Procedure: ASTM G utilizes a nutrient salts agar that provides all of the trace nutritional elements needed by fungi to support growth. However, to achieve a. Buy ASTM G PRACTICE FOR DETERMINING RESISTANCE OF SYNTHETIC POLYMERIC MATERIALS TO FUNGI from SAI Global. ASTM G Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi. This practice covers determination of the effect of.
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Determination of these effects is not covered in this practice. If handling is necessary gloves, should be worn while handling test specimens.
As the voice of the G21-90. The fungus results are usually determined and recorded as a growth rating:. Spores are grown for approximately 2 — 3 weeks, followed by inoculation of the spore suspension the combined spores that are selected for testing and placed in a test chamber for 28 days or as specified.
Other effects include preferential growth caused by nonuniform dispersion of plasticizers, lubricants, and other processing additives.
Please first log in with a verified email before subscribing to alerts. Pronounced physical changes are observed on products in film form or as coatings, where the ratio of surface to volume is high, and where nutrient materials such as plasticizers and lubricants continue to diffuse to the surface as they are utilized by the organisms. This ensures that you are always up-to-date and saves you both time and money. Contamination can have a negative effect on the test results since it could easily provide nutrients to the fungus for growth.
asfm Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions of the standards required in your work. Add to Alert PDF. NTS engineers are extremely careful handling samples for fungus testing, as the cleanliness of the specimens is important prior to testing — especially testing being conducted on a cleaning or decontamination process.
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If the samples are mishandled or suspected atm contamination prior to testing, they should be cleaned, Testing cannot be conducted on specimens until 72 hours have passed. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The test can reveal if the specimen being analyzed supplies sufficient nutrition for fungal growth.
Attack on these materials often leaves ionized conducting paths. Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. To assess materials other than plastics, use of this test method should be agreed upon by all parties involved. It can also show, for long test durations, the effects fungus may have on the test specimen, such as changes in appearance, or in mechanical and electrical properties.
ASTM G21 – National Technical Systems
To aastm degrees, live fungi will use wood, paper, leather, hydrocarbons, PVC, polyurethanes, certain plastics and paints, along with other materials, as fuel for growth. This service is not available if you are a URL user where you do not log in with an email address. This standard is not included in any packages. It is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, that are responsible for fungus attack on plastic materials.
Many products that operate in warm, humid environments must be tested to v21-09 fungal attacks, since this problem can cause myriad of operational challenges. Types of Fungal Attacks Fungus can disrupt systems and cause damage in g2-09 ways, including: Test methods are used to determine the effect of fungi on the properties of synthetic polymeric materials in the form of molded and fabricated articles, tubes, rods, sheets, and film materials.