GB/T 3810.18-2025Test method of ceramic tiles - Part 18: Determination of light reflectance value (LRV) (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 20 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 abrasion 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 to glaze cracking in glazed tiles;

---Part 12: Determination of freeze resistance;

---Part 13: Determination of chemical resistance;

---Part 14: Determination of pollution resistance;

---Part 15: Determination of lead and cadmium leaching in glazed bricks;

---Part 16: Determination of Small Color Differences;

---Part 18: Measurement of Light Reflectance Value (LRV);

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

This document is equivalent to ISO 10545-18:2022 "Ceramic tiles - Part 18: Determination of light reflectance (LRV)".

The following minimal 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 18: Measurement of Light Reflectance (LRV)".

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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/TC249).

Introduction

The light reflectance value of ceramic tiles is an indicator of the material's ability to reflect light, and it is useful for light management in architectural design and interior decoration.

This is of great significance. The light reflectance value of ceramic tiles has become one of the important indicators for evaluating the performance of ceramic tiles, and its standardization has attracted attention both domestically and internationally.

This has garnered widespread attention. The ISO 10545 series of standards, developed by the International Organization for Standardization (ISO), are standards for test methods of ceramic tiles. my country has already addressed this issue.

Domestic adaptation of these standards has been carried out, and a corresponding national standard system has been established.

This document is Part 18 of GB/T 3810 "Test Methods for Ceramic Tiles", and aims to determine the light reflectance value of ceramic tiles. GB/T 3810 the 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.

---Part 2: Inspection of Dimensions and Surface Quality. The aim is to establish methods for inspecting the dimensions and surface quality of ceramic tiles to evaluate product quality.

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 Fracture and Breaking Strength. The aim is to establish methods for testing the mechanical properties of ceramic tiles to evaluate their performance.

Mechanical properties of bricks.

---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 bricks to evaluate their impact resistance.

The resistance of ceramic tiles to damage.

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

Ability to resist wear.

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

The ability of bricks 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 to evaluate their performance.

High temperature stability.

---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 rapid thermal shock.

Resistance to damage under extreme 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.

---Part 12: Determination of frost resistance. The aim is to establish a method for testing the frost resistance of ceramic tiles to evaluate their low-temperature stability.

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 to evaluate their resistance to staining.

staining ability.

---Part 15: Determination of Lead and Cadmium Leaching from Glazed Bricks. The aim is to establish a method for testing the lead and cadmium leaching levels in glazed bricks, in order to evaluate...

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 performance.

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.

Ceramic Tile Test Methods Part 18: Measurement of Light Reflectance (LRV)

1 Scope

This document specifies the test method for the light reflectance value (LRV) of ceramic tiles, including mosaic tiles.

This document applies to monochrome, multi-color, and unevenly tinted tile surfaces, including different types with firing effects, spots, or textures.

Type of finish.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

andtestmethods)

Note. GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories (ISO 3696:1987, MOD)

3 Terms and Definitions

The following terms and definitions apply to this document.

solid colored surface A surface with uniform color and the same chromaticity value.

multi-colored surface when observed at a distance of 3m, different areas of the surface exhibit distinctly different colors or surfaces composed of small color spots; at a distance of 1m...

When observed, the surface appears to be one color.

non-uniform shade surface A surface with a certain degree of color variation.

Speckled surface

Surfaces with small marks, spots, or wobbles.

textured surface

This results in surface textures with extreme angle dependence of reflected light and a maximum peak-to-valley distance of less than 2 mm.

The CIE tristimulus value Y is also known as the luminance factor.