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IS 13630:2006 Part 4 is the Indian Standard (BIS) for ceramic tiles - classification, sampling and methods of test - part 4: determination of flexural strength. This standard (Part 4) details the method for determining the flexural strength, also known as the Modulus of Rupture (MOR), of ceramic tiles. It specifies the three-point bending test apparatus, procedure for testing, and the formula used to calculate the strength from the breaking load.
Specifies the method for determining the flexural strength (breaking strength) of ceramic tiles.
ISO 13006:2018International Organization for Standardization (ISO), International
HighCurrent
Ceramic tiles — Definitions, classification, characteristics and marking
Annex C 'Sampling and basis for acceptance' is technically equivalent to the scope of IS 13630 (Part 1).
EN 14411:2016European Committee for Standardization (CEN), Europe
HighCurrent
Ceramic tiles - Definitions, classification, characteristics, assessment and verification of constancy of performance and marking
Based on a previous version of ISO 13006, it contains a technically similar annex for sampling and acceptance.
AS ISO 13006:2020Standards Australia, Australia
HighCurrent
Ceramic tiles - Definitions, classification, characteristics and marking
Direct adoption of ISO 13006, therefore its sampling annex is a direct equivalent.
ANSI A137.1-2023American National Standards Institute / Tile Council of North America (TCNA), USA
MediumCurrent
American National Standard Specifications for Ceramic Tile
Includes sections on sample selection and inspection but follows a different structure and criteria set by the TCNA.
Key Differences
≠IS 13630 (Part 1) is a standalone, normative standard dedicated solely to sampling and acceptance. In contrast, the equivalent procedures in ISO 13006 are contained within an informative annex (Annex C).
≠The Indian standard explicitly states the Acceptable Quality Levels (AQL) of 1.0% for dimensional/surface quality and 2.5% for visual defects, referencing IS 2500 (Part 1) as its statistical basis. ISO 13006 provides the acceptance/rejection numbers directly in a table without explicitly stating the AQL values.
≠As a national standard, compliance with IS 13630 is often mandatory for government projects and for products carrying the national ISI certification mark in India. ISO 13006 is a voluntary international standard, primarily used as a reference for international trade and national standard development.
Key Similarities
≈The core sampling plan, including the relationship between lot size, sample size, and acceptance/rejection numbers, is virtually identical between IS 13630 (Part 1) and ISO 13006 (Annex C).
≈Both standards categorize tile characteristics for sampling purposes into two distinct groups: 'dimensional and surface quality requirements' and 'visual characteristics', applying different acceptance criteria to each.
≈The fundamental principle of lot acceptance is the same: a sample is drawn, nonconforming units are counted, and the lot is accepted or rejected based on pre-defined acceptance (Ac) and rejection (Re) numbers.
≈The definition and concept of a 'lot' (a quantity of tiles of the same type, size, and shade, manufactured under uniform conditions) are functionally equivalent in both standards.
Parameter Comparison
Parameter
IS Value
International
Source
Sample Size for Lot of 5,000 tiles
200 (for lot size 3201-10000)
200 (for lot size 3201-10000)
ISO 13006:2018
Acceptance Number (Ac) for Visual Defects (Sample of 200)
10
10
ISO 13006:2018
Rejection Number (Re) for Visual Defects (Sample of 200)
11
11
ISO 13006:2018
Acceptance Number (Ac) for Dimensional/Surface Quality (Sample of 200)
5
5
ISO 13006:2018
Rejection Number (Re) for Dimensional/Surface Quality (Sample of 200)
6
6
ISO 13006:2018
Stated AQL for Visual Defects
2.5 percent
Not explicitly stated; acceptance numbers are provided directly.
ISO 13006:2018
Stated AQL for Dimensional Requirements
1.0 percent
Not explicitly stated; acceptance numbers are provided directly.
ISO 13006:2018
Statistical Basis Reference
IS 2500 (Part 1)
Implicitly based on ISO 2859-1, but not explicitly referenced.
ISO 13006:2018
⚠ Verify details from original standards before use
Key Values4
Quick Reference Values
Diameter of supporting and loading rods10 mm or 20 mm depending on tile size
Rate of application of load1.0 ± 0.2 N/mm²·s
Minimum number of test specimens10
Span between supporting rods (L) for tiles >= 100mmLength of tile (l) minus 40 mm
Key Formulas
σ = (3 * F * L) / (2 * b * h²) — Formula for Flexural Strength (Modulus of Rupture)
Tables & Referenced Sections
Key Tables
No tables data
Key Clauses
Clause 4 - Principle
Clause 5 - Apparatus
Clause 7 - Procedure
Clause 8 - Expression of Results
Frequently Asked Questions4
What property does this test measure?+
It measures the flexural strength (or Modulus of Rupture - MOR), which is the material's ability to resist bending forces before it breaks.
What is the test principle?+
A three-point loading method, where a tile is placed on two parallel supporting rods and a force is applied centrally on the top surface by a third rod until it fractures (Clause 4).
How is the final strength value calculated?+
Using the formula σ = (3FL) / (2bh²), where F is the breaking load, L is the span, b is the width, and h is the thickness of the tile (Clause 8).
Where can I find the required minimum strength for a specific tile?+
This standard only provides the test method. The required MOR values for different types of tiles are specified in IS 13630 (Part 1).