ASTM E726-01(R2021) pdf free download

ASTM E726-01(R2021) pdf free download.Standard Test Method for Particle Size Distribution of Granular Carriers and Granular Pesticides
1. Scope
1.1 This test method is used to determine the particle size distribution of granular carriers and granular pesticides. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 6. 1.4 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. Summary of Test Method
3.1 A known weight of the granular carrier or granular pesticide is placed on the top sieve of a stacked set of U.S. standard sieves and shaken under standard conditions for a specified period of time. The weight percent of the granules retained on each sieve and the bottom pan is determined.
4. Significance and Use
4.1 This procedure was designed principally for clay, corncob, nut shell, paper, or sand granular carriers and granular pesticide products, but need not be limited to these materials. There may be more appropriate test methods for other types of granular carriers and products.
5. Apparatus
5.1 Brushes; Tyler Part No. 8576 soft brass wire brush, or equivalent, for 100 mesh (150 µm) and coarser sieves. Tyler nylon bristle brush (Part No. 8577), or equivalent, for screens finer than 100 mesh. 5.2 Mechanical Sieve Shaker; a Tyler RoTap sieve shaker, or equivalent, or other agreed upon device. 5.3 Sieves; U.S. standard 8 in. (20.3 cm) diameter sieves, or equivalent, conforming to Specification E11. 5.4 Bottom Receiver Pan and Top Sieve Cover. 5.5 Interval Timer; adjustable, with an accuracy of 610 s. 5.6 Balance; sensitivity of 0.1 g.
6. Hazards
6.1 Before testing, read the precautionary statements on the product label, and the Material Safety Data Sheet, or both. Take proper precautions to prevent skin contact and inhalation ofthe fines, or the vapors, or both. Take care to prevent contamina- tion of the surrounding area. Always wear the appropriate safety equipment and, where indicated, wear respiratory de- vices approved by NIOSH for the product being tested.
7. Procedure
7.1 Clean and stack the specified sieves in order ofsize with the pan on the bottom, and the sieve with the largest mesh on the top. 7.2 Use a representative sample of approximately 100 6 5 g as defined in Test Method E725. 7.3 Weigh the sample to 60.1 g.7.4 Transfer the whole weighed fraction onto the top sieve, cover and shake for the time given in the product specification or 10 min if time is not specified. 7.5 Remove the sieve assembly from the sieve shaker and, using the brush, quantitatively transfer the granular material on the top sieve to a tared weighing pan and weigh to the nearest 0.1 g. Record the value as the sieve fraction weight for that sieve. Repeat this procedure for material retained on each sieve and the bottom receiver pan. 7.6 Determine the distribution on duplicate samples.
9. Precision and Bias
9.1 This procedure yields comparative data. The pass/fail aspect of the test should be determined by applicable specifi- cations. When used for specification purposes, the mechanical shaker and test conditions must be agreed upon.
10. Disposal of Sample
10.1 After testing, store all materials in a safe manner and dispose of used material in accordance with product label directions, or the Material Safety Data Sheets, or both.