ASTM G21-09 PDF

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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Your Alert Profile lists the documents that will be monitored. Asym is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, that are responsible for fungus attack on plastic materials. If the sample appears to be absent of growth magnifications upwards of 50x, it should be used asfm verify that no growth exists.

Add to Alert PDF. Attack on these materials often leaves ionized conducting paths. Need more than one copy?

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It is the responsibility of the user of this astmm to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The fungus results are usually determined and recorded as a growth rating:. The inch-pound units given in parentheses are for information only.

Webprint Printed and bound. The inch-pound units g211-09 in parentheses are for information only. We have no amendments or corrections for this standard. NOK 1 ,00 excl. If the document is revised or amended, you will be notified g2-109 email. This service is not available if you are a URL user where you do not log in with an email address. Historical Version s – view previous versions of standard.

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. Please first log in with a verified email before subscribing to alerts.

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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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.

Please first verify your email before subscribing to alerts. NTS engineers are extremely careful handling samples for fungus testing, as the cleanliness of the specimens is aetm prior to testing — especially testing astj conducted on a cleaning or decontamination process.

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t21-09

ASTM G21:09

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

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. Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. t21-09

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There could be fungal spores on the gg21-09 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. To ensure that estimates of behavior are not too optimistic, the greatest observed degree of deterioration should be reported.

ASTM G21 – National Technical Systems

Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. Link to Active This link will always route to the h21-09 Active version of the standard. Contamination can have a negative effect on the test results since it could easily provide nutrients to the fungus for growth.

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Read more about subscriptions. If handling is necessary gloves, should be worn 2g1-09 handling test specimens. Breaching protective covers to mar the appearance g21-099 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.

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The test can reveal if the specimen being analyzed supplies sufficient nutrition for xstm growth. The fungus results are usually determined and recorded as a growth rating: 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.

This standard is also available to be included in Standards Subscriptions. 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. 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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