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GB/T 3810.2-2026Test methods of ceramic tiles - Part 2: Determination of dimensions and surface quality (English PDF)

陶瓷砖试验方法第2部分：尺寸和表面质量的检验

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

July 2, 2026

Implementation date

February 1, 2027

Scope

GB/T 3810.2-2026 is the English-translated version of 陶瓷砖试验方法第2部分：尺寸和表面质量的检验.

GB/T 3810.2-2026 — 2 Normative References 1 3 Terms and Definitions 1 4.1 Instruments 5 4.2 Sample 5 4.3 Step 5 4.4 Results Representation 5

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Document preview — GB/T 3810.2-2026

National Standard of the People's Republic of China

ICS: 91.100.25
Classification: Q 31
Replacing: GB/T 3810.2-2016

Issued by: State Administration for Market Regulation

Preface
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4.1 Instruments
4.2 Sample
4.3 Step
4.4 Results Representation
4.5 Test Report
5 Thickness measurement 6.
5.1 Instruments
5.2 Sample
5.3 Step
5.4 Results Representation
5.5 Test Report
6 Measurement of side straightness
6.1 Calculation
6.2 Instruments
6.3 Sample
6.4 Step
6.5 Test Report
7 Measurement of right angle 8.
7.1 Calculation
7.3 Sample
7.4 Step
7.5 Test Report
8 Measurement of flatness 9.
8.1 Instruments
8.2 Sample
8.3 Step
8.4 Results indicate
8.5 Test Report
9 Measurement of convex and concave surfaces 10.
10 Measurement of the difference in length of opposite sides and the difference in length of diagonals.
11 Surface quality
11.1 Surface defects and human effects
11.2 Instrument
11.3 Sample
11.4 Step
11.5 The result indicates
11.6 Test Report
Appendix A (Informative) Structure Numbering Comparison Table

1 Scope 1

2 Normative References 1

3 Terms and Definitions 1

4.1 Instruments 5

4.2 Sample 5

4.3 Step 5

4.4 Results Representation 5

4.5 Test Report 5

5.Thickness measurement 6.

5.1 Instruments 6

5.2 Sample 6

5.3 Step 6

5.4 Results Representation 6

5.5 Test Report 6

6 Measurement of side straightness

6.1 Calculation 6

6.2 Instruments 7

6.3 Sample 7

6.4 Step 7

6.5 Test Report 8

7.Measurement of right angle 8.

7.1 Calculation 8

7.3 Sample 8

7.4 Step 8

7.5 Test Report 9

8.Measurement of flatness 9.

8.1 Instruments 9

8.2 Sample 9

8.3 Step 9

8.4 Results indicate 9

8.5 Test Report 10

9.Measurement of convex and concave surfaces 10.

10.Measurement of the difference in length of opposite sides and the difference in length of diagonals.

11 Surface quality 10

11.1 Surface defects and human effects 10

11.2 Instrument 10

11.3 Sample 10

11.4 Step 11

11.5 The result indicates 11

11.6 Test Report 11

Appendix A (Informative) Structure Numbering Comparison Table 12

This document conforms to GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting is scheduled.

This document is Part 2 of GB/T 3810 "Test Methods for Ceramic Tiles". GB/T 3810 has already published the following parts.

--Part 1: Sampling and Acceptance Conditions;

--Part 2: Inspection of dimensions and surface quality;

--Part 3: Determination of water absorption, apparent porosity, apparent relative density and bulk density;

--Part 4: Determination of fracture modulus and breaking strength;

--Part 5: Determining the impact resistance of bricks using the coefficient of restitution;

--Part 6: Determination of the wear resistance depth of unglazed tiles;

--Part 7: Determination of the abrasion resistance of glazed tile surfaces;

--Part 8: Determination of linear thermal expansion;

--Part 9: Determination of thermal shock resistance;

--Part 10: Determination of Moisture Swelling;

--Part 11: Determination of the resistance of glazed tiles to glaze cracking;

--Part 12: Determination of freeze resistance;

--Part 13: Determination of chemical resistance;

--Part 14: Determination of stain resistance;

--Part 15: Determination of lead and cadmium leaching from ceramic tiles;

--Part 16: Determination of small color differences;

--Part 20: Determination of deflection in the calculation of the radius of curvature of ceramic tiles.

This document replaces GB/T 3810.2-2016 "Test Methods for Ceramic Tiles - Part 2: Inspection of Dimensions and Surface Quality", and is consistent with...

Compared to GB/T 3810.2-2016, apart from structural adjustments and editorial changes, the main technical changes are as follows.

a) The definitions of "pinholes", "orange glaze" and "polishing defects" have been changed (see 3.11, 3.12, 3.20, and 2.11, 2.12, 2.20 in the 2016 edition).

b) The requirements for "samples" have been changed (see 4.2, 5.2, 6.3, 7.3, 8.2, 11.3, and 3.2, 4.2, 5.2, 6.2, 7.2, 10.2 in the 2016 edition).

c) The requirement for "calculation" in the measurement of right angles has been changed (see 7.1, 2.2 of the 2016 edition).

d) The requirements for "surface quality" have been changed (see 11.1, 11.3, 11.4, and 10.2 and 10.3 in the 2016 edition).

This document is modified to adopt ISO 10545-2:2018 "Ceramic tiles - Part 2: Inspection of dimensions and surface quality".

Compared with ISO 10545-2:2018, this document has undergone many structural adjustments. A comparison of the structural numbering changes between the two documents is provided below.

See Appendix A for the table.

The technical differences between this document and ISO 10545-2:2018, and the reasons therefor, are as follows.

--The requirement for the number of measurements in "Result Representation" (see 4.4) has been changed to be consistent with the sampling quantity requirements in the standard for easier understanding;

--The test method for flatness of tiles with a size no larger than 40 mm × 40 mm is removed, and no distinction is made between tile sizes (see 8.1).

To adapt to the actual situation of my country's ceramic tile size market;

--Added "Measurement of convex and concave surfaces" (see Chapter 9) to adapt to the actual situation of large-format ceramic tiles (slabs) in my country;

--Added "Measurement of the difference in length between opposite sides and the difference in length between diagonals" (see Chapter 10) to accommodate large-format ceramic tiles (slabs) in my country.

The actual situation.

The following editorial changes have been made to this document.

--To harmonize with existing standards, the standard title has been changed to "Test Methods for Ceramic Tiles - Part 2: Inspection of Dimensions and Surface Quality";

--The illustration numbers have been rearranged in order.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Building Materials Federation.

This document is under the jurisdiction of the National Technical Committee on Standardization of Building and Sanitary Ceramics (SAC/TC 249).

Introduction

The dimensions and surface quality of ceramic tiles are important indicators for evaluating the quality of ceramic tile products and their decorative performance in installation. Standardization efforts in this area have attracted attention.

This has garnered widespread attention both domestically and internationally. In this regard, the ISO 10545 series of standards, developed by the International Organization for Standardization (ISO), outlines test methods for ceramic tiles.

Regarding standards, my country has already undertaken domestic adaptation work for this series of standards and established the corresponding GB/T 3810 "Test Methods for Ceramic Tiles".

National standards system.

This document is Part 2 of GB/T 3810 "Test Methods for Ceramic Tiles", which aims to determine the dimensions and surface quality of ceramic tiles.

GB/T 3810 "Test Methods for Ceramic Tiles" consists of 18 parts.

--Part 1: Sampling and Acceptance Conditions. The aim is to establish a sampling inspection system for ceramic tiles.

Product appearance quality.

--Part 3: Determination of water absorption, apparent porosity, apparent relative density, and bulk density. The aim is to establish indicators such as water absorption rate for ceramic tiles.

The standard testing method facilitates the classification of ceramic tiles.

--Part 4: Determination of modulus of rupture and breaking strength. The aim is to establish methods for testing the mechanical properties of ceramic tiles to evaluate their strength.

Mechanical properties of ceramic tiles.

--Part 5: Determining the Impact Resistance of Bricks Using the Coefficient of Restitution. The aim is to establish a method for testing the mechanical properties of ceramic tiles to evaluate...

The resistance of ceramic tiles to damage.

--Part 6: Determination of Abrasion Depth of Unglazed Tiles. The aim is to establish a method for testing the abrasion depth of unglazed tiles to evaluate their performance.

The ability to resist wear and tear.

--Part 7: Determination of Abrasion Resistance of Glazed Tile Surfaces. The aim is to establish a testing method for the abrasion resistance of glazed tile surfaces to evaluate their performance.

Glazed tiles' ability to resist wear.

--Part 8: Determination of Linear Thermal Expansion. The aim is to establish a method for testing the linear thermal expansion coefficient of ceramic tiles in order to evaluate ceramic tiles.

High-temperature stability of bricks.

--Part 9: Determination of Thermal Shock Resistance. The aim is to establish a testing method for the thermal shock resistance of ceramic tiles to evaluate their ability to withstand thermal shock.

Resistance to damage under rapid temperature changes.

--Part 10: Determination of Moisture Expansion. The aim is to establish a method for testing the moisture expansion of ceramic tiles to evaluate their resistance to deformation.

ability.

--Part 11: Determination of Glaze Cracking Resistance of Glazed Tiles. The aim is to establish a testing method for the glaze cracking resistance of ceramic tiles in order to evaluate the performance of ceramic tiles.

Durability.

Qualitative analysis.

--Part 13: Determination of Chemical Resistance. The aim is to establish a testing method for the chemical resistance of ceramic tiles in order to evaluate the performance of ceramic tiles.

The brick's resistance to chemical corrosion.

--Part 14: Determination of Stain Resistance. The aim is to establish a testing method for the stain resistance of ceramic tiles in order to evaluate their stain resistance.

Dyeing ability.

--Part 15: Determination of Lead and Cadmium Leaching from Ceramic Tiles. The aim is to establish a method for testing the lead and cadmium leaching levels in glazed tiles.

Assess the safety of ceramic tiles.

--Part 16: Determination of Small Color Differences. The aim is to establish a testing method for small color differences between monochrome ceramic tiles in order to evaluate the quality of ceramic tiles.

Appearance quality.

--Part 18: Determination of Light Reflectance Value (LRV). The aim is to establish a method for testing the light reflectance value of ceramic tiles to evaluate their properties.

The light reflectivity of bricks.

--Part 20: Determination of Deflection in the Calculation of the Radius of Curvature of Ceramic Tiles. The aim is to establish a method for testing and calculating the deflection of ceramic tiles.

The radius of curvature is determined to provide a basis for evaluating the flatness of ceramic tiles.

This revision of GB/T 3810.2 improves the requirements for sampling and testing methods in ceramic tile dimensional testing, ensuring the accuracy of test results.

Accuracy and scientific rigor.

Ceramic Tile Test Methods Part 2: Inspection of Dimensions and Surface Quality

1 Scope

This document describes the dimensions of ceramic tiles (length, width, thickness, edge straightness, right angle, flatness, convex and concave surfaces, and difference in length between opposite edges).

Note. If gaps, glaze bubbles, and other irregular edge defects are concealed within the mortar joints after tile installation, then the length, width, edge straightness, and right angles should be measured.

The time is negligible.

This document applies to the inspection of the dimensions and surface quality of ceramic tiles.

2 Normative references this document has no normative references.

3 Terms and Definitions the following terms and definitions apply to this document.

straightness of sides Within the plane of the brick, the deviation of the center of the edge from the straight line.

Note. See Figure 1.

Indexing symbol explanation.

C -- The deviation of the center of the measured side from the straight line, in millimeters (mm).

L -- The working dimension of the measuring side, in millimeters (mm).

Figure 1.Side straightness

deviation from rectangularity Place one corner of the brick against a right angle that has been corrected using a standard plate, and measure the deviation of that corner from the standard right angle.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 14 pages — is available in the English PDF.

Referenced standards

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