ASTM D7724-18

Standard Test Method for Carbon Black—Non-Dispersible Matter by Mechanical Flushing (NDM)

SIGNIFICANCE AND USE
4.1 The quantity of non-dispersible matter of carbon black is important in some molded or extruded products as it may relate to the surface appearance of those products. The maximum amount of non dispersible matter and the minimum size of the particles to be analyzed in each application is normally determined and agreed to between the user and the producer.
SCOPE
1.1 This test method covers the determination of non-dispersible matter after mechanical water flushing of regular untreated carbon blacks. It may not be applicable to oil-treated carbon blacks because the oil would prevent proper wetting of the black by water.  
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.  
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: Historical
• Publication Date: 31-May-2018
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.31 - Non-Carbon Black Components of Carbon Black

Relations

• Replaces: ASTM D7724-11(2016) - Standard Test Method for Carbon Black—Non-Dispersible Matter by Mechanical Flushing (NDM)
• Effective Date: 01-Jun-2018

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D7724 − 18
Standard Test Method for
Carbon Black—Non-Dispersible Matter by Mechanical
1
Flushing (NDM)
This standard is issued under the fixed designation D7724; 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 3. Summary of Test Method
1.1 This test method covers the determination of non- 3.1 A sample of carbon black is mechanically flushed with
dispersible matter after mechanical water flushing of regular water through a wire-mesh screen of a specified size until all
untreated carbon blacks. It may not be applicable to oil-treated that remains is a non-dispersible matter of carbon black. The
carbon blacks because the oil would prevent proper wetting of non-dispersible matter is dried, weighed, and the amount of
the black by water. residue is expressed as mg/kg (ppm) of the original sample.
1.2 The values stated in SI units are to be regarded as
4. Significance and Use
standard. No other units of measurement are included in this
4.1 The quantity of non-dispersible matter of carbon black
standard.
is important in some molded or extruded products as it may
1.3 This standard does not purport to address all of the
relate to the surface appearance of those products. The maxi-
safety concerns, if any, associated with its use. It is the
mum amount of non dispersible matter and the minimum size
responsibility of the user of this standard to establish appro-
of the particles to be analyzed in each application is normally
priate safety, health, and environmental practices and deter-
determined and agreed to between the user and the producer.
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
5. Apparatus
dance with internationally recognized principles on standard-
3
5.1 Sieve Apparatus, as shown in Fig. 1.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5.2 Balance, with a sensitivity of 0.01 g.
mendations issued by the World Trade Organization Technical
5.3 Analytical Balance, with a sensitivity of 0.1 mg.
Barriers to Trade (TBT) Committee.
5.4 Oven, gravity-convection type, capable of temperature
2. Referenced Documents regulation within 61°C at 125°C and temperature uniformity
2 within 65°C.
2.1 ASTM Standards:
D1799 Practice for Carbon Black—Sampling Packaged 5.5 Sieves, diameter 100 mm, of either phosphor bronze or
3
Shipments stainless steel. The sieve shall be in accordance with Specifi-
D1900 Practice for Carbon Black—Sampling Bulk Ship- cation E11. The sieve size to be used shall be agreed upon
ments between the purchaser and the carbon black manufacture.
D4483 Practice for Evaluating Precision for Test Method
5.6 Weighing Dishes.
Standards in the Rubber and Carbon Black Manufacturing
Industries
6. Precautions
E11 Specification for Woven Wire Test Sieve Cloth and Test
6.1 Install the apparatus as described in the manufacturer’s
Sieves
instructions and keep it clean at all times to prevent contami-
nation.
1
This test method is under the jurisdiction ofASTM Committee D24 on Carbon
6.2 Examinethesieveseachtimetheyareusedtomakesure
Black and is the direct responsibility of Subcommittee D24.31 on Non-Carbon
that no cracks or holes have developed.
Black Components of Carbon Black.
CurrenteditionapprovedJune1,2018.PublishedJuly2018.Originallyapproved
in 2011. Last previous edition approved in 2016 as D7724 – 11 (2016). DOI:
3
10.1520/D7724-18. The sole source of supply of the apparatus known to the committee at this time
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or is Krahnen IQS, GmbH, Paffrather Str. 13–15, D-51069 Koeln, Germany. If you are
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM aware of alternative suppliers, please provide this information to ASTM Interna-
Standards volume information, refer to the standard’s Document Summary page on tional Headquarters.Your comments will receive careful consideration at a meeting
1
the ASTM website. of the responsible technical committee, which you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D7724 − 18
FIG. 1 Schematic Diagram of NDA Test Equipment
7. Sampling 8.8 The end of the test is indicated by a vacuum application
without any water flowing. After that the measurement stops.
7.1 Samples shall be taken in accordance with Practice
D1799 or Practice D1900. 8.9 Disassemble the sieve and dry in an oven at a temp
...

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: D7724 − 11 (Reapproved 2016) D7724 − 18
Standard Test Method for
Carbon Black—Non-Dispersible Matter by Mechanical
1
Flushing (NDM)
This standard is issued under the fixed designation D7724; 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 the determination of non-dispersible matter after mechanical water flushing of regular untreated
carbon blacks. It may not be applicable to oil-treated carbon blacks because the oil would prevent proper wetting of the black by
water.
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.
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:
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 mechanically flushed with water through a wire-mesh screen of a specified size until all that
remains is a non-dispersible matter of carbon black. The non-dispersible matter is dried, weighed, and the amount of residue is
expressed as mg/kg (ppm) of the original sample.
4. Significance and Use
4.1 The quantity of non-dispersible matter of carbon black is important in some molded or extruded products as it may relate
to the surface appearance of those products. The maximum amount of non dispersible matter and the minimum size of the particles
to be analyzed in each application is normally determined and agreed to between the user and the producer.
1
This test method is under the jurisdiction of ASTM Committee D24 on Carbon Black and is the direct responsibility of Subcommittee D24.31 on Non-Carbon Black
Components of Carbon Black.
Current edition approved June 1, 2016June 1, 2018. Published July 2016July 2018. Originally approved in 2011. Last previous edition approved in 20112016 as
D7724 – 11.D7724 – 11 (2016). DOI: 10.1520/D7724-11R16.10.1520/D7724-18.
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 ----------------------
D7724 − 18
5. Apparatus
3
5.1 Sieve Apparatus, as shown in Fig. 1.
5.2 Balance, with a sensitivity of 0.01 g.
5.3 Analytical Balance, with a sensitivity of 0.1 mg.
5.4 Oven, gravity-convection type, capable of temperature regulation within 61°C at 125°C and temperature uniformity within
65°C.
3
5.5 Sieves, diameter 100 mm, of either phosphor bronze or stainless steel. The sieve shall be in accordance with Specification
E11. The sieve size to be used shall be agreed upon between the purchaser and the carbon black manufacture.
5.6 Weighing Dishes.
6. Precautions
6.1 Install the apparatus as described in the manufacturer’s instructions and keep it clean at all times to prevent contamination.
6.2 Examine the sieves each time they are used to make sure that no cracks or holes have developed.
7. Sampling
7.1 Samples shall be taken in accordan
...