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IS 4860:1991 is the Indian Standard (BIS) for facing bricks - specification. This standard specifies the dimensions, physical requirements, and quality parameters for burnt clay facing bricks intended for use in exposed masonry without plaster.
Specifies requirements for burnt clay facing bricks used for aesthetic purposes in masonry construction.
! Facing bricks must be entirely free from cracks, flaws, and nodules of free lime to maintain the aesthetic and structural integrity of the facade.
! It is highly recommended to construct a sample reference panel before bulk execution to ensure uniform color and texture.
! Strictly monitor the efflorescence test results; any rating above 'Slight' can lead to severe aesthetic degradation (white staining) of exposed brickwork.
Standard Specification for Facing Brick (Solid Masonry Units Made from Clay or Shale)
Directly specifies requirements for clay or shale bricks intended for use in exposed masonry.
BS EN 771-1:2011+A1:2015BSI / CEN, UK / Europe
HighCurrent
Specification for masonry units - Part 1: Clay masonry units
Harmonized European standard covering all clay masonry units, including those for facing applications.
AS/NZS 4455.1:2008Standards Australia / Standards New Zealand
MediumCurrent
Masonry units and segmental pavers and flags - Part 1: Masonry units
Covers both clay and concrete masonry units, with sections applicable to facing bricks.
Key Differences
≠IS 4860 uses two classes (Class I, Class II) based on visual appearance, while ASTM C216 uses Types (FBX, FBS, FBA) for appearance and Grades (SW, MW) for durability against weathering.
≠The minimum average compressive strength in IS 4860 (7 N/mm²) is significantly lower than the minimums specified in ASTM C216 for its primary grades (e.g., Grade SW: ~20.7 N/mm²).
≠IS 4860 specifies a 24-hour cold water immersion test for water absorption, whereas ASTM C216 uses a 5-hour boiling test, which is a more aggressive method and yields different results.
≠The approach to classification in BS EN 771-1 is performance-based, where manufacturers declare values and categories (e.g., for strength, tolerance), contrasting with the prescriptive fixed limits in IS 4860.
Key Similarities
≈All standards aim to control the quality of burnt clay bricks intended for visually exposed applications (facing work).
≈They all evaluate a core set of physical properties: compressive strength, water absorption, and dimensional stability.
≈Provisions for limiting efflorescence are a key component in all compared standards, as it directly affects the aesthetic quality of facing masonry.
≈All standards include requirements for visual inspection, controlling for defects like cracks, chips, and excessive warpage that would be unacceptable in a finished wall.