ASTM E2427-22

Standard Test Method for Acceptance by Performance Testing for Test Sieves

SIGNIFICANCE AND USE
4.1 This test method may be used by producers, users, and general interest parties for research and development or production quality control work, and is useful for the comparison of test sieves.  
4.2 Because the reference material’s particle size distribution will affect the acceptance tolerance, the user should determine an acceptance tolerance based on their specific reference material.
SCOPE
1.1 This test method is a performance test for acceptance of test sieves.  
1.2 This test method compares the performance of an E11 test sieve against an inspection or calibration test sieve using a known quantity of reference material such that the long-term stability of test sieves can be measured.  
1.3 This is a test method for checking the accuracy and long-term reliability of test sieves. Since it is not possible to adjust the measuring capability of a test sieve, the test method is designed to offer a verification procedure based on sieving performance by comparison to a standard reference. This test method is not proposed as an alternative to the inspection methods in accordance with Specification E11 or the procedures in MNL 32.  
1.4 Units—The values stated in SI units are to be regarded as standard. The additional values given are included for information only and are not considered standard.  
1.5 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.  
1.6 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: 31-Jan-2022
• ICS: 19.120 - Particle size analysis. Sieving
• Technical Committee: E29 - Particle and Spray Characterization
• Drafting Committee: E29.01 - Sieves, Sieving Methods, and Screening Media

Relations

• Refers: ASTM E177-14 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-May-2014
• Refers: ASTM E11-13 - Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves
• Effective Date: 01-Oct-2013
• Refers: ASTM E1638-13 - Standard Terminology Relating to Sieves, Sieving Methods, and Screening Media
• Effective Date: 01-Jun-2013
• Refers: ASTM E691-13 - Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• Effective Date: 01-May-2013
• Refers: ASTM E177-13 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-May-2013
• Refers: ASTM E1638-12 - Standard Terminology Relating to Sieves, Sieving Methods, and Screening Media
• Effective Date: 15-May-2012
• Refers: ASTM E1638-11a - Standard Terminology Relating to Sieves, Sieving Methods, and Screening Media
• Effective Date: 15-Nov-2011
• Refers: ASTM E691-11 - Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• Effective Date: 01-Nov-2011
• Refers: ASTM E1638-11 - Standard Terminology Relating to Sieves, Sieving Methods, and Screening Media
• Effective Date: 01-May-2011
• Refers: ASTM E1638-10 - Standard Terminology Relating to Sieves, Sieving Methods, and Screening Media
• Effective Date: 01-Dec-2010
• Refers: ASTM E177-10 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-Oct-2010
• Refers: ASTM E11-09e1 - Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves
• Effective Date: 01-May-2009
• Refers: ASTM E1638-09 - Standard Terminology Relating to Sieves, Sieving Methods and Screening Media
• Effective Date: 01-Mar-2009
• Refers: ASTM E177-08 - Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• Effective Date: 01-Oct-2008
• Refers: ASTM E691-08 - Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• Effective Date: 01-Oct-2008

Overview

ASTM E2427-22: Standard Test Method for Acceptance by Performance Testing for Test Sieves provides a standardized procedure to evaluate and accept test sieves based on performance testing. Developed by ASTM International, this method is essential for ensuring the accuracy, repeatability, and long-term reliability of test sieves used in particle size analysis and material quality control. The test method compares an E11 test sieve’s performance against a certified inspection or calibration sieve using a specific reference material. ASTM E2427-22 helps producers, manufacturers, and laboratories verify that their sieves continue to provide consistent results throughout their service life, supporting both research and production environments.

Key Topics

• Performance-Based Testing: Outlines a procedure for assessing test sieves by comparing their sieving results to a reference or calibration sieve using a standardized reference material.
• Acceptance Criteria: Describes how to assess the percent deviation between a test sieve and a reference sieve, with a guideline that acceptable deviation should typically not exceed 5%, though users are encouraged to set tolerances based on their specific reference materials.
• Repeatability and Reproducibility: Incorporates interlaboratory data to address the method’s precision, including repeatability and reproducibility limits, supporting reliable decision-making.
• Reference Material: Stresses the importance of selecting or preparing reference material with a consistent particle size distribution, as this directly impacts acceptance tolerance.
• Apparatus and Good Practices: Specifies necessary testing equipment (test sieves, sieve shaker, balance) and best practices for apparatus preparation, test execution, and recordkeeping.
• Cleaning and Maintenance: Recommends proper cleaning methods for test sieves to ensure reliability and prevent contamination.

Applications

ASTM E2427-22 is highly relevant in a range of industries where particle size distribution is critical, such as:

• Quality Control in Production: Enables manufacturers in industries like pharmaceuticals, chemicals, aggregates, food, and minerals to regularly verify and accept test sieves, ensuring consistent process and product quality.
• Research and Development: Facilitates reliable and replicable particle size analysis for experimental studies and product development.
• Laboratory and Testing Services: Provides laboratories with a robust, standardized approach to evaluating the performance of test sieves over time, supporting accreditation and traceability requirements.
• Comparison of Test Sieves: Offers a practical method for comparing new, used, or different brands and types of test sieves, supporting informed purchasing and maintenance decisions.
• Preventing Measurement Drift: Helps identify wear or changes in sieve openings that may impact analytical results, safeguarding against measurement inaccuracies due to long-term use.

Related Standards

ASTM E2427-22 references and should be considered alongside several other vital ASTM documents for a comprehensive sieving program:

• ASTM E11 – Specification for Woven Wire Test Sieve Cloth and Test Sieves. Establishes the design and construction criteria for test sieves used as references in this test method.
• ASTM E177 – Practice for Use of the Terms Precision and Bias in ASTM Test Methods. Provides a framework for understanding and reporting test method accuracy.
• ASTM E691 – Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method. Outlines procedures for conducting precision studies, as referenced in E2427.
• ASTM E1638 – Terminology Relating to Sieves, Sieving Methods, and Screening Media. Supplies definitions of relevant terms.
• ASTM MNL 32 – Manual on Test Sieving Methods: Guidelines for Establishing Sieve Analysis Procedures. Offers broader guidance on test sieving methods and best practices.

Conclusion

Implementing ASTM E2427-22 provides a systematic approach to verifying test sieve performance, enhancing confidence in particle size analysis for production and research. Following this standard ensures consistent, reliable, and comparable results, vital for quality control and regulatory compliance across multiple industries. For organizations seeking to optimize their particle size analysis, regular performance testing using ASTM E2427-22 and related standards is a best practice.

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: E2427 − 22
Standard Test Method for
Acceptance by Performance Testing for Test Sieves
This standard is issued under the fixed designation E2427; 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* 2. Referenced Documents
1.1 This test method is a performance test for acceptance of 2.1 ASTM Standards:
test sieves. E11 Specification for Woven Wire Test Sieve Cloth and Test
Sieves
1.2 This test method compares the performance of an E11
E177 Practice for Use of the Terms Precision and Bias in
test sieve against an inspection or calibration test sieve using a
ASTM Test Methods
known quantity of reference material such that the long-term
E691 Practice for Conducting an Interlaboratory Study to
stability of test sieves can be measured.
Determine the Precision of a Test Method
1.3 This is a test method for checking the accuracy and
E1638 Terminology Relating to Sieves, Sieving Methods,
long-term reliability of test sieves. Since it is not possible to
and Screening Media
adjust the measuring capability of a test sieve, the test method
MNL 32 Manual on Test Sieving Methods Guidelines for
is designed to offer a verification procedure based on sieving
Establishing Sieve Analysis Procedures
performance by comparison to a standard reference. This test
3. Terminology
method is not proposed as an alternative to the inspection
methods in accordance with Specification E11 or the proce-
3.1 Definitions—For definitions of related terms, refer to
dures in MNL 32.
Terminology E1638.
1.4 Units—The values stated in SI units are to be regarded
3.2 Definitions of Terms Specific to This Standard:
as standard. The additional values given are included for
3.2.1 calibration test sieve, n—a test sieve manufactured
information only and are not considered standard.
usingsieveclothwhichhasbeeninspectedafterbeingmounted
1.5 This standard does not purport to address all of the in the sieve frame, and that meets the requirements of Table 1
safety concerns, if any, associated with its use. It is the
of Specification E11 in part based on the standard deviation of
responsibility of the user of this standard to establish appro- the required number of sample openings in the test sieve
priate safety, health, and environmental practices and deter- (Column 11) not exceeding the maximum allowable for a
mine the applicability of regulatory limitations prior to use.
confidence level of 99.73 % (Column 12). E11
1.6 This international standard was developed in accor-
3.2.2 candidate test sieve, n—the test sieve to be perfor-
dance with internationally recognized principles on standard-
mance tested.
ization established in the Decision on Principles for the
3.2.3 compliance test sieve, n—a test sieve manufactured
Development of International Standards, Guides and Recom-
using sieve cloth which has been inspected prior to being
mendations issued by the World Trade Organization Technical
mounted in the sieve frame; and that meets the requirements of
Barriers to Trade (TBT) Committee.
Table 1 in part based on the standard deviation of the required
number of sample openings per 100 square feet of sieve cloth
(Column 7) not exceeding the maximum allowable for a
confidence level of 66 % (Column 8). E11
3.2.4 endpoint, n—point at which no material falls through
the sieve concluding the sieving, taking into account sample
degradation.
3.2.5 inspection test sieve, n—atest sieve manufactured
usingsieveclothwhichhasbeeninspectedafterbeingmounted
This test method is under the jurisdiction ofASTM Committee E29 on Particle
and Spray Characterization and is the direct responsibility of Subcommittee E29.01
on Sieves, Sieving Methods, and Screening Media. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
CurrenteditionapprovedFeb.1,2022.PublishedJuly2022.Originallyapproved contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
in 2005. Last previous edition approved in 2018 as E2427 – 18. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
E2427-22. 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
E2427 − 22
in the sieve frame, and that meets the requirements of Table 1 minimizing dust inhalation and working with hazardous mate-
of Specification E11 in part based on the standard deviation of rials should be followed at all times. Materials likely to
the required number of sample openings in the test sieve produce high levels of dust may not be appropriate for use
(Column 9) not exceeding the maximum allowable for a without special precautions.
confidence level of 99 % (Column 10). E11
8. Preparation of Apparatus
3.2.6 percent retained, n—mass fraction percentage of ma-
8.1 Select an inspection or calibration test sieve of the same
terial that is left upon or retained by the sieve after the test has
nominalaperturesizeasthecandidatetestsievetobetestedfor
been performed.
acceptance.
3.2.7 sieve shaker, n—the device used to agitate the sieves,
8.2 The selected candidate test sieve to be tested shall be
excluding hand sieving.
physically sound. The sieve cloth shall be taut and free of
3.2.8 test sieve (sieve cloth), n—an apparatus manufactured
broken or distorted wires. Joints shall be intact. Sieve frames
by mounting E11 sieve cloth in a frame, designed for use in
shall be cylindrical and nest easily with other sieves.
particle size analysis by sieving. E11
8.3 Select the reference material to be used to conduct the
4. Significance and Use
test. Reference materials shall be either certified standard test
materials that are purchased or prepared by the user. If
4.1 This test method may be used by producers, users, and
prepared by the user, it is recommended that the reference
general interest parties for research and development or pro-
materialbeofthesamecompositionastheproductionmaterial.
duction quality control work, and is useful for the comparison
If less than the entire batch is used, acquire a test sample in
of test sieves.
accordance with MNL 32.
4.2 Because the reference material’s particle size distribu-
tion will affect the acceptance tolerance, the user should
9. Preparation of Reference Material
determine an acceptance tolerance based on their specific
9.1 User-Prepared Reference Material—The reference ma-
reference material.
terial may be prepared from the production material being
tested, provided that the material will not blind or adhere to the
5. Interferences
sieve apertures nor break down during the test procedure.
5.1 The long-term use of test sieves can compromise the
Prepared reference material is not traceable and shall only be
reliability of test results. Depending on the type of materials
used internally for this comparative test. If certified reference
being measured, wear can occur on the diameter of the wires
material is used, no preparation of reference material is
causing opening sizes to change and measuring capability to
required.
drift.
9.2 In accordance with the size of the reference material
5.2 The specific particle size distribution of the reference
produced, an inspection or calibration test sieve of the same
material will affect the acceptance tolerance. Therefore each
size and a sieve that is one size coarser and a collection pan are
reference material shall be developed based on a desired
required. For example, if 125-µm reference material is to be
particle size distribution.
produced, a 125-µm (No. 120) sieve, a 150-µm (No. 100)
5.3 Care should be taken with the use of the reference sieve, and a collection pan are used.
materials. Since the same batch of material may be used more
9.3 Nest the inspection or calibration test sieves in the
than one time, it shall not be contaminated as variation in the
shaker with the coarser sieve in the top position, the finer sieve
material will affect the test results.
in the second position, and the collection pan in the bottom
5.4 The exact same sieve shaker shall be used for any position. Any additional shaker positions are not used.
performance comparison.
9.4 Add all the reference material to the coarser sieve.
Continue sieving until approximately half the total amount of
6. Apparatus
referencematerialrequiredisretainedonthefinersieveandthe
6.1 Candidate Test Sieve, sieve in accordance with Specifi-
balance is in the collection pan.All the material retained on the
cation E11.
finer 125-µm (No. 120) sieve will become reference material,
as well as an equal amount by weight of the material in the
6.2 Sieve Shaker, able to continuously agitate the sieve for
collection pan. The material retained on the larger 150-µm
the time required to reach the endpoint.
(No. 100) sieve is discarded. Combine all the materials from
6.3 Inspection or Calibration Test Sieve, certified as such by
the finer sieve and the collection pan in equal proportions to
the manufacturer in accordance with Specification E11.
produce the reference material required.
6.4 Balance, having the capacity to weigh the appropriate
10. Performance Test
...

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: E2427 − 18 E2427 − 22
Standard Test Method for
Acceptance by Performance Testing for Test Sieves
This standard is issued under the fixed designation E2427; 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 Scope*
1.1 This test method is a performance test for acceptance of test sieves.
1.2 This test method compares the performance of a an E11 test sieve against an inspection or calibration test sieve using a known
quantity of reference material such that the long-term stability of test sieves can be measured.
1.3 This is a test method for checking the accuracy and long-term reliability of test sieves. Since it is not possible to adjust the
measuring capability of a test sieve, the test method is designed to offer a verification procedure based on sieving performance by
comparison to a standard reference. This test method is not proposed as an alternative to the inspection methods in accordance with
Specification E11 or the procedures in MNL 32.
1.4 Units—The values stated in SI units are to be regarded as standard. The additional values given are included for information
only and are not considered standard.
1.5 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.
1.6 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.
This test method is under the jurisdiction of ASTM Committee E29 on Particle and Spray Characterization and is the direct responsibility of Subcommittee E29.01 on
Sieves, Sieving Methods, and Screening Media.
Current edition approved Oct. 1, 2018Feb. 1, 2022. Published October 2018July 2022. Originally approved in 2005. Last previous edition approved in 20132018 as
E2427 – 13.E2427 – 18. DOI: 10.1520/E2427-18.10.1520/E2427-22.
*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
E2427 − 22
2. Referenced Documents
2.1 ASTM Standards:
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E1638 Terminology Relating to Sieves, Sieving Methods, and Screening Media
MNL 32 Manual on Test Sieving Methods Guidelines for Establishing Sieve Analysis Procedures
3. Terminology
3.1 Definitions—For definitions of related terms, refer to Terminology E1638.
3.2 Definitions of Terms Specific to This Standard:—For terms relating to sieve analysis, refer to Terminology E1638.
3.2.1 calibration test sieve, n—a test sieve manufactured using sieve cloth which has been inspected after being mounted in the
sieve frame, and that meets the requirements of Table 1 of Specification E11 in part based on the standard deviation of the required
number of sample openings in the test sieve (Column 11) not exceeding the maximum allowable for a confidence level of 99.73 %
(Column 12). E11
3.2.2 candidate test sieve, n—the test sieve to be performance tested.
3.2.3 compliance test sieve, n—a test sieve manufactured using sieve cloth which has been inspected prior to being mounted in
the sieve frame; and that meets the requirements of Table 1 in part based on the standard deviation of the required number of
sample openings per 100 square feet of sieve cloth (Column 7) not exceeding the maximum allowable for a confidence level of
66 % (Column 8). E11
3.2.4 endpoint, n—point at which no material falls through the sieve concluding the sieving, taking into account sample
degradation.
3.2.5 inspection test sieve, n—atest sieve manufactured using sieve cloth which has been inspected after being mounted in the
sieve frame, and that meets the requirements of Table 1 of Specification E11 in part based on the standard deviation of the required
number of sample openings in the test sieve (Column 9) not exceeding the maximum allowable for a confidence level of 99 %
(Column 10). E11
3.2.6 percent retained, n—mass fraction percentage of material that is left upon or retained by the sieve after the test has been
performed.
3.1.5 sieve, n—an apparatus consisting of a medium with regularly spaced apertures of uniform size, mounted in a suitable frame
or holder, for use in separating material according to size.
3.2.7 sieve shaker, n—the device used to agitate the sieves, excluding hand sieving.
3.2.8 test sieve (sieve cloth), n—an apparatus manufactured by mounting E11 sieve cloth in a frame, designed for use in particle
size analysis by sieving. E11
4. Significance and Use
4.1 This test method may be used by producers, users, and general interest parties for research and development or production
quality control work, and is useful for the comparison of test sieves.
4.2 Because the reference material’s particle size distribution will affect the acceptance tolerance, the user should determine an
acceptance tolerance based on their specific reference material.
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.
E2427 − 22
5. Interferences
5.1 The long-term use of test sieves can compromise the reliability of test results. Depending on the type of materials being
measured, wear can occur on the diameter of the wires causing opening sizes to change and measuring capability to drift.
5.2 The specific particle size distribution of the reference material will affect the acceptance tolerance. Therefore each reference
material shall be developed based on a desired particle size distribution.
5.3 Care should be taken with the use of the reference materials. Since the same batch of material may be used more than one
time, it shall not be contaminated as variation in the material will affect the test results.
5.4 The exact same sieve shaker shall be used for any performance comparison.
6. Apparatus
6.1 Candidate Test Sieve, sieve in accordance with Specification E11 tolerances.
6.2 Sieve Shaker, able to continuously agitate the sieve for the time required to reach the endpoint.
6.3 Inspection or Calibration Test Sieve, certified as such by the manufacturer in accordance with Specification E11 tolerances.
6.4 Balance, having the capacity to weigh the appropriate sample sizes in accordance with Annex A1 in grams, with accuracy to
0.01 g or better.
7. Hazards
7.1 Manufacturers’ procedures should be followed when operating machinery such as sieve-shaking devices. The testing of some
materials may produce dust. Proper procedures for minimizing dust inhalation and working with hazardous materials should be
followed at all times. Materials likely to produce high levels of dust may not be appropriate for use without special precautions.
8. Preparation of Apparatus
8.1 Select an inspection or calibration test sieve of the same nominal aperture size as the candidate test sieve to be tested for
acceptance.
8.2 The selected candidate test sieve to be tested shall be physically sound. The sieve cloth shall be taut and free of broken or
distorted wires. Joints shall be intact. Sieve frames shall be cylindrical and nest easily with other sieves.
8.3 Select the reference material to be used to conduct the test. Reference materials shall be either certified standard test materials
that are purchased or prepared by the user. If prepared by the user, it is recommended that the reference material be of the same
composition as the production material. If less than the entire batch is used, acquire a test sample in accordance with MNL 32.
9. Preparation of Reference Material
9.1 User-Prepared Reference Material—The reference material may be prepared from the production material being tested,
provided that the material will not blind or adhere to the sieve apertures nor break down during the test procedure. Prepared
reference material is not traceable and shall only be used internally for this comparative test. If certified reference material is used,
no preparation of reference material is required.
9.2 In accordance with the size of the reference material produced, a an inspection or calibration test sieve of the same size and
a sieve that is one size coarser and a collection pan are required. For example, if 125-μm reference material is to be produced, a
125-μm (No. 120) sieve, a 150-μm (No. 100) sieve, and a collection pan are used.
9.3 Nest the inspection or calibration test sieves in the shaker with the coarser sieve in the top position, the finer sieve in the second
position, and the collection pan in the bottom position. Any additional shaker positions are not used.
E2427 − 22
9.4 Add all the reference material to the coarser sieve. Continue sieving until approximately half the total amount of reference
material required is retained on the finer sieve and the balance is in the collection pan. All the material retained on the finer 125-μm
(No. 120) sieve will become reference material, as well as an equal amount by weight of the material in the collection pan. The
material retained on the larger 150-μm (No. 100) sieve is discarded. Combine all the materials from the finer sieve and the
collection pan in equal proportions to produce the amount of reference material required in accordance with required.Annex A1
for the performance testing.
10. Performance Test Records
10.1 A candidate test sieve may be evaluated for acceptance based on this standard comparative test method. The resulting
performance test records shall be retained for the life of the sieve with its traceable number in accordance with Specification E11
marking requirements.
11. Procedure
11.1 Weigh the reference material that will be used to perform the test on a calibrated scale or balance; the recommended quantity
may be referenced in accordance with balance.Annex A1.
11.2 Nest the test sieve to be tested in the collection pan in the shaker.
11.3 Place the reference material on the sieve and run the sieve shaker until endpoint.
11.4 Weigh the reference material retained on the candidate test sieve. The remainder of the reference material shall pass into the
collection pan in the bottom position. The proportion of the retained material to the total starting material will be used for
comparing the performance of the candidate test sieve to the inspection or calibration test sieve. It is not necessary to repeat this
procedure on the inspection or calibration test sieve each time a sieve performance test is performed unless the material degraded
during the sieving process. The inspection or calibration test sieve retained material proportion will remain the constant for
comparison provided the same batch of reference material is used. used (see 12.1).
11.5 After the weight is obtained, mix the retained material with the passed material in the collection pan, which will then become
the reference material used to check the performance of subsequent candidate test sieves. Before each candidate test sieve is tested,
the recombined reference material shall be weighed to obtain the starting weight for the next test. If the starting weight is less than
97 % of the original quantity, a new batch of reference material is required.
11.6 Repeat procedures 11.1 – 11.5 for all subsequent test sieves. Record the results for each sieve.
11.7 The complete procedure shall be repeated for each different size test sieve to be tested using the corresponding size reference
material.
12. Calculation or Interpretation of Results
12.1 Normally, not all
...