ASTM E1945-02(2008)

Standard Test Method for Percent Dispersibility

SIGNIFICANCE AND USE
This test method is designed specifically for dry formulations.
This test method may not be applicable to all dry formulations such as those containing either liquid technicals or ingredients that rise to the top upon separation.
This test method may not be applicable to those technicals that decompose below the drying temperature.
This test method should be run in duplicate.
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 and health practices and determine the applicability of regulatory limitations prior to use.  For specific precautionary statements see Section 7.

General Information

• Status: Historical
• Publication Date: 30-Sep-2008
• 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

Relations

• Replaces: ASTM E1945-02 - Standard Test Method for Percent Dispersibility
• Effective Date: 01-Oct-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E1945 − 02(Reapproved 2008)
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 4.3 This test method may not be applicable to those tech-
nicals that decompose below the drying temperature.
1.1 This test method is used to determine the percent
dispersibility of dry pesticide formulations. 4.4 This test method should be run in duplicate.
1.2 The values stated in SI units are to be regarded as 4.5 Products containing water soluble or volatile compo-
standard. No other units of measurement are included in this nents may result in errors.
standard.
5. Apparatus
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 5.1 Balance, top loading, with an accuracy of 60.01 g or
responsibility of the user of this standard to establish appro- better.
priate safety and health practices and determine the applica-
5.2 Gravity Oven.
bility of regulatory limitations prior to use. For specific
5.3 Weighing Dish, 150 mL capacity or greater.
precautionary statements see Section 7.
5.4 Vacuum Apparatus, see Fig. 1, equipped with a vented
2. Referenced Documents
stopper.
2
2.1 ASTM Standards:
5.5 Mixing Cylinder, stoppered, 250-mL, flat bottom.
D1126Test Method for Hardness in Water
5.6 Timer, adjustable, with an accuracy of 61s.
D1193Specification for Reagent Water
5.7 Weighing Dish, aluminum (57 × 18 mm) or petri dish or
3. Summary of Test Method
equivalent.
3.1 A known amount of dry pesticide formulation is added
5.8 Filtering Flask, heavy wall, 500 mL.
to a 250-mL mixing cylinder that has been filled to volume
withstandardwater.Themixingcylinderisthenstopperedand 6. Reagents (Test Water)
inverted 30 times in 2 min. The mixing cylinder is allowed to
6.1 Purity of Reagents—Reagent grade chemicals shall be
stand for 1 min.After 1 min, the top 225 mL is drawn off and
used in all tests. Unless otherwise indicated, it is intended that
the remaining suspension is dried. The residue weight will
all reagents shall conform to the specifications of the Commit-
determine percent dispersibility.
tee onAnalytical Reagents of theAmerican Chemical Society
3
where such specifications are available.
4. Significance and Use
6.2 Purity of Water—Unless otherwise indicated, reference
4.1 This test method is designed specifically for dry formu-
towatershallbeunderstoodtomeanreagentwater,TypeIV,as
lations.
defined by Specification D1193.
4.2 This test method may not be applicable to all dry
NOTE 1—Type IV grade reagent water may be prepared by distillation,
formulations such as those containing either liquid technicals
ion exchange, reverse osmosis, electrodialysis, or a combination thereof.
or ingredients that rise to the top upon separation.
6.3 Synthetic Hard Water Stock, transfer 12.14 g of anhy-
drous calcium chloride (CaCl ) and 5.55 g of magnesium
2
1
This test method is under the jurisdiction of ASTM Committee E35 on
chloride hexahydrate (MgCl •6H O) to a 1000-mLvolumetric
2 2
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, 2008. Published November 2008. Originally
3
approved in 1998. Last previous edition approved in 2002 as E1945–02. DOI: Reagent Chemicals, American Chemical Society Specifications, American
10.1520/E1945-02R08. 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

---------------------- Page: 1 ----------------------
E1945 − 02 (2008)
6.3.3 Extra-hard Water, equivalent to a total hardness of
1000 ppm as calcium carbonate (CaCO ).Transfer 73.1 mLof
3
synthetic hard water stock by buret to a 1000-mL volumetric
flaskanddilutetovolumewithwaterat20°C.Mixthissolution
thoroughly (see Note 2).
6.3.4 Other Test Waters—Other synthetic waters can be
prepared by using the following calculation
...

This document is not anASTM standard and is intended only to provide the user of anASTM 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:E1945–98 Designation: E 1945 – 02 (Reapproved 2008)
Standard Test Method for
1
Percent Dispersibility
This standard is issued under the fixed designation E 1945; 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
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 and health practices and determine the applicability of regulatory
limitations prior to use. For specific precautionary statements see Section 7.
2. Referenced Documents
2
2.1 ASTM Standards:
D 1126 Test Method for Hardness in Water
D 1193 Specification for Reagent Water
3. Summary of Test Method
3.1 A known amount of dry pesticide formulation is added to a 250-mL mixing cylinder that has been filled to volume with
standard water.The mixing cylinder is then stoppered and inverted 30 times in two minutes.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 Thistestmethodmaynotbeapplicabletoalldryformulationssuchasthosecontainingeitherliquidtechnicalsoringredients
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.
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, flat bottom, KIMAX series 20 039 or equivalent. , stoppered, 250-mL, flat bottom.
5.6 Timer, adjustable, with an accuracy of 61 second. s.
5.7 Weighing Dish, aluminum (57 3 18 mm) or petri dish or equivalent.
5.8 Filtering Flask, heavy wall, 500 mL, Kimax Series 27 060 or equivalent. , heavy wall, 500 mL.
1
This practice is under the jurisdiction of ASTM Committee E-35 on Pesticides and is direct responsibility of Subcommittee E35.22 on Pesticide Formulation and
Application Systems.
Current edition approved March 10, 1998. Published May 1998.
1
This test method is under the jurisdiction of ASTM Committee E35 on Pesticides and Alternative Control Agents and is direct responsibility of Subcommittee E35.22
on Pesticide Formulations and Delivery Systems
Current edition approved Oct. 1, 2008. Published November 2008. Originally approved in 1998. Last previous edition approved in 2002 as E 1945 – 02.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
, Vol 11.01.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 ----------------------
E 1945 – 02 (2008)
FIG. 1 Vacuum Apparatus
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 D 1193.
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 anhydrous calcium chloride (CaCl ) and 5.55 g of magnesium chloride
2
hexahydrate (MgCl •6H O) to a 1000-mL volumetric flask. Dissolve the reagents with approximately 750 mL of wat
...