ASTM C737-22

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: C737 − 22
Standard Specification for
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Limestone for Dusting of Coal Mines
This standard is issued under the fixed designation C737; 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* C51 Terminology Relating to Lime and Limestone (as Used
by the Industry)
1.1 This specification covers pulverized limestone suitable
C110 Test Methods for Physical Testing of Quicklime,
for use as dust in coal mines to reduce risk of coal dust
Hydrated Lime, and Limestone
explosions.
C1271 Test Method for X-ray Spectrometric Analysis of
NOTE 1—Pulverized limestone can serve as a source of incombustible
Lime and Limestone
material in coal mine operations. Limestone is dusted onto coal exposures
C1301 Test Method for Major and Trace Elements in Lime-
in sufficient amount so that the incombustible content of the combined
stone and Lime by Inductively Coupled Plasma-Atomic
coal dust, rock dust, other dust, and moisture shall not be less than 80 %
Emission Spectroscopy (ICP) and Atomic Absorption
of all loose dust (MSHA 30 CFR 75.403). With such a concentration of
limestone incombustible material, dust explosions cannot initiate or be
(AA)
propagated from nearby gas explosions. The limestone must be substan-
E11 Specification for Woven Wire Test Sieve Cloth and Test
tially dry in order to dust satisfactorily.
Sieves
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1.2 The values stated in SI units are to be regarded as
2.2 Government Regulations:
standard. No other units of measurement are included in this
30 CFR Part 75 Mandatory Safety Standards - Underground
standard.
Coal Mines
1.3 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.1 Definitions:
priate safety, health, and environmental practices and deter- 3.1.1 For definitions of terms used in this specification, refer
mine the applicability of regulatory limitations prior to use.
to Terminology C51.
1.4 This international standard was developed in accor- 3.2 Definitions of Terms Specific to This Standard:
dance with internationally recognized principles on standard-
3.2.1 rock dust—pulverized limestone or other inert materi-
ization established in the Decision on Principles for the
als which meet chemical and physical requirements; when
Development of International Standards, Guides and Recom-
applied to coal dust, will reduce dispersibility and minimize the
mendations issued by the World Trade Organization Technical
explosion hazard. 30 CFR § 75.2.
Barriers to Trade (TBT) Committee.
4. Chemical Composition
2. Referenced Documents
4.1 Limestone shall conform to the following as to chemical
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composition:
2.1 ASTM Standards:
C25 Test Methods for Chemical Analysis of Limestone,
Moisture (at point of manufacture), max, % 0.5
Combustible matter, max, % 5.0
Quicklime, and Hydrated Lime
Silica, free and combined, max, % 4.0
C50 Practice for Sampling, Sample Preparation, Packaging,
NOTE 2—Rock dust sources which do not contain more than 5 % of free
and Marking of Lime and Limestone Products
or combined silica may be used with authorization from the Secretary of
Labor or their designee.
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This specification is under the jurisdiction of ASTM Committee C07 on Lime 5. Physical Properties
and Limestone and is the direct responsibility of Subcommittee C07.02 on
5.1 Limestone for this application shall have the following
Specifications and Guidelines.
Current edition approved July 1, 2022. Published September 2022. Originally particle size:
approved in 1973. Last previous edition approved in 2013 as C737 – 13 which was
Passing 850 μm (No. 20) sieve, min, % 100
withdrawn January 2022 and reinstated in September 2022. DOI: 10.1520/C0737-
Passing 75 μm (No. 200) sieve, min, % 70
22.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available from U.S. Government Publishing Office (GPO), 732 N. Capitol St.,
the ASTM website. NW, Washington, DC 20401, http://www.gpo.gov.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C737 − 22
6. Test Methods 8. Sampling, Ins
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