Actions for Development of an ASTM Method for Measurement of the Extensional Viscosity of Agricultural Spray Solutions

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Development of an ASTM Method for Measurement of the Extensional Viscosity of Agricultural Spray Solutions / Robin W. Dexter

Conference Author
Pesticide Formulations & Delivery Systems, 26th Volume: Reassessing Pesticide Technologies (26th : 2005 : Dallas, Texas)
Physical Description
1 online resource (8 pages) : illustrations, figures, tables
Additional Creators
Dexter, Robin W., American Society for Testing and Materials, and ASTM International
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Summary
Polymeric drift control agents are used to modify the droplet size distribution of pesticide sprays. These agents function by increasing the extensional viscosity of the spray liquid, enabling it to resist disruption as it emerges from the spray nozzle, usually leading to an increase in the median droplet diameter of the spray droplets. Extensional viscosity is often the most important physical property controlling the spray droplet size, especially when soluble polymers are present, but methods available for measurement of extensional viscosity of dilute solutions are complicated and are not generally available. This paper describes a simple, portable apparatus that can detect and quantify a relative extensional viscosity (screen factor) that is useful in evaluating the properties of drift control agents. The apparatus has been used to determine the screen factors of test substances used by the Spray Drift Task Force and to correlate them with independent measurements of extensional viscosity obtained using a Rheometrics RFX Extensional Rheometer. The method has been adopted as ASTM Method E 2408-04, ¿̐ưRelative Extensional Viscosity of Agricultural Spray Tank Mixes.¿̐ư.
Dates of Publication and/or Sequential Designation
Volume 2008, Issue 1478 (January 2008)
Subject(s)
Other Subject(s)
ISBN
9780803167346 (e-ISBN)
9780803134034
0803134037
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 4.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2008. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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