ASTM C886-98(2010)e1

Standard Test Method for Scleroscope Hardness Testing of Carbon and Graphite Materials

SIGNIFICANCE AND USE
The scleroscope is a rebound hardness tester with a scale divided into 140 equal parts. For carbon and graphite materials, there is no established correlation between the Scleroscope hardness scale and other hardness scales. The test is useful in the evaluation and the manufacturing control of carbon and graphite materials.
SCOPE
1.1 This test method covers the apparatus and procedure for determining the hardness of carbon and graphite materials using the Model C-2 scleroscope with the hammer calibrated for use on carbon and graphite materials with particles smaller than 0.8 mm.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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: 30-Apr-2010
• ICS: 71.100.99 - Other products of the chemical industry
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.F0 - Manufactured Carbon and Graphite Products

Relations

• Replaces: ASTM C886-98(2005) - Standard Test Method for Scleroscope Hardness Testing of Carbon and Graphite Materials
• Effective Date: 01-May-2010
• Referred By: ASTM D7775-21 - Standard Guide for Measurements on Small Graphite Specimens
• Effective Date: 01-May-2010

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
´1
Designation: C886 − 98(Reapproved 2010) An American National Standard
Standard Test Method for
Scleroscope Hardness Testing of Carbon and Graphite
Materials
This standard is issued under the fixed designation C886; 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.
´ NOTE—Updated units of measurement throughout standard editorially in May 2010.
1. Scope 3. Summary of Test Method
1.1 This test method covers the apparatus and procedure for 3.1 The specimen is held in position, and the height of
determining the hardness of carbon and graphite materials reboundofadiamond-tippedhammerisobservedandrecorded
using the Model C-2 scleroscope with the hammer calibrated as the hardness number.
for use on carbon and graphite materials with particles smaller
4. Significance and Use
than 0.8 mm.
4.1 Thescleroscopeisareboundhardnesstesterwithascale
1.2 The values stated in SI units are to be regarded as
dividedinto140equalparts.Forcarbonandgraphitematerials,
standard. No other units of measurement are included in this
there is no established correlation between the Scleroscope
standard.
hardness scale and other hardness scales. The test is useful in
1.3 This standard does not purport to address all of the
the evaluation and the manufacturing control of carbon and
safety concerns, if any, associated with its use. It is the
graphite materials.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Interferences
bility of regulatory limitations prior to use.
5.1 Lack of alignment of the instrument, as specified in
2. Referenced Documents
Section 10, will cause low readings.
2.1 ASTM Standards:
5.2 The specimen must be held firmly in position and must
E171 Practice for Conditioning and Testing Flexible Barrier
have adequate support from the anvil on which the sample
Packaging
rests. Neglect of alignment, positioning, or support will result
E448 Practice for Scleroscope Hardness Testing of Metallic
in low readings.
Materials
5.3 Rough surface finish, above 3175-nm AA, may cause
2.2 ANSI Standard:
low readings.
ANSI C 64.1 Brushes for Electrical Machines
5.4 Indentationsthataresuperimposedorspacedtooclosely
together (approximately 3 mm) will cause incorrect readings.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
6. Apparatus
D02.F0 on Manufactured Carbon and Graphite Products.
Current edition approved May 1, 2010. Published May 2010. Originally
6.1 Table, or equivalent, firm, for support.
approved in 1988. Last previous edition approved in 2005 as C886 – 98 (2005).
DOI: 10.1520/C0886-98R10E01.
6.2 Scleroscope, Model C-2, equipped with a hammer
Registered trademark of the Shore Instrument and Manufacturing Co., Inc.,
calibrated by the manufacturer for use on carbon and graphite
80-A Commercial St., Freeport, NY 11520, and available from Instron Worldwide
materials.
Headquarters, 825 University Ave., Norwood, MA 02062, www.instron.com.
This test method may be more readily understood by referring to the following
documents: Practice E448,ANSI C 64.1, Brushes for Electrical Machines, available 7. Test Specimen
fromAmericanNationalStandardsInstitute,1430Broadway,NewYork,NY10017,
7.1 The specimen may be of any convenient size, but test
andLysaghtandDeBellis,IndentationHardnessTesting,AmericanChainandCable
Corp., Reinhold Publishing Co., 1969. surfaces smaller than 5 by 5 mm are not recommended.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.2 The recommended specimen shall have a minimum
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on thickness of 5 mm.
the ASTM website.
7.3 Thetestsurfaceshallnotexceed3175-nmAAinsurface
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
...