ASTM C67/C67M-25 PDF

Full title and description

ASTM C67/C67M-25 — Standard Test Methods for Sampling and Testing Brick and Structural Clay Tile. This standard specifies procedures for sampling, specimen preparation, and laboratory and field test methods to evaluate physical and mechanical properties of full-size brick, tiles, and solid masonry units used in construction and manufacturing quality control.

Abstract

These test methods cover procedures for the sampling and testing of brick and structural clay tile. Tests include modulus of rupture (flexure), compressive strength, absorption, saturation coefficient, freezing-and-thawing resistance, efflorescence, initial rate of absorption (suction), and measurements of weight, size, warpage, length change, breaking load and void area. Additional procedures pertinent to ceramic glazes (imperviousness, chemical resistance, opacity, and autoclaved crazing) are also included where applicable.

General information

• Status: Active.
• Publication date: August 1, 2025 (designation C67/C67M-25).
• Publisher: ASTM International.
• ICS / categories: 81.080 (Refractories / ceramic products).
• Edition / version: C67/C67M-25 (C0067_C0067M-25).
• Number of pages: 20 pages.

Scope

The standard provides standardized laboratory and field methods for sampling and testing full-size brick and structural clay tile to determine properties important for material specification, acceptance, and performance assessment. It applies to a wide range of units (though some procedures may not be relevant for every unit type) and includes precision and bias statements and an appendix addressing safety precautions for autoclave equipment used in certain glaze tests.

Key topics and requirements

• Sampling procedures and selection of representative units from production lots.
• Specimen preparation requirements and conditioning prior to testing.
• Modulus of rupture (flexure) and compressive strength test methods.
• Water absorption, saturation coefficient, and initial rate of absorption (suction) tests.
• Freeze–thaw resistance / durability testing and efflorescence assessment.
• Measurements of weight per unit area, dimensional tolerances (size, out-of-square), warpage, and length change.
• Determination of void area in cored or frogged units, shell/web thickness, and breaking load.
• Optional glaze tests: imperviousness, chemical resistance, opacity, and autoclaved crazing.
• Statements on precision, bias, and laboratory evaluation (see Practice C1093 referenced in the standard).

Typical use and users

Used by materials and testing laboratories, brick and tile manufacturers, quality assurance/quality control personnel, architects, engineers, specifiers, construction contractors, and code officials to verify conformance to product specifications, investigate failures, and support product development or acceptance testing.

Related standards

The standard notes laboratory evaluation guidance (Practice C1093) and is commonly used alongside other ASTM masonry and ceramic standards for specific product types and applications (for example, standards governing facing brick, masonry units, and glaze tests). Users typically consult the C67 series along with applicable product specifications and regional building codes when developing test programs.

Keywords

brick, structural clay tile, sampling, modulus of rupture, compressive strength, absorption, saturation coefficient, freeze–thaw, efflorescence, initial rate of absorption, size, warpage, void area, imperviousness, chemical resistance, opacity, autoclaved crazing, precision and bias.

FAQ

Q: What is this standard?

A: ASTM C67/C67M-25 is a collection of test methods for sampling and testing full-size brick and structural clay tile to determine mechanical and physical properties used for specification and quality control.

Q: What does it cover?

A: It covers sampling, specimen preparation, and tests such as flexure (modulus of rupture), compressive strength, absorption and suction, freeze–thaw, efflorescence, dimensional measurements (size, warpage, out-of-square), void area determinations, breaking load, and several glaze-related tests.

Q: Who typically uses it?

A: Test laboratories, manufacturers, QA/QC teams, architects, engineers, specifiers, and code authorities for product acceptance, quality control, investigation, and research.

Q: Is it current or superseded?

A: Current — the active designation is C67/C67M-25 (published in 2025). Users should always confirm the active designation before use.

Q: Is it part of a series?

A: Yes — C67/C67M is maintained as a continuing series with prior and intermediate editions (C67-xx, C67/C67M-21, -23, etc.); the standard is maintained by ASTM Committee C15 (Subcommittee C15.02).

Q: What are the key keywords?

A: Brick, structural clay tile, sampling, compressive strength, modulus of rupture, absorption, freeze–thaw, efflorescence, dimensional measurement, void area, imperviousness.