ASTM E1673-96(2012)

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 either liquids 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 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-2012
• 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

Relations

• Replaces: ASTM E1673-96(2006) - Standard Test Method for Percent Suspensibility
• Effective Date: 01-Oct-2012

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: E1673 − 96 (Reapproved 2012)
Standard Test Method for
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 4.2 Either option of this test method (see Section 8) may be
used to determine the percent suspensibility.
1.1 This test method is used to determine the percent
suspensibility of dry pesticide formulations. 4.3 This test method may not be applicable to all dry
formulations such as those containing either liquids or ingre-
1.2 The values stated in SI units are to be regarded as
dients that rise to the top upon separation.
standard. No other units of measurement are included in this
standard. 4.4 This test method may not be applicable to formulations
containing ingredients that decompose under the test condi-
1.3 This standard does not purport to address all of the
tions.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.5 This test method may not give reproducible results if
priate safety and health practices and determine the applica-
flocculation occurs.
bility of regulatory limitations prior to use. For specific
4.6 This test method should be run in duplicate.
precautionary statements see Section 7.
4.7 Products containing water soluble or volatile compo-
nents may result in errors.
2. Referenced Documents
2.1 ASTM Standards:
5. Apparatus
D1126Test Method for Hardness in Water
5.1 Balance, top loading, with an accuracy of 60.01 g or
D1193Specification for Reagent Water
better.
3. Summary of Test Method
5.2 Beaker, 100 mL.
3.1 Aknownquantityofdrypesticideisslurriedinto50mL
5.3 Mixing Cylinder, stoppered, 250 mL, flat bottom, KI-
of test water in a 100-mL beaker. The slurry is quantitatively
MAX series 20039 or equivalent.
transferred to a 250-mL mixing cylinder using additional test
5.4 Timer, adjustable, with an accuracy of 6 min.
water to rinse the beaker. The 250-mLmixing cylinder is then
filled to volume with test water. The mixing cylinder is
5.5 Magnetic Stirrer, 120 to 1200 rpm, or equivalent.
stoppered and inverted 15 complete cycles. The mixing cylin-
5.6 Stir Bar, magnetic 1 in. in length and ⁄8 in. in diameter
derisallowedtostandfor30min.After30minthetop225mL
(2.5 cm×1 cm).
isdrawnoffandtheremainingsuspensionisdried.Theresidue
5.7 Weighing Dish,aluminum(57×18mm)orpetridish,or
weight will determine the percent suspensibility.
equivalent.
4. Significance and Use
5.8 Vacuum Apparatus, see Fig. 1, equipped with a vented
stopper to prevent the formation of a vacuum.
4.1 This test method is designed specifically for dry
formulations, but need not be restricted to these materials.
5.9 Filtering Flask, heavy wall, 500 mL, KIMAX Series
27060 or equivalent.
5.10 Gravity Oven.
This test method is under the jurisdiction of ASTM Committee E35 on
Pesticides, Antimicrobials, and Alternative Control Agents and is the direct
5.11 Centrifuge, any centrifuge capable of holding a 50 mL
responsibility of Subcommittee E35.22 on Pesticide Formulations and Delivery
or larger tube and maintaining a minimum speed of 1500 rpm.
Systems.
Current edition approved Oct. 1, 2012. Published October 2012. Originally
5.12 Centrifuge Tube, plastic or glass, 50 mL or larger.
approved in 1995. Last previous edition approved in 2006 as E1673–96 (2006).
DOI: 10.1520/E1673-96R12.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Reagents (Test Water)
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.1 Purity of Reagents—Reagent grade chemicals shall be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. used in all tests. Unless otherwise indicated, it is intended that
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E1673 − 96 (2012)
6.3.1 Soft Water—Equivalenttoatotalhardnessof34.2ppm
as calcium carbonate (CaCO ). Transfer 2.50 mL of synthetic
hard water stock by pipet to a 1000-mL volumetric flask and
dilute to volume with water at 20°C. Mix solution thoroughly.
NOTE 2—It is recommended that total hardness be checked in accor-
dance with Test Method MT-73, CIPAC 1, EDTA titration. An alternate
method is provided in Test Method D1126 where the value is represented
as CaCO . A value within 6% of the nominal hardness value is
acceptable.
6.3.2 Hard Water—Equivalent to a total hardness of 342
ppm as calcium carbonate (CaCO ). Transfer 25 mL of
synthetic hard water stock by buret to a 1000-mL volumetric
flaskanddilutetovolumewithwaterat20°C.Mixthissolution
thoroughly (see Note 2).
6.3.3 Extra-Hard Water—Equivalent to a total hardness of
1000 ppm as calcium carbonate (CaCO ).Transfer 73.1 mLof
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:
DesiredWaterHardness÷13.6805 (1)
@millilitresofsynthetichardwaterstockat20°Ctobe
dilutedvolumetricallyto1000mLwithwaterat20°C#
6.4 Other Carriers—Carriers other than water may be used
when appropriate.
7. Safety Precautions
7.1 Before testing, read the precautionary statements on the
FIG. 1 Vacuum Apparatus
product label or the Material Safety Data Sheet (MSDS), or
both. Take proper precautions to prevent skin contact and
inhalation of the fines or vapors, or both. Take care to prevent
all reagents shall conform to the specifications of the Commit-
contamination of the surrounding area. Always wear the
tee onAnalytical Reagents of theAmerican Chemical Society
appropriatesafetyequipmentand,whereindicated,wearrespi-
where such specifications are available.
ratory devices approved by the National Institute of Occupa-
tionalSafetyandHealth(NIOSH)fortheproductbeingtested.
6.2 Purity of Water—Unless otherwise indicated, reference
towatershallbeunderstoodtomeanreagentwater,TypeIV,as
8. Procedure
defined by Specification D1193.
8.1 Option A (Evaporation):
NOTE 1—Type IV grade reagent water may be prepared by distillation,
8.1.1 Each sample should be run in duplicate.
ion exchange, reverse osmosis, electrodialysis, or a combination thereof.
8.1.2 Weigh a 4-g sample into a weighing dish. Record the
6.3 Synthetic Hard Water Stock—Transfer 12.14 g of anhy-
sample weight (W ) to an accuracy of 60.10g.
drous calcium chloride (CaCl ) and 5.55 g of magnesium
8.1.
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