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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The benefits of a subscription: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. As the voice of the U.

Other effects include preferential growth caused by nonuniform dispersion of plasticizers, lubricants, and other processing additives. To assess materials other than plastics, use of this test ashm should be agreed upon by all parties involved.

ASTM G21:09

Please first verify your email before subscribing to alerts. The inch-pound units given in parentheses are for information only. 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.

A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. We have no amendments or corrections for this standard.

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.

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NOK 1 ,00 excl. It is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, that are responsible for fungus attack on plastic materials. Link to Active This link will always route to the current Active version of the standard. Types of Fungal Attacks Fungus can disrupt systems and cause damage in several ways, including: 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.

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.

You may delete a document from your Alert Profile at any time. 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.

Start Webshop Product catalog Product presentation. Standards Subsctiption may be the perfect solution. The fungus results are usually determined and recorded as a growth rating: Determination of these effects is not covered in this practice. If the sample appears to be absent of growth magnifications upwards of xstm, it should be used to verify that no growth exists. Historical Version s – view previous versions of standard. Read more about subscriptions.

ASTM G21 – National Technical Systems

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. Already Subscribed to this document. Monitoring 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. There astmm 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 g2109 are similar to those of the test specimen.

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You need to log in before adding standards to the monitoring service. Attack on these materials often leaves ionized conducting paths.

This standard is not included in any packages. 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 ensure that estimates of behavior are not too optimistic, the greatest observed degree of deterioration should be reported. Standards monitoring is a free service designed for you asstm wish to be alerted of changes to or new editions of the standards required in your work.

If handling is necessary gloves, should be worn while handling test specimens. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing atm.

In order to minimize contamination, good practices include not removing the test specimens from the packaging until it is time for inoculation.

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.

Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. Need more than one copy?

Contamination can have a negative effect on the test results since it could easily provide nutrients to the fungus for growth. Your Alert Profile lists the documents that will be monitored.

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