ASTM G21 Resistance of Synthetic Polymeric Materials to Fungi

ASTM G21 Resistance of Synthetic Polymeric Materials to Fungi

Resistance of plastics and synthetic polymeric materials toward fungal growth is determined by ASTM G21 test method. Synthetic polymers are usually fungus-proof, however, additives like stabilizers and colorants may cause fungal growth in polymeric materials.

  • Average 30% Cost
    Savings

  • 100% Confidentiality
    Guarantee

  • Free, No-obligation
    Consultation

  • 100% Customer
    Satisfaction

    TRUSTED BY ENGINEERS FROM

    Scope:

    Fungal resistance of plastics and synthetic polymeric materials is determined by ASTM G21. The test polymeric materials can be in the form of fabricated and molded articles, sheets, tubes, rods, and film materials. The changes in mechanical, optical, and electrical properties are also determined. Usually, the synthetic polymeric materials are resistant to fungi but there might be additives used in the polymer such as stabilizers, colorants, and plasticizers that may not be resistant to fungi and may contribute to fungal growth. ASTM G21 is typically used to test the products that are made from plastics and foam but it can also incorporate a wide range of other products and materials. 

    Test Procedure:

    For Fungus Testing by ASTM G21, the fungi are grown on solid apparatuses. A pooled spore suspension is made from Chaetomium, Aspergillus,  Penicillium, Aureobasidium, and Trichoderma spores. The spore suspensions are cleaned thoroughly, eluted in a solution having minimum salt, and then standardized. The test samples are placed in triplicate in petri dishes or other suitable containers with minimum salt agar before the pooled spore is sprinkled on the test samples. This process is repeated for the negative control i.e., agar only and positive control i.e., fungal growth control. These preparations are incubated for about 28 days in suitable humidity conditions. A performance score is given for the samples on the basis of fungal growth after 28 days and pictures of each test sample are taken at uniform intervals.

    Sample size:

    The simplest sample can be a piece of size 50×50 mm (2×2 inches), a diameter piece of 50 mm ( 2 inches), or a rod or tubing piece of 76 mm (3 inches) long for the ASTM G21 practice. The film-forming materials like coatings can be tested in the form of films having a size of at least 50×25 mm (2×1 inch).

    Data:

    The following data is determined in ASTM G21:

    The visual rating of fungus growth
    Magnification for rating
    Table of progressive change

    Conclusion:

    Resistance of plastics and synthetic polymeric materials toward fungal growth is determined by ASTM G21 test method.

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing
        •  

          STEP 01

          You share material and testing requirements with us

        •  

          STEP 02

          We ensure your sample pick-up in an ensured manner

        •  

          STEP 03

          We deliver test report to your inbox

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process

            ddd

            Let us combine our capabilities to achieve success!!

              idea icon
              Want to connect with an expert before you leave?