiveness. The principles being used to minimise extraction and achieve permanence include the use of  

The release of silver ions is usually accompanied by a colour change. 

The German company Helm AG is marketing silver-based biocides in a glass matrix, i.e., glass particles, in the belief that it will persist longer and offer better long-term protection than organic biocides incorporated in the normal manner. 

Sanitized has continued to work in close co-operation with Clariant in developing antimicrobial technology, and Clariant has pmchased JMAC s silver biocide technology. 

Sanitized AG has developed Sanitized Silver, which uses a transparent glass ceramic carrier, requires a relatively low dose level, has good high-temperature resistance and is said not to affect the appearance of transparent plastics by dulling them. It has been granted FDA approval for food contact. Ciba Specialty Chemicals has some silver zeolite antimicrobial products those for thin or transparent articles are glass-based. 

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