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ASTM E171-11(R2020) pdf free download

ASTM E171-11(R2020) pdf free download.Standard Practice for Conditioning and Testing Flexible Barrier Packaging
1. Scope
1.1 This practice defines the standard temperature and humidity for conditioning and testing of flexible barrier pack- aging and flexible barrier packaging materials at nominally ambient conditions. 1.2 There are many other temperature and humidity condi- tions that may be appropriately used to test end use conditions (such as freezer, refrigerated, or abusive storage). These need to be individually established and are not in the scope of this practice. 1.3 Only those materials that fall under the general area of flexible barrier packaging materials are included in this prac- tice. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 conditioning—the exposure of a material to the influ- ence of a prescribed atmosphere for a stipulated period of time or until a stipulated relation is reached between material and atmosphere. 3.2 Terms and definitions used in this practice may be found in Terminology F17.
4. Significance and Use
4.1 Conditioning is used to minimize the variation in test results that may result from fluctuations in temperature and humidity, or both. Many flexible packaging materials or components of flexible packaging materials, particularly ma- terials that are hygroscopic, undergo changes in physical properties as the temperature and the relative humidity (RH) to which they are exposed are varied. 4.2 Many packaging materials do not exhibit a meaningful change in physical properties across the temperature and humidity range that is generally found in office and general laboratory settings. As a result, conditioning ofsamples is often not required in order to achieve useful test results and is often bypassed during routine testing. 4.3 Conditioning should be considered when (a) comparing between or among laboratory results (for example, supplier and customer), (b) temperature or humidity is anticipated to have an effect on the test outcomes, or (c) potential sources of variation in test results must be minimized. 4.4 Temperature and humidity alone are not sufficient to completely define a storage condition. Many other factors may be relevant (such as time, light, and atmospheric pressure) that are not defined in this specification.
5. Atmospheric Conditions
5.2 Special Atmospheres—If special atmospheres are required, see Practice D4332 for guidance on temperature and relative humidity associated with specific environmental con- ditions. A conditioning time of 24 h minimum at the special atmosphere shall be used unless circumstances suggest another time may be more appropriate. The special atmospheres listed in Practice D4332 are not intended to be performed in sequence. Practice F2825 provides guidance on climatic stress- ing protocols.
6. Keywords
6.1 conditioning; conditions; flexible packaging; flexible barrier packaging; materials; package

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