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ASTM D1921-06

(Test Method)

Standard Test Methods for Particle Size (Sieve Analysis) of Plastic Materials

Standard Test Methods for Particle Size (Sieve Analysis) of Plastic Materials

SIGNIFICANCE AND USE
These test methods can be used to determine particle size distribution and therefore are useful for determining lot-to-lot uniformity.
The particle sizes of plastic materials affect the handling characteristics and sometimes will affect the processing characteristics of some polymers.
SCOPE
1.1 These test methods cover the measurement of the particle size of plastic materials in the powdered, granular, or pelleted forms in which they are commonly supplied. As these test methods utilize dry sieving, the lower limit of measurement is considered to be about 38 m (No. 400 sieve). For smaller particle sizes, sedimentation test methods are recommended.
1.2 Two test methods are described:
1.2.1 Test Method AThis test method uses multiple sieves selected to span the particle size of the material. This method is used to determine the mean particle diameter and particle size distribution.
1.2.2 Test Method BThis test method is an abbreviated version of Test Method A conducted with a few specific sieves. This test method determines "percent passing" or "percent retained" on a given sieve. Test Method B is applicable to materials which do not have a normal particle size distribution such as pellets and cubes.
1.3 The values stated in SI units shall be considered standard for dimensions of the wire cloth openings and the diameter of the wires used in the wire cloth. The values stated in inch-pound units shall be considered standard with regard to the sieve frames.
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.
There is no technically equivalent ISO standard.

General Information

Status
Historical
Publication Date
31-Mar-2006
ICS
19.120 - Particle size analysis. Sieving
Technical Committee
D20 - Plastics
Drafting Committee
D20.70 - Analytical Methods
Current Stage
Ref Project

Relations

Replaces
ASTM D1921-01 - Standard Test Methods for Particle Size (Sieve Analysis) of Plastic Materials
Effective Date
01-Apr-2006
Replaced By
ASTM D1921-06e1 - Standard Test Methods for Particle Size (Sieve Analysis) of Plastic Materials
Effective Date
01-Apr-2006
Referred By
ASTM D3218-07(2018) - Standard Specification for Polyolefin Monofilaments
Effective Date
01-Apr-2006
Referred By
ASTM D7486-22 - Standard Test Method for Measurement of Fines and Dust Particles on Plastic Pellets by Wet Analysis
Effective Date
01-Apr-2006
Referred By
ASTM D8424-21 - Standard Guide for Retroreflective Composite Optics Laboratory Procedures
Effective Date
01-Apr-2006
Referred By
ASTM D1755-21 - Standard Specification for Poly(Vinyl Chloride) Resins
Effective Date
01-Apr-2006
Referred By
ASTM D4020-18 - Standard Specification for Ultra-High-Molecular-Weight Polyethylene Molding and Extrusion Materials
Effective Date
01-Apr-2006
Referred By
ASTM D8402-23 - Standard Practice for Development of Microplastic Reference Samples for Calibration and Proficiency Evaluation in All Types of Water Matrices with High to Low Levels of Suspended Solids
Effective Date
01-Apr-2006
Referred By
ASTM E1229-21 - Standard Specification for Calcium Hypochlorite
Effective Date
01-Apr-2006
Referred By
ASTM D5861-07(2017) - Standard Guide for Significance of Particle Size Measurements of Coating Powders
Effective Date
01-Apr-2006
Referred By
ASTM D3451-06(2017) - Standard Guide for Testing Coating Powders and Powder Coatings
Effective Date
01-Apr-2006

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ASTM D1921-06 - Standard Test Methods for Particle Size (Sieve Analysis) of Plastic MaterialsASTM D1921-06 - Standard Test Methods for Particle Size (Sieve Analysis) of Plastic Materials
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ASTM D1921-06 - Standard Test Methods for Particle Size (Sieve Analysis) of Plastic Materials
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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:D1921–06
Standard Test Methods for
1
Particle Size (Sieve Analysis) of Plastic Materials
This standard is issued under the fixed designation D1921; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* 2. Referenced Documents
2
1.1 These test methods cover the measurement of the 2.1 ASTM Standards:
particle size of plastic materials in the powdered, granular, or E11 SpecificationforWovenWireTestSieveClothandTest
pelleted forms in which they are commonly supplied.As these Sieves
test methods utilize dry sieving, the lower limit of measure- E691 Practice for Conducting an Interlaboratory Study to
ment is considered to be about 38 µm (No. 400 sieve). For Determine the Precision of a Test Method
smaller particle sizes, sedimentation test methods are recom-
3. Summary of Test Methods
mended.
3.1 A dry mass of plastic material is placed on a series of
1.2 Two test methods are described:
1.2.1 Test Method A—This test method uses multiple sieves sieves arranged in order of increasing fineness and the mass is
divided into fractions corresponding to the sieve opening.
selected to span the particle size of the material. This method
is used to determine the mean particle diameter and particle
4. Significance and Use
size distribution.
4.1 These test methods can be used to determine particle
1.2.2 Test Method B—This test method is an abbreviated
size distribution and therefore are useful for determining
version ofTest MethodAconducted with a few specific sieves.
lot-to-lot uniformity.
This test method determines “percent passing” or “percent
4.2 The particle sizes of plastic materials affect the handling
retained” on a given sieve. Test Method B is applicable to
characteristics and sometimes will affect the processing char-
materials which do not have a normal particle size distribution
acteristics of some polymers.
such as pellets and cubes.
1.3 The values stated in SI units shall be considered
5. Interferences
standard for dimensions of the wire cloth openings and the
5.1 Some materials develop a static charge during sieving.
diameter of the wires used in the wire cloth. The values stated
This charge interferes with the sieving process and results in a
in inch-pound units shall be considered standard with regard to
coarse bias. Use of an antistat is necessary to obtain meaning-
the sieve frames.
ful results.
1.4 This standard does not purport to address all of the
5.2 The choice of antistat (or slip agent) has been known to
safety concerns, if any, associated with its use. It is the
affect the coarse bias. Some materials are more effective in
responsibility of the user of this standard to establish appro-
aiding the fines to separate from the mass.
priate safety and health practices and determine the applica-
5.3 Too much material on a sieve causes mass blinding and
bility of regulatory limitations prior to use.
results in a coarse bias. The sieve selection and charge weight
NOTE 1—There is no technically equivalent ISO standard.
must be chosen to avoid overloading any sieve.
1
These test methods are under the jurisdiction of ASTM Committee D20 on
Plastics and are the direct responsibility of Subcommittee D20.70 on Analytical
2
Methods (Section D20.70.01). For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2006. Published June 2006. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1961. Last previous edition approved in 2001 as D1921 - 01. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D1921-06. the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D1921–06
5.4 Wavy, improperly stretched wire-cloth may allow wires 11.2 If possible, condition the material to the laboratory
to separate without being visually damaged. Sieves with wavy temperature and humidity.
or torn wires shall not be used, as they no longer conform to
TEST METHOD A
Specification E11.
6. Apparatus
12. Procedure
6.1 Balance, 500-g minimum capacity with the capability of
12.1 Selectsievesinsufficientnumbertocovertheexpected
reading to the nearest 0.1 g.
range of particle sizes, and nest them together in order of
6.2 Mechanical Sieving Device and Time Switch—A me-
diminishing opening with the coarsest siev
...

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4.1 These test methods are used to determine particle size distribution and therefore are useful for determining lot-to-lot uniformity.  
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1.1 These test methods cover the measurement of the particle size of plastic materials in the powdered, granular, or pelleted forms in which they are commonly supplied. As these test methods utilize dry sieving, the lower limit of measurement is considered to be about 38 μm (No. 400 sieve). For smaller particle sizes, sedimentation test methods are recommended.  
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SCOPE
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SCOPE
1.1 This practice describes procedural steps to create a correlation that can be used to compare results of proppant size distributions between dynamic imaging analyzers (analyzers) and prescribed sieve sets.  
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1.5 Observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026, unless superseded by this standard.  
1.5.1 The procedures used to specify how data are collected/recorded and calculated in Practice D6026 are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering data.  
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ASTM D2977-22(Practice)
Standard Practice for Particle Size Range of Peat Materials for Horticultural Purposes

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5.1 This practice is primarily used in the horticulture industry to separates peat material into arbitrary fractions based on particle size. Physical separation of peat material according to particle size provides a useful indicator of the properties of a peat specimen such as pore space and degree of decomposition for unprocessed peat. It also provides a means of determining the amount of foreign matter not in a divided state such as sticks, stones, and glass.
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SCOPE
1.1 Peat materials consist of particles with various sizes. This practice covers the separation of peat particles into coarse, medium, and fine size fractions using the 2.36 mm (No. 8) and 0.850 mm (No. 20) sieves equipped with cover and bottom pan. This practice is applicable for peat materials used in the horticultural industry and can be used to verify the degree of decomposition of peat and to determine the foreign matter content.  
1.2 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information only and are not considered standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard.  
1.2.1 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This practice implicitly combines two separate systems of units; the absolute and the gravitational systems. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit of mass. However, the use of balances and scales recording pounds of mass (lbm) or recording density in lbm/ft3 shall not be regarded as nonconformance with this standard.  
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1.3.1 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design.  
1.4 This practice offers a set of instructions for performing one or more specific operations. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this practice may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a project’s many unique aspects. The word “Standard” in the title of this document means only that the document has been approved through the ASTM consensus process.  
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4.1 This test method can be used to determine particle size distributions of catalysts and supports for materials specifications, manufacturing control, and research and development work.
SCOPE
1.1 This test method covers the determination of particle size distribution of catalytic powder material using a sieving instrument and is one of several found valuable for the measurement of particle size. This test method is particularly suitable for particles in the 20 to 420 μm range. (See Terminology D3766.)  
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