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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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ASTM G21 – National Technical Systems

It is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, asgm are responsible for fungus attack on plastic materials. Determination of these effects is not covered in this practice.

Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. The moment new editions of the standards you sstm are released, changes are made, or appendixes are published, you will be alerted by email. NTS engineers are extremely careful handling samples for fungus asstm, as the cleanliness of the specimens is important prior to testing — especially testing being conducted on a cleaning or decontamination process.

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. Monitoring Standards monitoring is a free service designed for you who wish to be alerted adtm changes to or new editions of the standards required in your work. 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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Other effects include asm growth caused by nonuniform dispersion of plasticizers, lubricants, and other processing additives. 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.

Need more than one copy? Asfm Version s – view previous versions of standard. Many products that operate in warm, humid environments must be tested to withstand fungal attacks, since this problem can cause myriad of operational challenges.

Read more about subscriptions. Link to Active This link will always route to the current Active version of the standard.

The test can reveal if the specimen being analyzed supplies sufficient nutrition for fungal growth. This service is not available if you are a URL user where you do not log in with an email address.

To ensure that estimates of behavior are not too optimistic, the greatest observed degree of deterioration should be reported. Subscription pricing is determined by: This standard is also available to be included in Standards Subscriptions.

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. If the document is revised or amended, you will be notified by email.

As the voice of the U. Types of Fungal Attacks Fungus can disrupt systems and cause damage in several ways, including: Contamination can have a negative effect on the test results since it could easily provide nutrients to the fungus for growth. We have no amendments or corrections for this standard.

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This standard is not included in any packages. If the sample appears to be absent of growth magnifications upwards of 50x, it should be used to verify that no growth exists.

ASTM G21:09

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. It can also show, for long test durations, the effects fungus may have on the axtm specimen, such as changes in appearance, or in mechanical and electrical properties. The inch-pound units given in parentheses are for information only. Already Subscribed to this document. 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.

A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition.

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

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