ASTM D2797/D2797M-21a

Standard Practice for Preparing Coal Samples for Microscopical Analysis by Reflected Light

SIGNIFICANCE AND USE
4.1 Briquets of granular bituminous coals and anthracite prepared in accordance with the laboratory procedures of this practice will have flat, scratch-free surfaces suitable for examination with a microscope using reflected light illumination. The polished surfaces of briquettes prepared by this practice will contain particles representative of the original gross sample.  
4.2 Samples prepared by this practice are used for microscopical determination of the reflectance of the organic components in a polished specimen of coal (Test Method D2798) and for microscopical determination of the volume percent of physical components of coal (Test Method D2799).
SCOPE
1.1 This practice covers laboratory procedures for the preparation of granular samples of bituminous coal and anthracite samples for examination with a microscope using reflected light illumination. It does not apply to the preparation of oriented blocks of coal.  
1.2 Units—The values stated in either SI units or non-SI units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Aug-2021
• ICS: 73.040 - Coals
• Technical Committee: D05 - Coal and Coke
• Drafting Committee: D05.28 - Petrographic Analysis of Coal and Coke

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D2797/D2797M −21a
Standard Practice for
Preparing Coal Samples for Microscopical Analysis by
1
Reflected Light
This standard is issued under the fixed designation D2797/D2797M; 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.
1. Scope Maceral Composition of Coal
D4596Practice for Collection of Channel Samples of Coal
1.1 This practice covers laboratory procedures for the
in a Mine
preparationofgranularsamplesofbituminouscoalandanthra-
E11Specification forWovenWireTest Sieve Cloth andTest
citesamplesforexaminationwithamicroscopeusingreflected
Sieves
light illumination. It does not apply to the preparation of
oriented blocks of coal.
3. Summary of Practice
1.2 Units—The values stated in either SI units or non-SI
3.1 Arepresentativesampleiscrushedtoaspecifiedparticle
units are to be regarded separately as standard. The values
size, air-dried, mixed with a binder, and formed into a briquet.
stated in each system are not necessarily exact equivalents;
The briquet is then polished to a flat, scratch-free surface for
therefore, to ensure conformance with the standard, each
examination by vertical illumination.
system shall be used independently of the other, and values
from the two systems shall not be combined.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 Briquets of granular bituminous coals and anthracite
safety concerns, if any, associated with its use. It is the
prepared in accordance with the laboratory procedures of this
responsibility of the user of this standard to establish appro-
practicewillhaveflat,scratch-freesurfacessuitableforexami-
priate safety, health, and environmental practices and deter-
nation with a microscope using reflected light illumination.
mine the applicability of regulatory limitations prior to use.
The polished surfaces of briquettes prepared by this practice
1.4 This international standard was developed in accor-
will contain particles representative of the original gross
dance with internationally recognized principles on standard-
sample.
ization established in the Decision on Principles for the
4.2 Samples prepared by this practice are used for micro-
Development of International Standards, Guides and Recom-
scopical determination of the reflectance of the organic com-
mendations issued by the World Trade Organization Technical
ponents in a polished specimen of coal (Test Method D2798)
Barriers to Trade (TBT) Committee.
and for microscopical determination of the volume percent of
physical components of coal (Test Method D2799).
2. Referenced Documents
2
2.1 ASTM Standards:
5. Apparatus
D2013Practice for Preparing Coal Samples for Analysis
5.1 Grinder, Pulverizer, or Mill, for final crushing of the
D2234/D2234MPractice for Collection of a Gross Sample
sample to pass a 850µm [No. 20] U.S. Standard Sieve. Mortar
of Coal
and pestle or other equipment suitable for reducing the particle
D2798Test Method for Microscopical Determination of the
size of a 250g sample that already passes a 4.75mm [No. 4]
Vitrinite Reflectance of Coal
U.S. Standard Sieve until all of it passes a 850µm [No. 20]
D2799Test Method for Microscopical Determination of the
U.S. Standard Sieve (see 6.5).
5.2 Coarse Riffle Sampler—A riffle with at least twelve
1
This practice is under the jurisdiction of ASTM Committee D05 on Coal and
1
divisions of not less than 12.7 mm [ ⁄2 in.] and not greater than
Coke and is the direct responsibility of Subcommittee D05.28 on Petrographic
3
19.1 mm [ ⁄4 in.].
Analysis of Coal and Coke.
Current edition approved Sept. 1, 2021. Published September 2021. Originally
5.3 Fine Riffle Sampler—A riffle with at least twelve divi-
approved in 1969. Last previous edition approved in 2021 as D2797/D2797M–21.
1
sions of not less than 3.2 mm [ ⁄8 in.] and not greater than
DOI: 10.1520/D2797_D2797M-21A.
2 1
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6.4mm [ ⁄4 in.].
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
5.4 Sieves—A4.75mm [No. 4] and a 850µm [No. 20] U.S.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Standard Sieve (Specification E11).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D2797/D2797M−21a
5.5 Molds—Containers to hold the coal binder mixture
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D2797/D2797M − 21 D2797/D2797M − 21a
Standard Practice for
Preparing Coal Samples for Microscopical Analysis by
1
Reflected Light
This standard is issued under the fixed designation D2797/D2797M; 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.
1. Scope
1.1 This practice covers laboratory procedures for the preparation of granular samples of bituminous coal and anthracite samples
for examination with a microscope using reflected light illumination. It does not apply to the preparation of oriented blocks of coal.
1.2 Units—The values stated in either SI units or non-SI units are to be regarded separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D2013 Practice for Preparing Coal Samples for Analysis
D2234/D2234M Practice for Collection of a Gross Sample of Coal
D2798 Test Method for Microscopical Determination of the Vitrinite Reflectance of Coal
D2799 Test Method for Microscopical Determination of the Maceral Composition of Coal
D4596 Practice for Collection of Channel Samples of Coal in a Mine
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
3. Summary of Practice
3.1 A representative sample is crushed to a specified particle size, air-dried, mixed with a binder, and formed into a briquet. The
briquet is then polished to a flat, scratch-free surface for examination by vertical illumination.
4. Significance and Use
4.1 Briquets of granular bituminous coals and anthracite prepared in accordance with the laboratory procedures of this practice
1
This practice is under the jurisdiction of ASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.28 on Petrographic Analysis
of Coal and Coke.
Current edition approved May 15, 2021Sept. 1, 2021. Published May 2021September 2021. Originally approved in 1969. Last previous edition approved in 20202021 as
D2797/D2797M – 20a.D2797/D2797M – 21. DOI: 10.1520/D2797_D2797M-21.10.1520/D2797_D2797M-21A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D2797/D2797M − 21a
will have flat, scratch-free surfaces suitable for examination with a microscope using reflected light illumination. The polished
surfaces of briquettes prepared by this practice will contain particles representative of the original gross sample.
4.2 Samples prepared by this practice are used for microscopical determination of the reflectance of the organic components in
a polished specimen of coal (Test Method D2798) and for microscopical determination of the volume percent of physical
components of coal (Test Method D2799).
5. Apparatus
5.1 Grinder, Pulverizer, or Mill, for final crushing of the sample to pass a 850 μm [No. 20] U.S. Standard Sieve. Mortar and pestle
or other equipment suitable for reducing the particle size of a 250 g sample that already passes a 4.75 mm [No. 4] U.S. Standard
Sieve until all of it passes a 850 μm [No. 20] U.S. Standard Sieve (see 6.5).
1
5.2 Coarse Riffle Sampler—A riffle with at least twelve divisions of not less than 12.7 mm [ ⁄2 in.] and not greater than 19.1 mm
3
[ ⁄4 in.].
1 1
5.3 Fine Riffle Sampler—A riffle with
...