ASTM D5230-21

Standard Test Method for Carbon Black—Automated Individual Pellet Hardness

SIGNIFICANCE AND USE
4.1 Individual pellet hardness is related to several carbon black characteristics. Among these are mass strength and attrition. The subsequent level of dispersion obtained in some mixed compounds containing the carbon black may be affected by pellet hardness. Acceptable pellet hardness must be agreed to by the user and the producer.
SCOPE
1.1 This test method covers a procedure for measuring individual pellet hardness of carbon black by the automated pellet hardness tester.  
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.  
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.  
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: 31-Oct-2021
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.51 - Carbon Black Pellet Properties

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: D5230 − 21
Standard Test Method for
1
Carbon Black—Automated Individual Pellet Hardness
This standard is issued under the fixed designation D5230; 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 3. Summary of Test Method
3.1 A sample of carbon black is passed through two sieves
1.1 This test method covers a procedure for measuring
to isolate a fraction of uniform size.An appropriate amount of
individual pellet hardness of carbon black by the automated
pellets from this portion is selected and placed into the tester.
pellet hardness tester.
The individual pellets are pressed against a platen with a load
1.2 The values stated in SI units are to be regarded as the
cell for measuring force. As pressure is applied the pellet will
standard. The values in parentheses are for information only.
either break with a rapid force reduction or the pellet will
simply compress. The individual pellet hardness is the maxi-
1.3 This standard does not purport to address all of the
mum force prior to a force reduction of at least 3 cN or the
safety concerns, if any, associated with its use. It is the
maximum force required to compress the pellet to 90 %,
responsibility of the user of this standard to establish appro-
whichever comes first.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Significance and Use
1.4 This international standard was developed in accor-
4.1 Individual pellet hardness is related to several carbon
dance with internationally recognized principles on standard-
black characteristics. Among these are mass strength and
ization established in the Decision on Principles for the
attrition. The subsequent level of dispersion obtained in some
Development of International Standards, Guides and Recom-
mixedcompoundscontainingthecarbonblackmaybeaffected
mendations issued by the World Trade Organization Technical
by pellet hardness. Acceptable pellet hardness must be agreed
Barriers to Trade (TBT) Committee.
to by the user and the producer.
5. Apparatus
2. Referenced Documents
2 5.1 Automated Pellet Hardness Tester, capable of achieving
2.1 ASTM Standards:
an absolute measuring accuracy of 62 cN (2 gf) for the force
D1511Test Method for Carbon Black—Pellet Size Distri-
measurement and 60.1 mm for the diameter measurement and
bution
a relative accuracy of 60.5 cN (0.5 gf) for the force measure-
D1799 Practice for Carbon Black—Sampling Packaged
ment and 0.02 mm for the diameter measurement and consist-
Shipments
ing of the following major components and characteristics.
D1900Practice for Carbon Black—Sampling Bulk Ship-
5.1.1 A means for automatic loading of a pellet on the
ments
transport platen for transporting the pellet so as to contact the
D4483Practice for Evaluating Precision for Test Method
second platen with a minimum force. Typically one platen
StandardsintheRubberandCarbonBlackManufacturing
containsaforcemeasuringdevice.Therequiredforcetodetect
Industries
the contact shall not exceed 2 cN (2 gf),
E11Specification forWovenWireTest Sieve Cloth andTest
5.1.2 A means for applying the force while moving at a
Sieves
constant speed,
5.1.3 Ameans for transporting the pellet so to minimize its
movement during the application of force.
1
This test method is under the jurisdiction ofASTM Committee D24 on Carbon
5.1.4 Ameans for measuring the diameter of the individual
Black and is the direct responsibility of Subcommittee D24.51 on Carbon Black
pellet under test as measured along the axis of the application
Pellet Properties.
of force.
Current edition approved Nov. 1, 2021. Published December 2021. Originally
5.1.5 A control device for directing the instrument through
approved in 1992. Last previous edition approved in 2019 as D5230–19. DOI:
10.1520/D5230-21.
the test cycle that includes crushing the pellet under controlled
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
conditions, measuring and storing the results of the initial
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
diameter and crush force determinations, cleaning the frag-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. ments from the platen surfaces, and starting the next cycle.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

...

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: D5230 − 19 D5230 − 21
Standard Test Method for
1
Carbon Black—Automated Individual Pellet Hardness
This standard is issued under the fixed designation D5230; 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 covers a procedure for measuring individual pellet hardness of carbon black by the automated pellet hardness
tester.
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
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.
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:
D1511 Test Method for Carbon Black—Pellet Size Distribution
D1799 Practice for Carbon Black—Sampling Packaged Shipments
D1900 Practice for Carbon Black—Sampling Bulk Shipments
D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
3. Summary of Test Method
3.1 A sample of carbon black is passed through two sieves to isolate a fraction of uniform size. An appropriate amount of pellets
from this portion is selected and placed into the tester. The individual pellets are pressed against a platen with a load cell for
measuring force. As pressure is applied the pellet will either break with a rapid force reduction or the pellet will simply compress.
The individual pellet hardness is the maximum force prior to a force reduction of at least 3 cN or the maximum force required to
compress the pellet to 90 %, whichever comes first.
4. Significance and Use
4.1 Individual pellet hardness is related to several carbon black characteristics. Among these are mass strength and attrition. The
1
This test method is under the jurisdiction of ASTM Committee D24 on Carbon Black and is the direct responsibility of Subcommittee D24.51 on Carbon Black Pellet
Properties.
Current edition approved Dec. 1, 2019Nov. 1, 2021. Published December 2019December 2021. Originally approved in 1992. Last previous edition approved in 20142019
ε1
as D5230 – 14D5230 – 19. . DOI: 10.1520/D5230-19.10.1520/D5230-21.
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

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D5230 − 21
subsequent level of dispersion obtained in some mixed compounds containing the carbon black may be affected by pellet hardness.
Acceptable pellet hardness must be agreed to by the user and the producer.
5. Apparatus
5.1 Automated Pellet Hardness Tester, capable of achieving an absolute measuring accuracy of 62 cN (2 gf) for the force
measurement and 60.1 mm for the diameter measurement and a relative accuracy of 60.5 cN (0.5 gf) for the force measurement
and 0.02 mm for the diameter measurement and consisting of the following major components and characteristics.
5.1.1 A means for automatic loading of a pellet on the transport platen for transporting the pellet so as to contact the second platen
with a minimum force. Typically one platen contains a force measuring device. The required force to detect the contact shall not
exceed 2 cN (2 gf),
5.1.2 A means for applying the force while moving at a constant speed,
5.1.3 A means for transporting the pellet so to minimize its movement during the application of force.
5.1.4 A means for measuring the diameter of the individual pellet under test as measured along the axis of the application of force.
5.1.5 A control device for
...