ASTM D1512-15

Standard Test Methods for Carbon Black—pH Value

SIGNIFICANCE AND USE
3.1 The pH level of a carbon black is known to affect the vulcanization of some rubber compounds.
SCOPE
1.1 These test methods, Test Method A—Boiling Slurry and Test Method B—Sonic Slurry, are used to indicate the pH of the carbon black surface by measuring the pH of water in contact with the carbon black.
Note 1: The pH of the carbon black is often used in this industry to indicate the relative acidity or alkalinity of carbon black and will be used in the remainder of these test methods to describe this property.
Note 2: Test Method A and Test Method B do not always give the same results.  
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Dec-2014
• 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 D1512-05(2012) - Standard Test Methods for Carbon Black—pH Value
• Effective Date: 01-Jan-2015
• Referred By: ASTM D8466-22 - Standard Guide for Recovered Carbon Black—Carbon Black Test Methods for Testing rCB
• Effective Date: 01-Jan-2015
• Referred By: ASTM D5817-20 - Standard Practice for Carbon Black, Pelleted—Reduction, Blending, and Drying of Gross Samples for Testing
• Effective Date: 01-Jan-2015

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D1512 − 15
StandardTest Methods for
1
Carbon Black—pH Value
This standard is issued under the fixed designation D1512; 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 U.S. Department of Defense.
1. Scope TEST METHOD A—BOILING SLURRY
1.1 These test methods,Test MethodA—Boiling Slurry and
4. Apparatus
Test Method B—Sonic Slurry, are used to indicate the pH of
4.1 pH Meter, (digital is recommended) having an accuracy
the carbon black surface by measuring the pH of water in
of 60.05 pH and equipped with a combination electrode and
contact with the carbon black.
RNC connector.
NOTE 1—The pH of the carbon black is often used in this industry to
3
4.2 Container, stainless steel or copper, 125 cm or larger.
indicate the relative acidity or alkalinity of carbon black and will be used
in the remainder of these test methods to describe this property.
4.3 Hot Plate.
NOTE 2—Test Method A and Test Method B do not always give the
same results.
4.4 High Speed Mill, Mixer or Mortar and Pestle.
3
1.2 The values stated in SI units are to be regarded as the
4.5 Beakers, glass, 100 cm graduated with watch glasses.
standard. The values in parentheses are for information only.
5. Reagents
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5.1 Purity of Reagents—Reagent grade chemicals shall be
responsibility of the user of this standard to establish appro-
used in all tests. Unless otherwise indicated, it is intended that
priate safety and health practices and determine the applica-
all reagents shall conform to the specifications of the Commit-
bility of regulatory limitations prior to use.
tee onAnalytical Reagents of theAmerican Chemical Society,
3
where such specifications are available. Other grades may be
2. Referenced Documents
used, provided it is first ascertained that the reagent is of
2
2.1 ASTM Standards:
sufficiently high purity to permit its use without lessening the
D1193 Specification for Reagent Water
accuracy of the determination.
D1799 Practice for Carbon Black—Sampling Packaged
5.2 Purity of Water—Unless otherwise indicated, references
Shipments
to water shall be understood to mean reagent water as defined
D1900 Practice for Carbon Black—Sampling Bulk Ship-
by Type 1 in Specification D1193.
ments
5.3 Distilled Water, high purity.
D4483 Practice for Evaluating Precision for Test Method
Standards in the Rubber and Carbon Black Manufacturing
5.4 Buffer Solutions, pH of 4.00, 7.00, and 10.00.
Industries
5.5 Acetone, reagent grade.
E70 Test Method for pH of Aqueous Solutions With the
Glass Electrode
6. Sampling
3. Significance and Use
6.1 Samples shall be taken in accordance with Practices
D1799 or D1900.
3.1 The pH level of a carbon black is known to affect the
vulcanization of some rubber compounds.
7. Calibration
1
7.1 Calibrate the pH meter using buffer solutions according
These test methods are under the jurisdiction of ASTM Committee D24 on
Carbon Black and are the direct responsibility of Subcommittee D24.31 on
to manufacturer’s instructions.
Non-Carbon Black Components of Carbon Black.
Current edition approved Jan. 1, 2015. Published February 2015. Originally
3
approved in 1975. Last previous edition approved in 2012 as D1512 – 05 (2012). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/D1512-15. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
the ASTM website. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D1512 − 15
TABLE 1 Precision Parameters for ASTM D1512, Carbon Black -- pH Value, Method A, (Type 1 Precision)
Units pH Units
Material Period Number of Laboratories Mean Level Sr r SR R
HS Tread Fall 2003 22 6.2 0.15 0.43 0.73 2.07
SRB A6 (N134) Fall 2004 23 6.5 0.15 0.41 0.53 1.49
LS Carcass Spring 2004 26 7.2 0.14 0.39 0.50 1.41
SRB C6 (N326) Spring 2003 27 8.5 0.11 0.32 0.50 1.41
N774 Fall 2002 19 8.6 0.16 0.45 0.62
...

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: D1512 − 05 (Reapproved 2012) D1512 − 15
Standard Test Methods for
1
Carbon Black—pH Value
This standard is issued under the fixed designation D1512; 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 U.S. Department of Defense.
1. Scope
1.1 These test methods, Test Method A—Boiling Slurry and Test Method B—Sonic Slurry, are used to indicate the pH of the
carbon black surface by measuring the pH of water in contact with the carbon black.
NOTE 1—The pH of the carbon black is often used in this industry to indicate the relative acidity or alkalinity of carbon black and will be used in the
remainder of these test methods to describe this property.
NOTE 2—Test Method A and Test Method B do not always give the same results.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
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
E70 Test Method for pH of Aqueous Solutions With the Glass Electrode
3. Significance and Use
3.1 The pH level of a carbon black is known to affect the vulcanization of some rubber compounds.
TEST METHOD A—BOILING SLURRY
4. Apparatus
4.1 pH Meter, (digital is recommended) having an accuracy of 60.05 pH and equipped with a combination electrode and RNC
connector.
3
4.2 Container, stainless steel or copper, 125 cm or larger.
4.3 Hot Plate.
4.4 High Speed Mill, Mixer or Mortar and Pestle.
3
4.5 Beakers, glass, 100 cm graduated with watch glasses.
5. Reagents
5.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where
1
These test methods are under the jurisdiction of ASTM Committee D24 on Carbon Black and are the direct responsibility of Subcommittee D24.31 on Non-Carbon Black
Components of Carbon Black.
Current edition approved June 1, 2012Jan. 1, 2015. Published November 2012February 2015. Originally approved in 1975. Last previous edition approved in 20052012
as D1512 – 05.D1512 – 05 (2012). DOI: 10.1520/D1512-05R12.10.1520/D1512-15.
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 ----------------------
D1512 − 15
3
such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high
purity to permit its use without lessening the accuracy of the determination.
5.2 Purity of Water—Unless otherwise indicated, references to water shall be understood to mean reagent water as defined by
Type 1 in Specification D1193.
5.3 Distilled Water, high purity.
5.4 Buffer Solutions, pH of 4.00, 7.00, and 10.00.
5.5 Acetone, reagent grade.
6. Sampling
6.1 Samples shall be taken in accordance with Practices D1799 or D1900.
7. Calibration
7.1 Calibrate the pH meter using buffer solutions according to manufacturer’s instructions.
8. Procedure
8.1 Pulverize pelleted or lumpy carbon black to a fine powder, using either the high speed mixer or mortar and pestle.
3
8.2 Weigh 5 g of carbon black into a 100 cm glass beaker.
3
8.3 Add 50 cm of boiling, distilled water prepared in a stainless steel beaker and 2 to 3 drops of acetone to facilitate wetting
of the sample.
NOTE 3—A stainless steel beaker is used to eliminate contamination during boiling.
8.4 Cover the gl
...