ASTM D1512-15a

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-Aug-2015
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.31 - Non-Carbon Black Components of Carbon Black

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 − 15a
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
contact with the carbon black. of 60.05 pH and equipped with a combination electrode and
RNC connector.
NOTE 1—The pH of the carbon black is often used in this industry to
3
indicate the relative acidity or alkalinity of carbon black and will be used
4.2 Container, stainless steel or copper, 125 cm or larger.
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.
1.2 The values stated in SI units are to be regarded as the
3
4.5 Beakers, glass, 100 cm graduated with watch glasses.
standard. The values in parentheses are for information only.
4.6 Magnetic Stir Plate.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4.7 Magnetic Stir Bars.
responsibility of the user of this standard to establish appro-
5. Reagents
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
2. Referenced Documents
all reagents shall conform to the specifications of the Commit-
2
2.1 ASTM Standards:
tee onAnalytical Reagents of theAmerican Chemical Society,
D1193 Specification for Reagent Water 3
where such specifications are available. Other grades may be
D1799 Practice for Carbon Black—Sampling Packaged
used, provided it is first ascertained that the reagent is of
Shipments
sufficiently high purity to permit its use without lessening the
D1900 Practice for Carbon Black—Sampling Bulk Ship-
accuracy of the determination.
ments
5.2 Purity of Water—Unless otherwise indicated, references
D4483 Practice for Evaluating Precision for Test Method
to water shall be understood to mean reagent water as defined
Standards in the Rubber and Carbon Black Manufacturing
by Type 1 in Specification D1193.
Industries
E70 Test Method for pH of Aqueous Solutions With the
5.3 Distilled Water, high purity.
Glass Electrode
5.4 Buffer Solutions, pH of 4.00, 7.00, and 10.00.
3. Significance and Use
5.5 Acetone, reagent grade.
3.1 The pH level of a carbon black is known to affect the
6. Sampling
vulcanization of some rubber compounds.
6.1 Samples shall be taken in accordance with Practices
1
These test methods are under the jurisdiction of ASTM Committee D24 on
D1799 or D1900.
Carbon Black and are the direct responsibility of Subcommittee D24.31 on
Non-Carbon Black Components of Carbon Black.
Current edition approved Sept. 1, 2015. Published December 2015. Originally
3
approved in 1975. Last previous edition approved in 2015 as D1512 – 15. DOI: Reagent Chemicals, American Chemical Society Specifications, American
10.1520/D1512-15A. 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
1

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D1512 − 15a
7. Calibration 10.1.2 The precision results in this precision and bias
section give an estimate of the precision of this test method
7.1 Calibrate the pH meter using buffer solutions according
with the materials used in the particular interlaboratory pro-
to manufacturer’s instructions.
gram described below. The precision parameters should not be
used for acceptance or rejection testing of any group of
8. Procedure
materials without documentation that they are applicab
...

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 − 15 D1512 − 15a
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.
4.6 Magnetic Stir Plate.
4.7 Magnetic Stir Bars.
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 Jan. 1, 2015Sept. 1, 2015. Published February 2015December 2015. Originally approved in 1975. Last previous edition approved in 20122015
as D1512 – 05 (2012).D1512 – 15. DOI: 10.1520/D1512-15.10.1520/D1512-15A.
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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D1512 − 15a
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
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
...