ISO 846

Plastics — Evaluation of the action of microorganisms

Within the scope of the ISO 846 standard, it covers a series of microbial tests that must be performed to determine the changes in plastic and polymeric materials caused by bacteria and fungi. The resistance of plastic materials used in the production of packaging materials used in food and cosmetic products against bacteria and fungi can be determined within the scope of ISO 846 standard.

ISO 846 standard tests can only be applied to all items made of polyurethane and/or plastic that are easily cleaned and have a flat surface. As an exception, it can also be applied to plastic foam porous materials.

Microorganisms can adhere and colonize on plastic packaging. Over time, the presence and metabolism of microorganisms damage the plastic structure. Microorganisms affect plastics directly or indirectly in two ways.

While the degradation process caused by the use of plastic as food is the direct effect, the effect of the metabolic products of the microorganisms is the indirect effect. During the 21-day test period, the effects of bacteria and fungi on packaging materials can be evaluated with 3 different methods.

Preferred standards other than ISO 846 are:
• ASTM G-21 Test
• ASTM G-22 Test