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Fungus Resistance Testing
Fungus and microbial organisms can be detrimental to the operation and appearance of products that are operated in environments that are warm and humid. Operationally, fungus growth can cause corrosion, mechanical failures, premature wear and unintended electrical conduction paths. Aesthetically, fungus growth causes products to be less attractive and can lead to devices not being used even if there is no impact on operations. Fungal infections can occur when fungus is transferred from a product to the user.
Materials such as hydrocarbons, leather, paints, paper, plastics, polyurethanes, PVC and wood can serve as fuel and nutrients for live fungi to grow. Even material that is fungal resistant can promote fungus growth when external contaminants such as fluids, organic material and sweat are introduced. Because of this, there is no product or material that is truly fungus-resistant.
Fungus resistance testing is the process of introducing a naturally-occurring spore to a product or material. Some of the more common spores include Aspergillus niger, Aspergillus flavus, Aspergillus versicolor, penicillium funiculosum, and Chaetomium globosum.
Once the spore is applied, it is placed in a chamber with a hot and humid environment. The testing or inoculation period can range from a couple of weeks to several months, depending on the requirements and the spore(s) being introduced. The determining factor of fungus growth is food. If the material contains food and nutrients, fungus will grow.
The products and materials that must undergo fungal resistance testing include:
- Certain aviation products
- Products subjected to hot and humid conditions
- Consumer products
- Certain military products
Some of the more common fungus resistance testing standards are:
- ASTM G21
- IEC 60068-2-10
- ISO 846
- MIL-STD 810
- SAE J1455
With significant fungus testing experience, Keystone Compliance can assist with any fungus resistance requirements that you have. It is best to determine if there is a fungus among us on your product or material in the lab as opposed to in the field. Contact us today for a free fungus resistance testing quote.