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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You need to log in before adding standards to the monitoring service. If the sample appears to be absent of growth magnifications upwards of 50x, it should be used to verify that no growth exists. In order to minimize contamination, good practices include not removing the test specimens from the packaging until it is time for inoculation. 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.
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. Other effects include preferential growth caused by nonuniform dispersion of plasticizers, lubricants, and other processing additives. Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods.
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. It is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, that are responsible for fungus attack on plastic materials.
Determination of these effects is not covered in this practice. The fungus results are usually determined and recorded as a growth rating: 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 f21-09.
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If the document is revised or amended, you will be notified by email. To zstm degrees, live fungi will use wood, paper, leather, hydrocarbons, PVC, polyurethanes, certain plastics and paints, along with other materials, as fuel for growth.
Changes in optical, mechanical, and electrical properties may be determined g2-109 the applicable ASTM methods. Already Subscribed to this document. 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 test specimen, such as changes in appearance, or in mechanical and electrical properties. 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.
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Historical Version s – view previous versions of standard. 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. The benefits of g2-09 subscription: Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
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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Types of Fungal Attacks Fungus can disrupt systems and cause damage in several ways, including: 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:. Read more about subscriptions. As the voice of the U. ashm
ASTM G21 – National Technical Systems
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To ensure that estimates of behavior are not too optimistic, the greatest observed degree of deterioration should be reported. Start Webshop Product catalog Product presentation.
There could 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 spores are similar to those of the test specimen. If handling is necessary gloves, should be worn while handling test specimens.
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. Your Alert Ast lists g1-09 documents that will be monitored.
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. Webprint Printed and bound. You may delete a document from your Alert Profile at any time.
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