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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Already Subscribed to this document. Other effects include preferential growth caused by nonuniform dispersion of plasticizers, lubricants, and other processing additives.
If the document is revised or amended, you will be notified 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.
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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.
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It is generally the other components, such as asfm, cellulosics, lubricants, stabilizers, and colorants, that are responsible for fungus attack on plastic materials. NOK 1 ,00 excl. Add to Alert PDF. A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition.
ASTM G21 – National Technical Systems
If handling is necessary gloves, should be worn while handling test specimens. As the voice of the U. This standard is also available to be included in Standards Subscriptions.
It can also show, for long test durations, the effects fungus may have on g21-009 test specimen, such as changes in appearance, or in mechanical and electrical properties. Subscription pricing is determined by: The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email.
Proceed to Checkout Asstm Shopping. 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.
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.
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. Types of Fungal Attacks Fungus can disrupt systems and cause damage in several ways, including: Need more than one copy?
We have no amendments or corrections for this standard. 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.
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Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. 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. This standard is not included in any packages. The fungus results are usually determined and recorded atm a growth rating:.
To ensure that estimates of behavior are not too optimistic, the greatest observed degree of deterioration should be reported. The inch-pound units given in parentheses are for information only. You may delete a document from your Alert Profile at any time. Webprint Printed and bound.