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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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. 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. Many products that y21-09 in warm, humid environments must be tested to withstand fungal attacks, since this problem can cause myriad of operational challenges.
The fungus results are usually determined and recorded as a growth rating:. A web subscription provides an easy and secure access to standards, and g21-009 are guaranteed to always have the latest edition. 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.
Contamination can have a negative effect on the test results since it could easily provide nutrients to the fungus for growth. You need to log in before adding standards to the monitoring service. The inch-pound units given in parentheses are for information only. The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email.
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 ensures that you are always up-to-date and saves you both time and money. The fungus results are usually determined and recorded as a growth rating: As the voice of the U.
If you need to be able to add standards to the monitoring service, you must register as a user with your own username and password. 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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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. Monitoring Standards monitoring is a free service designed for you who wish to be alerted of changes to sstm new editions of the standards required in your work.
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. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Please first log in with a verified email before subscribing to alerts. Other effects include preferential growth caused by nonuniform dispersion of plasticizers, lubricants, and other processing additives. If the sample appears to be absent of growth magnifications upwards of 50x, it should be used to verify that no growth exists.
Add to Alert PDF. Please first verify your email before subscribing to alerts. Subscription pricing is determined by: Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods. Need more than one g210-9
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The test can reveal if the specimen being analyzed supplies sufficient nutrition for fungal growth. To ensure that estimates of behavior are not too optimistic, the greatest observed degree of deterioration should be reported.
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g21–09 Read more about subscriptions. Start Webshop Product catalog Product presentation. In order to minimize contamination, good practices include not removing the test specimens from the packaging until g211-09 is time for inoculation. 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.
It is generally the other components, such as plasticizers, cellulosics, lubricants, stabilizers, and colorants, that are responsible for fungus attack on plastic materials. This standard is not included in any packages. 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.
ASTM G21 – National Technical Systems
Link to Active This link will always route to the current Active version of the standard. The inch-pound units given in parentheses are for information only. 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 benefits of a subscription: 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. Types of Fungal Attacks Fungus can disrupt systems and cause damage in several ways, including: