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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The Fungus Resistance test is used to determine the resistance of key materials to fungi, and to determine if these materials are adversely affected by fungi under conditions favorable for their development… namely, high humidity, warm atmosphere, and presence the of inorganic salts.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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. The benefits of a subscription: If the document is revised or amended, you will be notified by email.
Webprint Printed and bound. 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. This service is not available if g21-0 are a URL user where you do not log in with an email address.
Please first log in with a verified email before subscribing to alerts. 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.
Other effects include preferential growth caused by nonuniform dispersion of plasticizers, lubricants, and other processing additives.
NTS engineers astn 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. It is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, that are responsible for fungus attack on plastic materials. Your Alert Profile lists the documents that will be monitored.
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ASTM G21 – National Technical Systems
As the voice of the U. In order to minimize contamination, good practices include not removing the test specimens from the packaging until it is time for inoculation. 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.
To varying degrees, live fungi will use wood, paper, leather, hydrocarbons, PVC, polyurethanes, certain plastics and paints, along with other materials, as fuel for growth. The fungus results are usually determined and recorded as a growth rating:.
You may delete a document from your Alert Profile at any time. To assess materials other than plastics, use of this test method should be agreed upon by all parties involved. Please first verify your email before subscribing to alerts. Subscription – always available and updated A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. Subscription pricing is determined by: 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.
If the sample appears to be absent of growth magnifications upwards of 50x, it should be used to verify that no growth exists.
Historical Version s – view previous versions of standard. The inch-pound units given in parentheses are for information only. Contamination can have a negative effect on the test results since it could easily provide nutrients to the fungus for growth.
The test can reveal if the specimen being analyzed supplies sufficient nutrition for fungal growth. This standard is not included in any packages. Link to Active This link will always route to astn current Active version of the standard. Need more than one copy? Monitoring Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions astmm the standards required in your work.
Changes in optical, mechanical, and electrical aetm may be determined by the applicable ASTM methods. Start Webshop Product catalog Product presentation. To ensure that estimates of behavior are not too optimistic, the greatest observed degree of deterioration should be reported. The fungus results are usually determined and recorded as a growth rating: The inch-pound units given in parentheses are for information only.
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Determination of these effects is not covered in this practice. Read more about subscriptions. Proceed to Checkout Continue Shopping. Many products that operate in warm, humid environments must be tested to withstand fungal attacks, since this problem can cause myriad of operational challenges.
There could be fungal spores on the samples that are not readily visible to the eye due to the size of the spores, localized areas of growth, or because the color of the spores are similar to those of the test specimen.
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