ASTM D3493-01

Standard Test Method for Carbon Black—Oil Absorption Number of Compressed Sample

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.
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: 09-Dec-2001
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.11 - Carbon Black Structure

Relations

• Replaces: ASTM D3493-00a - Standard Test Method for Carbon Black—Oil Absorption Number of Compressed Sample
• Effective Date: 10-Dec-2001
• Replaced By: ASTM D3493-03 - Standard Test Method for Carbon Black—Oil Absorption Number of Compressed Sample
• Effective Date: 10-Jul-2003
• Referred By: ASTM D4821-20 - Standard Guide for Carbon Black—Validation of Test Method Precision and Bias
• Effective Date: 10-Dec-2001
• Referred By: ASTM D7849-23 - Standard Classification for Nomenclature of Reference Materials of Committee D24
• Effective Date: 10-Dec-2001
• Referred By: ASTM D4122-17(2023) - Standard Practice for Carbon Black—Evaluation of an Industry Reference Black
• Effective Date: 10-Dec-2001
• Referred By: ASTM D1765-23a - Standard Classification System for Carbon Blacks Used in Rubber Products
• Effective Date: 10-Dec-2001
• Referred By: ASTM D6915-23 - Standard Practice for Carbon Black—Evaluation of Standard Reference Blacks
• Effective Date: 10-Dec-2001
• Referred By: ASTM D3053-23 - Standard Terminology Relating to Carbon Black
• Effective Date: 10-Dec-2001
• Referred By: ASTM D5817-20 - Standard Practice for Carbon Black, Pelleted—Reduction, Blending, and Drying of Gross Samples for Testing
• Effective Date: 10-Dec-2001
• Referred By: ASTM D7854-21 - Standard Test Method for Carbon Black-Void Volume at Mean Pressure
• Effective Date: 10-Dec-2001

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 3493 – 01
Standard Test Method for
Carbon Black—Oil Absorption Number of Compressed
1
Sample
This standard is issued under the fixed designation D 3493; 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.
1. Scope in the mixer chamber of an absorptometer. As the sample
absorbs the oil, the mixture changes from a free-flowing state
1.1 This test method covers the procedure for the mechani-
to one of a semiplastic agglomeration, with an accompanying
cal compression of a carbon black sample and the determina-
increase in viscosity. This increased viscosity is transmitted to
tion of the oil absorption number of the compressed sample.
the torque-sensing system of the absorptometer. When the
1.2 The values stated in SI units are to be regarded as the
viscosity of the mixture reaches a predetermined torque level,
standard. The values given in parentheses are for information
the absorptometer and buret will simultaneously shut off. The
only.
volume of oil added is read from the direct reading buret. The
1.3 This standard does not purport to address all of the
volume of oil per unit mass of carbon black is the oil
safety concerns, if any, associated with its use. It is the
absorption number. Referee testing between suppliers and
responsibility of the user of this standard to establish appro-
users should use DBP oil until such time that precision data is
priate safety and health practices and determine the applica-
available for paraffin oil.
bility of regulatory limitations prior to use.
4. Significance and Use
2. Referenced Documents
4.1 The oil absorption number of a carbon black is related to
2.1 ASTM Standards:
the processing and vulcanizate properties of rubber compounds
D 1799 Practice for Carbon Black—Sampling Packaged
2
containing the carbon black.
Shipments
4.2 The difference between the regular oil absorption num-
D 1900 Practice for Carbon Black—Sampling Bulk Ship-
2
ber and the oil absorption number of compressed sample is
ments
some measure of the stability of the structure of the carbon
D 2414 Test Method for Carbon Black—n-Dibutyl Phtha-
2
black.
late Absorption Number
D 3324 Practice for Carbon Black—Improving Test Repro-
3
5. Apparatus
2
ducibility Using ASTM Reference Blacks
5.1 Balance, analytical, 0.01-g sensitivity.
D 3493 Test Method for Carbon Black—Oil Absorption
2 5.2 Oven, gravity-convection type, capable of maintaining
Number of Compressed Sample
125° 6 5°C.
D 4821 Guide for Carbon Black—Validation of Test
2 5.3 Carbon Black Press, capable of compressing a 25 g
Method Precision and Bias
4
sample to 165 MPa (24 000 psi).
D 4483 Practice for Determining Precision for Test Method
5
2 5.4 Absorptometer, equipped with a constant-rate buret
Standards in the Rubber and Carbon Black Industries
3 3
which delivers 67 6 0.4 mm /s (4 6 0.024 cm /min).
3. Summary of Test Method 5.5 Spatula, rubber, 100-mm.
5.6 Sieve, 850 μm (U.S. No. 20), approximately 125-mm
3.1 A sample of carbon black is compressed four times in a
(5-in.) diameter with receiver pan.
compression cylinder at a pressure of 165 MPa (24 000 psi)
5.7 Brush, approximately 40-mm (1.5-in.), stiff bristle.
and then tested in an absorptometer to determine the oil
5.8 Desiccator.
absorption number.
3.2 n -Dibutyl phthalate or paraffin oil is added by means of
a constant-rate buret to the compressed sample of carbon black
3
All apparatus is to be operated and maintained in accordance with the
manufacturer’s directions for optimum performance.
1 4
This test method is under the jurisdiction of ASTM Committee D24 on Carbon Carbon black presses from the following companies have been found satisfac-
Black and is the direct responsibility of Subcommittee D24.11 on Absorptive tory for this test method: EG&G Engineering, P.O. Box 470710, Tulsa, OK
Properties of Carbon Black. 74147–0710 and Titan Specialties, Inc., P.O. Box 2316, Pampa, TX 79066-2316.
5
Current edition approved Dec. 10, 2001. Published February 2002. Originally Available from C. W. Brabender Instruments, Inc., 50 E. Wesley St., South
published as D 3493-76. Last previous edition D 3493-00a. Hackensack, NJ 07606 and from HITEC Luxembourg, 5 Rue de l’Eglise, L-1458,
2
Annual Book of ASTM Standards, Vol 09.01. Luxembourg.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 349
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