ASTM D3493-06e1

Standard Test Method for Carbon Black-Oil Absorption Number of Compressed Sample (COAN)

SCOPE
1.1 This test method covers the procedure for the mechanical compression of a carbon black sample and the determination of the oil absorption number of the compressed sample.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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: 30-Jun-2006
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.11 - Carbon Black Structure

Relations

• Replaces: ASTM D3493-06 - Standard Test Method for Carbon Black-Oil Absorption Number of Compressed Sample (COAN)
• Effective Date: 01-Jul-2006
• Replaced By: ASTM D3493-07 - Standard Test Method for Carbon Black-Oil Absorption Number of Compressed Sample (COAN)
• Effective Date: 01-Jul-2007
• Referred By: ASTM D4821-20 - Standard Guide for Carbon Black—Validation of Test Method Precision and Bias
• Effective Date: 01-Jul-2006
• Referred By: ASTM D1765-23a - Standard Classification System for Carbon Blacks Used in Rubber Products
• Effective Date: 01-Jul-2006
• Referred By: ASTM D6915-23 - Standard Practice for Carbon Black—Evaluation of Standard Reference Blacks
• Effective Date: 01-Jul-2006
• Referred By: ASTM D5817-20 - Standard Practice for Carbon Black, Pelleted—Reduction, Blending, and Drying of Gross Samples for Testing
• Effective Date: 01-Jul-2006
• Referred By: ASTM D3053-23 - Standard Terminology Relating to Carbon Black
• Effective Date: 01-Jul-2006
• Referred By: ASTM D7854-21 - Standard Test Method for Carbon Black-Void Volume at Mean Pressure
• Effective Date: 01-Jul-2006
• Referred By: ASTM D4122-17(2023) - Standard Practice for Carbon Black—Evaluation of an Industry Reference Black
• Effective Date: 01-Jul-2006
• Referred By: ASTM D7849-23 - Standard Classification for Nomenclature of Reference Materials of Committee D24
• Effective Date: 01-Jul-2006

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
e1
Designation:D3493–06
Standard Test Method for
Carbon Black—Oil Absorption Number of Compressed
1
Sample (COAN)
This standard is issued under the fixed designation D3493; 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 (e) indicates an editorial change since the last revision or reapproval.
1
e NOTE—Editorially corrected 9.5.2 in September 2006.
1. Scope Standards in the Rubber and Carbon Black Manufacturing
Industries
1.1 This test method covers the procedure for the mechani-
cal compression of a carbon black sample and the determina-
3. Summary of Test Method
tion of the oil absorption number of the compressed sample.
3.1 Asample of carbon black is compressed four times in a
1.2 The values stated in SI units are to be regarded as the
compression cylinder at a pressure of 165 MPa (24 000 psi)
standard. The values given in parentheses are for information
and then tested in an absorptometer to determine the oil
only.
absorption number.
1.3 This standard does not purport to address all of the
3.2 n-Dibutyl phthalate or paraffin oil is added by means of
safety concerns, if any, associated with its use. It is the
aconstant-rateburettothecompressedsampleofcarbonblack
responsibility of the user of this standard to establish appro-
in the mixer chamber of an absorptometer. As the sample
priate safety and health practices and determine the applica-
absorbs the oil, the mixture changes from a free-flowing state
bility of regulatory limitations prior to use.
to one of a semiplastic agglomeration, with an accompanying
2. Referenced Documents increase in viscosity. This increased viscosity is transmitted to
2
the torque-sensing system of the absorptometer. When the
2.1 ASTM Standards:
viscosity of the mixture reaches a predetermined torque level,
D1765 Classification System for Carbon Blacks Used in
the absorptometer and buret will simultaneously shut off. The
Rubber Products
volume of oil added is read from the direct reading buret. The
D1799 Practice for Carbon Black—Sampling Packaged
volume of oil per unit mass of carbon black is the oil
Shipments
absorption number. Either DBPor paraffin oil is acceptable for
D1900 Practice for Carbon Black—Sampling Bulk Ship-
use with many standard pelleted grades of N-series carbon
ments
blacks found in Classification D1765. COAN testing using
D2414 Test Method for Carbon Black—Oil Absorption
paraffin oil on some specialty blacks and powder blacks may
Number (OAN)
result in significant differences when compared to COAN
D 4821 Guide for Carbon Black—Validation of Test
testing using DBP oil. Referee testing between suppliers and
Method Precision and Bias
users should use DBPoil until such time that precision data is
D4483 Practice for Evaluating Precision for Test Method
available for paraffin oil.
4. Significance and Use
1
This test method is under the jurisdiction ofASTM Committee D24 on Carbon
4.1 Theoilabsorptionnumberofacarbonblackisrelatedto
Black and is the direct responsibility of Subcommittee D24.11 on Carbon Black
theprocessingandvulcanizatepropertiesofrubbercompounds
Structure.
containing the carbon black.
CurrenteditionapprovedJuly1,2006.PublishedJuly2006.Originallyapproved
in 1976. Last previous edition approved in 2004 as D3493–04a.
4.2 The difference between the regular oil absorption num-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ber and the oil absorption number of compressed sample is
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
some measure of the stability of the structure of the carbon
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. black.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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e1
D3493–06
3
5. Apparatus 8. Calibration and Standardization
5.1 Balance, analytical, 0.01-g sensitivity. 8.1 See Test Method D2414.
5.2 Oven, gravity-convection type, capable of maintaining
NOTE 1—If values are not obtained within the acceptable range, it will
125°C 6 5°C.
be necessary to either vary the pressure of the hydraulic press until
5.3 Carbon Black Press, capable of compressing a 25-g
acceptable values are obtained or follow Guide D4821.
4
sample to 165 MPa (24 000 psi).
5
5.4 Absorptometer, equippedwithaconstant-rateburetthat 9. Procedure
3 3
delivers 67 6 0.4 mm /s (4 6 0.024 cm /min).
9.1 Dry an adequate sample for1hina specified oven set
5.5 Spatula, rubber, 100 mm.
at 125°C. Cool the sample in a desiccator for a minimum of
5.6 Sieve, 850 µm (U.S. No. 20), approximately 125-mm
30min prior to testin
...