ASTM C652-19a

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of the standard as published by ASTM is to be considered the official document.
Designation: C652 − 19 C652 − 19a
Standard Specification for
Hollow Brick (Hollow Masonry Units Made From Clay or
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Shale)
This standard is issued under the fixed designation C652; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers hollow building brick and hollow facing brick made from clay, shale, fire clay, or mixtures thereof,
and fired to incipient fusion. Four types of hollow brick in each of two grades and two classes are covered. In this specification,
the term hollow brick shall be understood to mean hollow clay masonry units whose net cross-sectional area (solid area) in any
plane parallel to the surface, containing the cores, cells, or deep frogs, is less than 75 % of its gross cross-sectional area measured
in the same plane (see 4.3). This specification does not cover brick intended for use as paving brick (see Specification C902).
1.2 The property requirements of this specification apply at the time of purchase. The use of results from testing of brick
extracted from masonry structures for determining conformance or nonconformance to the property requirements (Section 67) of
this standard is beyond the scope of this specification.
1.3 Brick covered by this specification are ceramic products manufactured primarily from clay, shale, or similar naturally
occurring substances and subjected to a heat treatment at elevated temperatures (firing). The heat treatment shall develop sufficient
fired bond between the particulate constituents to provide the strength and durability requirements of this specification. Additives
or recycled materials are permitted to be included at the option of the manufacturer. (See “firing” and “firing bond” in Terminology
C1232.)
1.3.1 This specification and its individual requirements shall not be used to qualify or corroborate the performance of a masonry
unit made from other materials, or made with other forming methods, or other means of binding the materials.
1.4 Hollow brick differ from unglazed structural clay tile (Specifications C34 and C212) and solid brick (Specifications C62 and
C216). Hollow brick require greater shell and web thicknesses and higher minimum compressive strength than structural clay tile,
but permit greater void area and lesser distance from exposed edge to core hole than solid brick. Therefore, environmental and
structural performance may be different in elements constructed of hollow brick from those constructed of structural clay tile or
solid brick.
1.5 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the specification.
1.6 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.7 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
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2.1 ASTM Standards:
C34 Specification for Structural Clay Loadbearing Wall Tile
C62 Specification for Building Brick (Solid Masonry Units Made From Clay or Shale)
C67C67/C67M Test Methods for Sampling and Testing Brick and Structural Clay Tile
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This specification is under the jurisdiction of ASTM Committee C15 on Manufactured Masonry Units and is the direct responsibility of Subcommittee C15.02 onon Brick
and Structural Clay Tile.
Current edition approved April 15, 2019Aug. 1, 2019. Published May 2019August 2019. Originally approved in 1970. Last previous edition approved in 20172019 as
C652 – 17a.C652 – 19. DOI: 10.1520/C0652-19.10.1520/C0652-19A.
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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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at t
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