ASTM G29-21 测定聚合物薄膜耐蓝藻性的标准实施规程.pdf

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards Guides and Remendations issued by the World Trade Organization Technical Barriers to Trade (TBT)Committee. Designation:G29-21 INTERNATIONAL Standard Practice for Determining Cyanobacterial Resistance of Polymeric Films1 This standard is issued under the fixed designation G29:the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision.A number in parentheses indicates the year of last reapproval.A superseript epsilon (s)indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the U.S.Department of Defense. 1.Scope films.Cyanobacteria tend to grow in such bodies of water 1.1 This practice covers the determination of the suscepti- under the proper atmospheric conditions and they can produce bility of polymeric films to the attachment and proliferation of slimy and unsightly deposits on the film.The method described surface-growing cyanobacteria. herein is useful in evaluating the degree and permanency of protection against surface growth of cyanobacteria afforded by 1.2 Units-The values stated in SI units are to be regarded various additives incorporated in the film. as standard.The values given in parentheses after SI units a...