ASTM C1405-23 PDF

Overview

ASTM C1405-23 is the internationally recognized standard specification for glazed brick (single fired, brick units) used in masonry construction. Developed by ASTM, this specification prescribes the requirements for bricks with a ceramic glaze finish that is fused to the body during the same firing process as the brick unit itself. The standard addresses the use of glazed brick for both structural and facing applications and ensures consistent durability, strength, and physical properties necessary for performance in a wide variety of building projects.

This standard does not cover double-fired glazed bricks, which are produced with a separate, typically lower-temperature decorative glaze firing process. Single-fired glazed bricks specified in ASTM C1405-23 are prismatic units manufactured from clay, shale, or similar naturally occurring materials and are made available in a variety of sizes, colors, textures, and shapes to meet architectural and structural needs.

Key Topics

• Classification: Glazed brick units are categorized into two grades (Grade S - standard, and Grade SS - select sized), two types (Type I - single-faced, Type II - double-faced), two classes (Class Exterior for high resistance to freeze-thaw damage, Class Interior for limited resistance), and three divisions based on the presence and configuration of voids (Solid, H40V, H60V).
• Physical Requirements: The standard includes criteria for compressive strength, durability, water absorption, and freeze-thaw resistance, ensuring optimal performance under various environmental conditions.
• Appearance and Finish: Requirements ensure bricks are free from defects, with uniform, high-quality glazing available in custom colors and textures. Glazed surfaces must be free of chips, crazing, blisters, and significant imperfections when viewed under specified conditions.
• Testing and Compliance: Methods and referenced ASTM standards are provided for sampling, testing, compressive strength, water absorption, efflorescence, flame spread, smoke density, and scratch resistance. Properties are verified at the point of purchase.
• Dimensional Tolerances: Detailed permissible variations on brick dimensions and warpage are specified by grade, supporting consistency in installation and finished appearance.
• Special Properties: Glazed brick must demonstrate specific qualities such as imperviousness, resistance to fading, crazing, and scratching, and be rated “non-combustible” with low smoke and flame spread indices.

Applications

ASTM C1405-23 glazed brick is widely used in:

• Architectural facing: Offering a durable, low-maintenance, and aesthetically versatile surface for exterior and interior walls in commercial, public, and residential buildings.
• Structural masonry: Providing strength and resilience suitable for load-bearing and non-load-bearing wall systems.
• Exterior wall systems: Utilized in cavity wall, veneer, and drainage wall designs; effective where resistance to weather and specific visual effects are required.
• Moisture-resistant construction: The impervious glazed finish is ideal for environments with high humidity or exposure to water, such as pools, restrooms, and gymnasiums.
• Custom design needs: The availability of various colors, textures, and shapes supports creative architectural detailing and historic restoration.

Related Standards

• ASTM C67/C67M: Methods for sampling and testing brick and structural clay tile, referenced for several physical property evaluations.
• ASTM C1088: Specification for thin veneer brick made from clay or shale, applicable when thin units are specified.
• ASTM C1895: Test method for scratch hardness, important for assessing glazed surface durability.
• ASTM E84: Surface burning characteristics of building materials, critical for fire safety evaluation.
• ASTM E2105: Techniques for thermogravimetric analysis (TGA) of building materials.
• NFPA 255 and UL 723: Standards for evaluating flammability and smoke production of building materials.

Practical Value

By adhering to ASTM C1405-23, architects, engineers, builders, and manufacturers can ensure that glazed brick units meet stringent requirements for performance, longevity, and appearance in masonry construction. This supports high-quality installations, reduces maintenance, enhances safety by specifying non-combustible materials, and offers design flexibility for both traditional and modern buildings. Consistent compliance with this standard helps streamline specifications, procurement, and inspection processes for both national and international building projects.