ASTM E1673-21

Standard Test Method for Percent Suspensibility

SIGNIFICANCE AND USE
4.1 This test method is designed specifically for dry formulations, but need not be restricted to these materials.  
4.2 Either option of this test method (see Section 8) may be used to determine the percent suspensibility.  
4.3 This test method may not be applicable to all dry formulations such as those containing liquid or soluble technical/pesticides or ingredients that rise to the top upon separation.  
4.4 This test method may not be applicable to formulations containing ingredients that decompose under the test conditions.  
4.5 This test method may not give reproducible results if flocculation occurs.  
4.6 This test method should be run in duplicate.  
4.7 Products containing water soluble or volatile components may result in errors.
SCOPE
1.1 This test method is used to determine the percent suspensibility 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: 65.100.01 - Pesticides and other agrochemicals 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: E1673 − 21
Standard Test Method for
1
Percent Suspensibility
This standard is issued under the fixed designation E1673; 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 isdrawnoffandtheremainingsuspensionisdried.Theresidue
weight will determine the percent suspensibility.
1.1 This test method is used to determine the percent
suspensibility of dry pesticide formulations.
4. Significance and Use
1.2 The values stated in SI units are to be regarded as
4.1 This test method is designed specifically for dry
standard. No other units of measurement are included in this
formulations, but need not be restricted to these materials.
standard.
4.2 Either option of this test method (see Section 8) may be
1.3 This standard does not purport to address all of the
used to determine the percent suspensibility.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.3 This test method may not be applicable to all dry
priate safety, health, and environmental practices and deter-
formulations such as those containing liquid or soluble
mine the applicability of regulatory limitations prior to use.
technical/pesticides or ingredients that rise to the top upon
For specific precautionary statements see Section 7.
separation.
1.4 This international standard was developed in accor-
4.4 This test method may not be applicable to formulations
dance with internationally recognized principles on standard-
containing ingredients that decompose under the test condi-
ization established in the Decision on Principles for the
tions.
Development of International Standards, Guides and Recom-
4.5 This test method may not give reproducible results if
mendations issued by the World Trade Organization Technical
flocculation occurs.
Barriers to Trade (TBT) Committee.
4.6 This test method should be run in duplicate.
2. Referenced Documents
4.7 Products containing water soluble or volatile compo-
2
2.1 ASTM Standards:
nents may result in errors.
D1126Test Method for Hardness in Water
D1193Specification for Reagent Water
5. Apparatus
5.1 Balance, top loading, with an accuracy of 60.01 g or
3. Summary of Test Method
better.
3.1 Aknownquantityofdrypesticideisslurriedinto50mL
5.2 Beaker, 100 mL.
of test water in a 100mL beaker. The slurry is quantitatively
transferred to a 250mL mixing cylinder using additional test
5.3 Mixing Cylinder, stoppered, 250 mL, flat bottom, KI-
water to rinse the beaker. The 250mL mixing cylinder is then
MAX series 20039 or equivalent.
filled to volume with test water. The mixing cylinder is
5.4 Timer, adjustable, with an accuracy of 6 min.
stoppered and inverted 15 complete cycles. The mixing cylin-
derisallowedtostandfor30min.After30minthetop225mL 5.5 Magnetic Stirrer, 120 rpm to 1200 rpm, or equivalent.
3
5.6 Stir Bar, magnetic 1 in. in length and ⁄8 in. in diameter
(2.5 cm×1 cm).
1
This test method is under the jurisdiction of ASTM Committee E35 on
5.7 Weighing Dish, aluminum (57mm×18 mm) or petri
Pesticides, Antimicrobials, and Alternative Control Agents and is the direct
responsibility of Subcommittee E35.22 on Pesticide Formulations and Delivery
dish, or equivalent.
Systems.
Current edition approved Oct. 1, 2021. Published November 2021. Originally 5.8 Vacuum Apparatus, see Fig. 1, equipped with a vented
approved in 1995. Last previous edition approved in 2017 as E1673–96 (2017).
stopper to prevent the formation of a vacuum.
DOI: 10.1520/E1673-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 5.9 Filtering Flask, heavy wall, 500 mL, KIMAX Series
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
27060 or equivalent.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 5.10 Gravity Oven.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E1673 − 21
flask. Dissolve the reagents with approximately 750 mL of
water and equilibrate to 20°C. Dilute the solution to 1000 mL
total volume with water at 20°C, stopper the flask and mix the
solution thoroughly. This mixture is equivalent to 13680 ppm
ascalciumcarbonate(CaCO )andisbasedonacompositional
3
ratio of 4:1 calcium carbonate to magnesium carbonate.
6.3.1 Soft Water—Equivalenttoatotalhardnessof34.2ppm
as calcium carbonate
...

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: E1673 − 96 (Reapproved 2017) E1673 − 21
Standard Test Method for
1
Percent Suspensibility
This standard is issued under the fixed designation E1673; 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 suspensibility 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 quantity of dry pesticide is slurried into 50 mL of test water in a 100-mL100 mL beaker. The slurry is quantitatively
transferred to a 250-mL250 mL mixing cylinder using additional test water to rinse the beaker. The 250-mL250 mL mixing
cylinder is then filled to volume with test water. The mixing cylinder is stoppered and inverted 15 complete cycles. The mixing
cylinder is allowed to stand for 30 min. After 30 min the top 225 mL is drawn off and the remaining suspension is dried. The residue
weight will determine the percent suspensibility.
4. Significance and Use
4.1 This test method is designed specifically for dry formulations, but need not be restricted to these materials.
4.2 Either option of this test method (see Section 8) may be used to determine the percent suspensibility.
1
This test method is under the jurisdiction of ASTM Committee E35 on Pesticides, Antimicrobials, and Alternative Control Agents and is the direct responsibility of
Subcommittee E35.22 on Pesticide Formulations and Delivery Systems.
Current edition approved April 1, 2017Oct. 1, 2021. Published April 2017November 2021. Originally approved in 1995. Last previous edition approved in 20122017 as
E1673 – 96 (2012).(2017). DOI: 10.1520/E1673-96R17.10.1520/E1673-21.
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 ----------------------
E1673 − 21
4.3 This test method may not be applicable to all dry formulations such as those containing either liquids or liquid or soluble
technical/pesticides or ingredients that rise to the top upon separation.
4.4 This test method may not be applicable to formulations containing ingredients that decompose under the test conditions.
4.5 This test method may not give reproducible results if flocculation occurs.
4.6 This test method should be run in duplicate.
4.7 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 Beaker, 100 mL.
5.3 Mixing Cylinder, stoppered, 250 mL, flat bottom, KIMAX series 20039 or equivalent.
5.4 Timer, adjustable, with an accuracy of 6 min.
5.5 Magnetic Stirrer, 120 rpm to 1200 rpm, or equivalent.
3
5.6 Stir Bar, magnetic 1 in. in length and ⁄8 in. in diameter (2.5 cm × 1 cm).
5.7 Weighing Dish, aluminum (57 × 18(57 mm × 18 mm) or petri dish, or equivalent.
5.8 Vacuum Apparatus, see Fig. 1, equipped with a vented stopper to prevent the formation of a vacuum.
5.9 Filtering Flask, heavy wall, 500 mL, KIMAX Series 27060 or equivalent.
5.10 Gravity Oven.
5.11 Centrifuge, any centrifuge capable of holding a 50 mL or larger tube and maintaining a minimum speed of 1500 rpm.
5.12 Centrif
...