ASTM C737-22 PDF

Full title and description

ASTM C737-22 — Standard Specification for Limestone for Dusting of Coal Mines. This short specification defines the physical and chemical requirements for pulverized limestone used as rock dust in underground coal mines to reduce the risk of coal‑dust explosions by providing a prescribed minimum incombustible content in loose mine dust.

Abstract

ASTM C737-22 establishes minimum composition and particle-size requirements, and limits on moisture, combustible matter and silica for limestone intended for use as mine rock dust. The standard specifies test and sampling references and clarifies that dusted limestone is intended to increase the incombustible fraction of loose mine dust to the regulatory target so that coal‑dust explosions cannot initiate or propagate. The document is concise (few pages) and intended for manufacturers, mine operators and regulators concerned with safety and compliance.

General information

• Status: Active (current designation: C737-22)
• Publication date: Approved July 1, 2022; published (current edition) in 2022
• Publisher: ASTM International
• ICS / categories: 73.020 (Mining and quarrying)
• Edition / version: C737-22 (current edition, 2022)
• Number of pages: 3 (concise specification)

Scope

This specification covers pulverized limestone suitable for rock dusting in coal mines to reduce the risk of coal‑dust explosions. It sets required particle size distribution and chemical limits so that when applied to mine surfaces the combined incombustible content of loose dust meets regulatory safety targets. The standard does not substitute for regulatory requirements; users must ensure compliance with applicable mine safety regulations (for example the required incombustible fraction in loose dust).

Key topics and requirements

• Intended use: pulverized limestone (rock dust) for coal‑mine dusting to prevent explosion propagation.
• Particle size: minimum passing fractions required (e.g., essentially all material passing 850 μm / No. 20; a high percentage passing 75 μm / No. 200 is specified).
• Chemical limits: maximum allowable moisture, combustible matter (loss on ignition), and silica (free + combined) set to protect effectiveness and reduce respirable silica exposure.
• Typical measured properties called out include moisture (specified maximum), combustible matter (specified maximum), and silica content limits.
• References to ASTM test methods and sampling practices for chemical analysis and particle‑size determination.
• Emphasis on dryness of limestone and suitability for dusting equipment and field application.

Typical use and users

Primary users are coal‑mine operators, mine safety and compliance officers, suppliers and producers of pulverized limestone (rock dust), mine contractors, and regulatory or inspection authorities. Typical uses include pre‑application quality testing of rock dust, supplier specifications, procurement standards for mine supplies, and safety/audit documentation demonstrating conformance with mine safety practices.

Related standards

Commonly referenced standards and regulations include relevant ASTM test methods and sampling practices for analysis of limestone and lime products (for example ASTM methods for chemical analysis, physical testing and sampling), and applicable mine safety regulations that set the required incombustible fraction for loose dust (for example U.S. Mine Safety and Health Administration requirements). Other ASTM documents on lime/limestone terminology and physical/chemical test methods are typically used alongside C737.

Keywords

limestone, rock dust, coal mine dusting, pulverized limestone, incombustible content, mine safety, moisture, combustible matter, silica, particle size, ASTM C737, C737-22

FAQ

Q: What is this standard?

A: ASTM C737-22 is a concise specification that defines the required physical and chemical properties of pulverized limestone intended for dusting coal mines to reduce coal‑dust explosion risk.

Q: What does it cover?

A: It covers particle‑size distribution, maximum moisture, limits on combustible matter and silica, and refers to appropriate sampling and test methods to verify those characteristics for limestone used as rock dust.

Q: Who typically uses it?

A: Mine operators, safety and compliance personnel, rock‑dust suppliers and manufacturers, laboratory analysts performing acceptance testing, and regulatory inspectors use the standard.

Q: Is it current or superseded?

A: The current designation is C737-22 (approved in 2022). Users should confirm they are using the latest ASTM edition and any applicable regulatory updates before relying on the specification for compliance.

Q: Is it part of a series?

A: It is part of ASTM’s collection of standards related to lime and limestone (committee C07) and is commonly used together with ASTM test methods and practices covering sampling, chemical analysis and physical testing of lime/limestone products.

Q: What are the key keywords?

A: Limestone, rock dust, coal mine dusting, incombustible content, particle size, moisture, silica, combustible matter, ASTM C737-22.