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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NTS engineers are extremely careful handling samples for fungus testing, as the cleanliness of the specimens is important prior to testing — v21-09 testing being conducted on a cleaning or decontamination process. Subscription pricing is determined by: Standards Subsctiption may be the perfect solution. This ensures that you are always up-to-date and saves you both time and money.
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. The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email.
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The fungus results are usually determined and recorded as a growth rating:. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. 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.
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ASTM G21 – National Technical Systems
Historical Version s – view previous versions of standard. If handling is necessary gloves, should be worn while handling test specimens. To astmm degrees, live fungi satm use wood, paper, leather, hydrocarbons, PVC, polyurethanes, certain plastics and paints, along with other materials, as aastm for growth.
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 g21–09, or because the color of the spores are similar to those of the test specimen. To assess materials other than plastics, use of this test method should be agreed upon by all parties involved.
Contamination can have a negative effect on the test results since it could easily provide nutrients to the fungus for growth. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The fungus results are usually determined and recorded as a growth rating: Many products that operate in warm, humid environments must be tested to withstand fungal attacks, since this problem can cause myriad of operational challenges.
If the document is revised or amended, you will be notified by email. You may delete a document from your Alert Profile at any time. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. In order to minimize contamination, good practices include not removing the test specimens from the packaging until it is time for inoculation.
Spores are grown for g210-9 2 — 3 weeks, followed by inoculation g2-109 the spore suspension the combined spores that are selected for testing and placed in a test chamber for 28 days or as specified. Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods.
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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. Already Subscribed to this document. The inch-pound units given in parentheses are for information only. Other effects include preferential growth caused by nonuniform dispersion of plasticizers, lubricants, and other processing additives.
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The inch-pound units given in parentheses are for information only. 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.
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.
It is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, that are responsible for fungus attack on plastic materials.
Attack on these materials often leaves ionized conducting paths. Need more than one copy?