ASTM G21-09 PDF

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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NOK 1 ,00 excl. Contamination can have a negative effect on the test results since it could easily provide nutrients to the fungus for growth.

Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. You may delete a document from your Alert Profile at any time. 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 moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email. Breaching protective covers to mar the appearance and degrade the optical capabilities of your product Shedding metabolic waste products that cause corrosion or etching Prompting electrical systems to develop undesirable conducting paths Blocking delicate moving parts Introducing internal moisture, which can affect system performance Fungus Testing 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.

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. As the voice of the U. Standards Subsctiption may be the perfect solution.

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You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Determination of these effects is not covered in this practice.

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ASTM G21 – National Technical Systems

This standard is not included in any packages. This service is not available if you are a URL user where you do not log in with an email address. 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.

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.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. You need to log in before adding standards to the monitoring service. If the samples are mishandled or suspected of contamination prior to testing, they should be cleaned, Testing cannot be conducted on specimens until 72 hours have passed.

Other effects include preferential asttm caused by nonuniform dispersion of plasticizers, lubricants, and other processing additives. 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.

To assess materials other than plastics, use of this test method should be agreed upon by all parties involved.

Add to Alert PDF. In order to minimize contamination, good practices include not removing the test h21-09 from the packaging until it is time for inoculation. Attack on these materials often leaves ionized conducting paths.

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The benefits of a subscription: It is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, that are responsible aastm fungus attack on plastic materials.

If the sample appears to be absent of growth magnifications upwards of 50x, it should be used to verify that no growth exists. Start Webshop Product catalog Product presentation. A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. 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.

Pronounced physical changes are observed on products in film form or as coatings, where the ratio ashm surface to volume is high, and sstm nutrient materials such as plasticizers and lubricants continue to diffuse to the surface as they are utilized by the organisms. Read more about subscriptions. To ensure that estimates of behavior are not too optimistic, the greatest observed degree of deterioration should be reported.

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ASTM G21:09

If handling is necessary gloves, should be worn while handling test specimens. 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.

The inch-pound units given in parentheses are for information only.