Standard Method for Determining Resistance of Synthetic Polymeric Materials to Fungi
ASTM G21 test method is used to determine the resistance of synthetic polymer and plastic materials to fungal growth.
Pure synthetic polymer materials are usually fungus resistant as they don’t act as a carbon source to support fungal growth. However, other components or additives (such as plasticizers, lubricants, stabilizers, cellulose, and colorants) used in the making of synthetic plastic materials trigger the fungal growth and deterioration process. Therefore, antifungal resistance tests are important to ensure the durability and lifespan of plastic materials that can be affected by fungal growth.
Organisms typically used in this method: Aspergillus brasiliensis, Aureobasidium pullulans, Chaetomium globosum, Trichoderma virens, Penicillium funiculosum
0 – No growth on the specimen
1 – Traces of growth on the specimen (less than 10 %)
2 – Light growth (10 to 30 %)
3- Medium growth (30 to 60 %)
4 – Specimens completely covered with growth (60 %)
At Microbe Investigations (MIS), we test the efficacy of antifungal plastic finishes using ASTM G21 test and other standard test methods like AATCC-30.
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ASTM G21 is a qualitative test method that determines the efficacy of synthetic polymer materials against fungal growth.
ASTM G21 test can be used for a wide range of materials such as molded and fabricated articles, tubes, rods, coatings, pipes, marine plastics, sheets, and film materials.
The standard time duration of the ASTM G21 test is 4-6 weeks.
At Microbe Investigations, we test for the ASTM G21 using the fungal strains : Aspergillus niger (ATCC-16888). Additional strains can be added as per the customer’s testing requirements.