ASTM E1945-21

Standard Test Method for Percent Dispersibility

SIGNIFICANCE AND USE
4.1 This test method is designed specifically for dry formulations.  
4.2 This test method may not be applicable to all dry formulations such as those containing water soluble or liquid technicals/pesticides or ingredients that rise to the top upon separation.  
4.3 This test method may not be applicable to those technicals that decompose below the drying temperature.  
4.4 This test method should be run in duplicate.  
4.5 Products containing water soluble or volatile components may result in errors.
SCOPE
1.1 This test method is used to determine the percent dispersibility of dry pesticide formulations.  
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 appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  For specific precautionary statements see Section 7.  
1.4 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 Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Sep-2021
• ICS: 13.080.01 - Soil quality and pedology in general
• Technical Committee: E35 - Pesticides, Antimicrobials, and Alternative Control Agents
• Drafting Committee: E35.22 - Pesticide Formulations and Delivery Systems

Standards Content (Sample)

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 Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E1945 − 21
Standard Test Method for
1
Percent Dispersibility
This standard is issued under the fixed designation E1945; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method is used to determine the percent 4.1 This test method is designed specifically for dry formu-
dispersibility of dry pesticide formulations. lations.
4.2 This test method may not be applicable to all dry
1.2 The values stated in SI units are to be regarded as
formulations such as those containing water soluble or liquid
standard. No other units of measurement are included in this
technicals/pesticides or ingredients that rise to the top upon
standard.
separation.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4.3 This test method may not be applicable to those tech-
responsibility of the user of this standard to establish appro- nicals that decompose below the drying temperature.
priate safety, health, and environmental practices and deter-
4.4 This test method should be run in duplicate.
mine the applicability of regulatory limitations prior to use.
4.5 Products containing water soluble or volatile compo-
For specific precautionary statements see Section 7.
nents may result in errors.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5. Apparatus
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5.1 Balance, top loading, with an accuracy of 60.01 g or
mendations issued by the World Trade Organization Technical
better.
Barriers to Trade (TBT) Committee.
5.2 Gravity Oven.
5.3 Weighing Dish, 150 mL capacity or greater.
2. Referenced Documents
2
5.4 Vacuum Apparatus, see Fig. 1, equipped with a vented
2.1 ASTM Standards:
stopper.
D1126Test Method for Hardness in Water
D1193Specification for Reagent Water
5.5 Mixing Cylinder, stoppered, 250mL, flat bottom.
5.6 Timer, adjustable, with an accuracy of 61s.
3. Summary of Test Method
5.7 Weighing Dish, aluminum (57 × 18 mm) or petri dish or
3.1 A known amount of dry pesticide formulation is added
equivalent.
toa250mLmixingcylinderthathasbeenfilledtovolumewith
5.8 Filtering Flask, heavy wall, 500 mL.
standard water. The mixing cylinder is then stoppered and
inverted 30 times in 2 min. The mixing cylinder is allowed to
6. Reagents (Test Water)
stand for 1 min.After 1 min, the top 225 mL is drawn off and
the remaining suspension is dried. The residue weight will
6.1 Purity of Reagents—Reagent grade chemicals shall be
determine percent dispersibility.
used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit-
tee onAnalytical Reagents of theAmerican Chemical Society
3
where such specifications are available.
1
This test method is under the jurisdiction of ASTM Committee E35 on
Pesticides, Antimicrobials, and Alternative Control Agents and is direct responsi-
bility of Subcommittee E35.22 on Pesticide Formulations and Delivery Systems
Current edition approved Oct. 1, 2021. Published November 2021. Originally
3
approved in 1998. Last previous edition approved in 2016 as E1945–02(2016). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/E1945-21. Chemical Society, Washington, DC. For Suggestions on the testing of reagents not
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Annual Standards for Laboratory
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
the ASTM website. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E1945 − 21
method is provided in Test Method D1126 where the value is represented
as CaCO . A value within 65% of the nominal hardness value is
3
acceptable.
6.3.2 Hard Water, equivalent to a total hardness of 342 ppm
as calcium carbonate (CaCO ). Transfer 25.0 mL of synthetic
3
hardwaterstockbyburettoa1000mLvolumetricflask
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E1945 − 02 (Reapproved 2016) E1945 − 21
Standard Test Method for
1
Percent Dispersibility
This standard is issued under the fixed designation E1945; 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
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method is used to determine the percent dispersibility of dry pesticide formulations.
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 appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. For specific precautionary statements see Section 7.
1.4 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 Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D1126 Test Method for Hardness in Water
D1193 Specification for Reagent Water
3. Summary of Test Method
3.1 A known amount of dry pesticide formulation is added to a 250-mL250 mL mixing cylinder that has been filled to volume with
standard water. The mixing cylinder is then stoppered and inverted 30 times in 2 min. The mixing cylinder is allowed to stand for
1 min. After 1 min, the top 225 mL is drawn off and the remaining suspension is dried. The residue weight will determine percent
dispersibility.
4. Significance and Use
4.1 This test method is designed specifically for dry formulations.
4.2 This test method may not be applicable to all dry formulations such as those containing either liquid technicalswater soluble
or liquid technicals/pesticides or ingredients that rise to the top upon separation.
1
This test method is under the jurisdiction of ASTM Committee E35 on Pesticides, Antimicrobials, and Alternative Control Agents and is direct responsibility of
Subcommittee E35.22 on Pesticide Formulations and Delivery Systems
Current edition approved Nov. 1, 2016Oct. 1, 2021. Published November 2016November 2021. Originally approved in 1998. Last previous edition approved in 20082016
as E1945 – 02(2008).(2016). DOI: 10.1520/E1945-02R16.10.1520/E1945-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1945 − 21
4.3 This test method may not be applicable to those technicals that decompose below the drying temperature.
4.4 This test method should be run in duplicate.
4.5 Products containing water soluble or volatile components may result in errors.
5. Apparatus
5.1 Balance, top loading, with an accuracy of 60.01 g or better.
5.2 Gravity Oven.
5.3 Weighing Dish, 150 mL capacity or greater.
5.4 Vacuum Apparatus, see Fig. 1, equipped with a vented stopper.
5.5 Mixing Cylinder, stoppered, 250-mL,250 mL, flat bottom.
5.6 Timer, adjustable, with an accuracy of 61 s.
5.7 Weighing Dish, aluminum (57 × 18 mm) or petri dish or equivalent.
FIG. 1 Vacuum Apparatus
2

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E1945 − 21
5.8 Filtering Flask, heavy wall, 500 mL.
6. Reagents (Test Water)
6.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society where
3
such specifications are available.
6.2 Purity of Water—Unless otherwise indicated, reference to water shall be understood to mean reagent water, Type IV, as defined
by Specification D1193.
NOTE 1—Type IV grade reagent water may be prepared by distillation, ion exchange, reverse osmosis, electrodialysis, or a combination thereof.
6.3 Synthetic Hard Water Stock, transfer 12.14 g of
...