ASTM D1512-95(2000)
(Test Method)Standard Test Methods for Carbon Black-pH Value
Standard Test Methods for Carbon Black-pH Value
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.
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Designation:D1512–95 (Reapproved 2000)
Standard Test Methods for
Carbon Black—pH Value
This standard is issued under the fixed designation D 1512; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the 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
4.2 Container, stainless steel or copper, 125 cm or larger.
indicate the relative acidity or alkalinity of carbon black and will be used
4.3 Hot Plate.
in the remainder of these test methods to describe this property.
4.4 High Speed Mill, Mixer or Mortar and Pestle.
NOTE 2—Test Method A and Test Method B do not always give the
4.5 Beakers, glass, 100 cm graduated with watch glasses.
same results.
1.2 The values stated in SI units are to be regarded as the
5. Reagents
standard. The values in parentheses are for information only.
5.1 Purity of Reagents—Reagent grade chemicals shall be
1.3 This standard does not purport to address all of the
used in all tests. Unless otherwise indicated, it is intended that
safety concerns, if any, associated with its use. It is the
all reagents shall conform to the specifications of the Commit-
responsibility of the user of this standard to establish appro-
tee onAnalytical Reagents of theAmerican Chemical Society,
priate safety and health practices and determine the applica-
where such specifications are available. Other grades may be
bility of regulatory limitations prior to use.
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
2. Referenced Documents
accuracy of the determination.
2.1 ASTM Standards:
5.2 Purity of Water— Unless otherwise indicated, refer-
D 1193 Specification for Reagent Water
ences to water shall be understood to mean reagent water as
D 1799 Practice for Carbon Black—Sampling Packaged
defined by Type 1 in Specification D 1193.
Shipments
5.3 Distilled Water, high purity.
D 1900 Practice for Carbon Black—Sampling Bulk Ship-
5.4 Buffer Solutions, pH of 4.00, 7.00, and 10.00.
ments
5.5 Acetone, reagent grade.
D 4483 Practice for Determining Precision for Test Method
Standards in the Rubber and Carbon Black Industries
6. Sampling
E 70 Test Method for pH of Aqueous Solutions with the
6.1 Samples shall be taken in accordance with Practices
Glass Electrode
D 1799 or D 1900.
3. Significance and Use
7. Procedure
3.1 The pH level of a carbon black is known to affect the
7.1 Pulverize pelleted or lumpy carbon black to a fine
vulcanization of some rubber compounds.
powder, using either the high speed mixer or mortar and pestle.
7.2 Weigh5gof carbon black into a 100 cm glass beaker.
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. Reagent Chemicals, American Chemical Society Specifications, American
Current edition approved Sept. 10, 1995. Published November 1995. Originally Chemical Society, Washington, DC. For suggestions on the testing of reagents not
published as D 1512 – 75. Last previous edition D 1512 – 94. listed by the American Chemical Society, see Analar Standards for Laboratory
Annual Book of ASTM Standards, Vol 11.01. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Annual Book of ASTM Standards, Vol 09.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
Annual Book of ASTM Standards, Vol 15.05. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D1512–95 (2000)
7.3 Add 50 cm of boiling, distilled water prepared in a results (or determinations) produced in separate laboratories
stainless steel beaker and 2 to 3 drops of acetone to facilitate that differ by more than 1.53 pH units must be considered as
wetting of the sample. suspect and dictates that appropriate investigative or technical/
commercial actions be taken.
NOTE 3—A stainless steel beaker is used to eliminate contamination
9.2 Bias—In test method terminology, bias is the difference
during boiling.
between average test value and the reference (true) test
7.4 Cover the glass beaker with a watch glass and boil the
property value. Reference values do not exist for this test
mixture for 15 min, but do not allow all the liquid to evaporate.
method since the value or level of the test property is
7.5 Let the mixture cool to room temperature in an atmo-
exclusively defined by the test method. Bias, therefore, cannot
sphere free from chemical fumes which might contaminate the
be determined.
sample.
7.6 Standardize the pH meter with the buffer solutions.
TEST METHOD B—SONIC SLURRY
Rinse the electrode with distilled water and wipe clean after
10. Apparatus
each test.
7.7 Place the electrode in the sludge, rotate gently in
10.1 pH Meter, (digital is recommended) having an accu-
alternate directions until a constant pH is obtained, and record
racy of 6 0.05 pH and equipped with a combination electrode
the pH to the nearest 0.05 unit.
and RNC connector.
10.2 Container, stainless steel or copper, 125 cm or larger.
NOTE 4—Refer to Test Method E 70 for a definition of pH and a highly
10.3 Ultrasonic Stirring Bath , two-position.
detailed procedure for making pH measurements.
3 1
10.4 Magnetic Spinbars, 4.8 mm ( ⁄16 in.) or 6.4 mm ( ⁄4 in.)
7.8 Rinse the electrode with distilled water and wipe clean.
by 22.4 mm ( ⁄8 in.) long, coated with a fluorocarbon polymer,
Keep the electrode soaking in distilled water when not in use.
such as TFE-fluorocarbon.
8. Report 10.5 Beakers, glass, 30 cm graduated with watch glasses.
8.1 Report the following information:
11. Reagents
8.1.1 Proper identification of the sample,
11.1 Purity of Reagents—Reagent grade chemicals shall be
8.1.2 Result obtained, reported to the nearest 0.05 unit, and
used in all tests. Unless otherwise indicated, it is intended that
8.1.3 Test Method used, A or B.
all reagents shall conform to the specifications of the Commit-
9. Precision and Bias
tee onAnalytical Reagents of theAmerican Chemical Society,
where such specifications are available. Other grades may be
9.1 Test Method A:
used, provided it is first ascertained that the reagent is of
9.1.1 This precision and bias has been prepared in accor-
sufficiently high purity to permit its use without lessening the
dance with Practice D 4483. Refer to this practice for termi-
accuracy of the determination.
nology and other statistical details.
11.2 Purity of Water— Unless otherwise indicated, refer-
9.1.2 The precision results in this precision and bias give an
ences to water shall be understood to mean reagent water as
estimate of the precision as described in the following para-
defined by Type 1 in Specification D 1193.
graphs. The precision parameters should not be used for
11.3 Distilled Water, high-purity.
acceptance/rejection testing of any group of materials without
11.4 Buffer S
...
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