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ASTM D6086-97

(Test Method)

Standard Test Methods for Carbon Black--Compressed Volume Index

Standard Test Methods for Carbon Black--Compressed Volume Index

SCOPE
1.1 These test methods cover a procedure to measure a carbon black property called the Compressed Volume Index. This index is the ratio (x100) of two void volumes, the void volume of a sample of a candidate carbon black divided by the void volume of a Standard Reference Black, SRB B5. The void volume is obtained by measuring the compressed volume of a weighted sample contained in a cylindrical chamber when a specified compression force is applied by a movable piston with a displacement transducer on the piston mechanism.  
1.2 The compressed volume index is an important carbon black property that relates to the compounded physical properties for carbon black-filled elastomers.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4 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-1996
ICS
71.060.10 - Chemical elements
Technical Committee
D24 - Carbon Black
Drafting Committee
D24.11 - Carbon Black Structure
Current Stage
Ref Project

Relations

Replaced By
ASTM D6086-05 - Standard Test Method for Carbon Black—Void Volume (VV)
Effective Date
01-May-2005

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ASTM D6086-97 - Standard Test Methods for Carbon Black--Compressed Volume IndexASTM D6086-97 - Standard Test Methods for Carbon Black--Compressed Volume Index
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ASTM D6086-97 - Standard Test Methods for Carbon Black--Compressed Volume Index
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D6086–97
Standard Test Methods for
Carbon Black—Compressed Volume Index
This standard is issued under the fixed designation D6086; 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. Scope 3.1.1 compressed volume (carbon black), n—the volume
that a mass of carbon black occupies when it is contained in a
1.1 These test methods cover a procedure to measure a
specified cylindrical chamber and subjected to a specified
carbon black property called the Compressed Volume Index.
compression force by a movable piston.
This index is the ratio (3100) of two void volumes, the void
3.1.2 compressed volume index (CVI) (carbon black), n—a
volume of a sample of a candidate carbon black divided by the
normalizedvoidvolumedefinedastheratio(3100)ofthevoid
voidvolumeofaStandardReferenceBlack,SRBB5.Thevoid
volume measurements of a candidate carbon black to the void
volume is obtained by measuring the compressed volume of a
volume of a reference carbon black, SRB B5; both void
weighed sample contained in a cylindrical chamber when a
volumes should be obtained in the same instrument under
specified compression force is applied by a movable piston
identical test conditions.
with a displacement transducer on the piston mechanism.
3.1.3 theoretical volume (carbon black), n—thevolumethat
1.2 The compressed volume index is an important carbon
a specific mass of carbon black particles with no voids, for
black property that relates to the compounded physical prop-
practical purposes, is given by the ratio of the mass to the
erties for carbon black-filled elastomers.
density, when the density is determined by an accepted test.
1.3 The values stated in SI units are to be regarded as the
3.1.4 void volume (carbon black), n—a measure of the
standard. The values given in parentheses are for information
irregularity and non-sphericity of carbon black aggregate
only.
particles, it is expressed as the difference, (compressed
1.4 This standard does not purport to address all of the
volume-theoretical volume) for a mass of carbon black, the
safety concerns, if any, associated with its use. It is the
differential volume is normalized to a selected unit mass.
responsibility of the user of this standard to establish appro-
3.1.4.1 Discussion—The aggregate irregularity resists com-
priate safety and health practices and determine the applica-
pression and thus the compressed volume is a function of the
bility of regulatory limitations prior to use.
degree of this irregularity. The compressed and void volumes
2. Referenced Documents are specific to the compressed volume measuring instrument
and to the conditions of test.
2.1 ASTM Standards:
D1509 Test Methods for Carbon Black—Heating Loss
4. Summary of Test Methods
D1799 Practice for Carbon Black—Sampling Packaged
4.1 The compressed volume instrument used for any testing
Shipments
program is adjusted or calibrated by conducting a compression
D1900 Practice for Carbon Black—Sampling Bulk Ship-
operation on a specified mass of the reference carbon black,
ments
SRB B5. This operation adjusts the compression force (pres-
3. Terminology
sure) to give the accepted void volume of this standard carbon
black.
3.1 Definitions of Terms Specific to This Standard—Referto
4.2 Thecompressedvolumeofaweigheddrytestsampleof
Sections 4 and 9 for a more complete understanding of the use
a candidate carbon black is obtained in the same compressed
of these terms in these test methods.
volume instrument under calibration test conditions. From the
compressed volume, the void volume is obtained by subtract-
These test methods are under the jurisdiction of Committee D24 on Carbon
ing the theoretical volume. The compressed volume index is
Black and are the direct responsibility of Subcommittee D24.11 on Carbon Black
obtainedforthecompressedvolumesofcandidateandSRBB5
Structure.
carbon blacks.
Current edition approved March 10, 1997. Published May 1997.
Annual Book of ASTM Standards, Vol 09.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6086–97
5. Significance and Use 8.3 Calibration Test Pressure (SRB B5):
8.3.1 The instrument is set up to conduct tests by adjusting
5.1 Thevoidvolumeofacarbonblackexpressedintermsof
the test end point or calibration pressure to obtain the accepted
a normalized value, the compressed volume index (CVI), is a
standard compressed volume for SRB B5.
carbon black property that reflects differences in structure for
8.3.2 Place 2.500 6 0.001 g of SRB B5 into the sample
candidate carbon blacks. Structure is a generic term that is a
chamber.
functionoftheshapeirregularityanddeviationfromsphericity
8.3.3 Select “Calibrate Pressure” on the instrument control
of carbon black aggregates. The more that a carbon black
device and start the test operation. The piston will move to the
resists compression by having substantial aggregate irregular-
calculated height to attain a calibration compressed volume of
ityandnon-sphericity,thegreaterthecompressedvolume,void
−5 3 −5 3 3
56.60 310 m /kg (10 m/kg=cm /100 g). The height is
volume, and CVI.
held for 20 s and the average pressure is measured. This is
5.2 Structure is a property that influences the physical
repeated two more times for the calibration value of SRB B5.
properties developed in carbon black compounds for use in
The instrument should be calibrated at the beginning of each
tires, mechanical rubber goods, and other manufactured rubber
test group. After the calibration, a SRB B5 should be tested
products.
every 20 tests. A variance of 1.5% from 100 will indicate
6. Apparatus
recalibration is needed.
6.1 Analytical Balance,orequivalent,capableofaweighing
8.4 Evaluating Candidate Carbon Blacks:
sensitivity of 0.1 mg.
8.4.1 Place the dried and weighed candidate black in the
6.2 Gravity Convection Drying Oven, capable of maintain-
calibrated instrument and secure the sample by closing the
ing 125 6 5°C.
gate. Identify the sample (keyboard input) and start the test
6.3 Weighing Dish, Camel Hair Brush, to be used for
sequence to apply the predetermined (calibration) pressure for
weighing the samples.
a period of 20 s.The height of the piston will be automatically
6.4 Fume Hood, with adequate draft.
recorded and u
...

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