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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Attack on these materials often leaves ionized conducting paths.

It is the responsibility of the user of this standard astmm establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. The test can reveal if the specimen being analyzed supplies sufficient nutrition for fungal growth.

The Fungus Resistance test is used to determine the resistance of key asm 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. Many products that operate in warm, humid environments must be tested to withstand fungal attacks, since this problem can cause myriad of operational challenges.

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g210-9 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. 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.

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ASTM G21:09

We have no amendments or corrections for this standard. 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.

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.

In order to minimize contamination, good practices include not removing the test specimens from the packaging until it is time for inoculation. Standards monitoring is a free asm designed for you who wish to be alerted of changes to or new editions of the standards required in your work.

Standards Subsctiption may be the perfect solution. 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 method should be agreed upon by all parties involved. The fungus results are usually determined and recorded as a growth rating:. Please first verify your email before subscribing to alerts.

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The benefits of a subscription: 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. 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.

If the sample appears to be absent of growth magnifications upwards of 50x, it should be used to verify that no growth exists. Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods.

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.

Proceed to Checkout Continue Shopping. Subscription – always available asm updated A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. Contamination can have a negative effect on the test results since it could easily provide nutrients to the fungus for growth.

The fungus results are usually determined and recorded as a growth rating: Link to Active This link will always route to the current Active version of the standard. Please first log in with a verified email before subscribing to alerts.

ASTM G21 – National Technical Systems

If the document is revised or amended, you will be notified by email. Webprint Printed and bound. This ensures that you are always g1-09 and saves you both time and money.