GB/T 46022-2025 English PDF
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GB/T 46022-2025: Cover glass for vehicle displays
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT46022-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040.60 CCS T 26 Cover Glass for Vehicle Displays Issued on: AUGUST 1, 2025 Implemented on: FEBRUARY 1, 2026 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 6 4 Classification... 7 5 Technical Requirements... 7 5.1 Appearance Quality... 7 5.2 Dimensional Deviations... 7 5.3 Warpage... 8 5.4 Visible Light Transmittance... 8 5.5 Gloss... 8 5.6 Water Contact Angle... 8 5.7 Roughness... 8 5.8 Micro-waviness... 8 5.9 Anti-staining Properties... 8 5.10 Abrasion Resistance... 8 5.11 Surface Stress (CS)... 9 5.12 Depth of Layer (DOL)... 9 5.13 Scratch Resistance... 9 5.14 Vickers Hardness... 9 5.15 Impact Resistance... 9 5.16 Corrosion Resistance... 9 5.17 High Temperature and Humidity Resistance... 9 6 Test Methods... 9 6.1 Test Conditions... 9 6.3 Dimensional Deviations... 10 6.4 Warpage... 10 6.5 Visible Light Transmittance... 10 6.6 Gloss... 10 6.7 Water Contact Angle... 11 6.8 Roughness... 12 6.9 Micro-waviness... 12 6.10 Anti-staining Properties... 12 Cover Glass for Vehicle Displays1 Scope
This document specifies the classification, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of cover glass for vehicle displays (hereinafter referred to as the “cover glass”). This document applies to transparent glass materials with touch control function and protective effect within the cabin of motor vehicles; the cover glass for other displays may take this document as a reference.2 Normative References
The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 2680 Glass in Building - Determination of Light Transmittance, Solar Direct Transmittance, Total Solar Energy Transmittance, Ultraviolet Transmittance and Related Glazing Factors GB/T 2828.1-2012 Sampling Procedures for Inspection by Attributes - Part 1.Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection GB/T 3922-2013 Textiles - Tests for Color Fastness - Color Fastness to Perspiration GB/T 13891 Test Methods of Specular Gloss for Decorative Building Materials GB/T 20314-2017 Thin Float Glass for Liquid Crystal Display (LCD) Applications GB/T 30447-2013 Measurement Method for Contact Angle of Nano-film Surface GB/T 32642 Flat Panel Displays Glass Substrate Surface Roughness Measurement Method GB/T 32643 Flat Panel Displays Glass Substrates Surface Waviness Measurement Method GB/T 37900-2019 Test Method of Hardness and Fracture Toughness for Ultra-thin Glass - Low- load Vickers Hardness Indentation Method GB/T 39815-2021 Test Method for Scratch Resistance of Ultrathin Glass JC/T 2462-2018 Anti-glare Glass QB/T 2777 Marking Pens QC/T 1171-2022 Automotive Paint Protection Film3 Terms and Definitions
The terms and definitions defined in GB/T 39815-2021, GB/T 30447-2013, GB/T 20314-2017 and JC/T 2462-2018, and the following are applicable to this document. 3.1 cover glass for vehicle displays Transparent glass material that is used inside motor vehicles for the surface of displays to protect the display components. 3.2 scratch resistance The ability of a specimen surface to resist scratching by a hard object. NOTE. it is expressed as a critical load value. [source. GB/T 39815-2021, 3.3, modified] 3.3 gloss Under specified light source and receiving angle conditions, the ratio of the luminous flux reflected in the specular direction of an object to the luminous flux reflected in the specular direction of glass with a refractive index of 1.567. 3.4 contact angle The angle between the tangents of the gas-liquid interface and the solid-liquid interface at the gas-liquid-solid three-phase junction point. NOTE. the symbol θ, and the unit is degrees (°). [source. GB/T 30447-2013, 3.1, modified] 3.5 depth of layer “DOL” When light enters chemically tempered glass at a certain angle, and the refractive index difference along the glass thickness direction from the surface layer to the interior just reaches its maximum value, the depth, at which, retro-refraction is generated. NOTE. the DOL value is less than the ion exchange layer depth but greater than the compressive stress layer depth. 3.6 micro-waviness The degree of minor fluctuations and unevenness on the glass surface. [source. GB/T 20314-2017, 3.4] 3.7 Roughness The unevenness of the glass surface formed during acid etching, characterized by small spacing and minor peaks and valleys. [source. JC/T 2462-2018, 3.4]4 Classification
Based on whether a coating treatment is performed, it is divided into ordinary cover glass and coated cover glass for vehicle displays.5 Technical Requirements
5.1 Appearance Quality The appearance quality shall comply with the provisions of Table 1. 5.2 Dimensional Deviations The thickness, length and width deviations of the cover glass shall conform to the provisions of Table 2.For irregularly shaped cover glass, the dimensional deviations shall be agreed upon by test, the absolute value of the difference in water contact angle shall not exceed 10°. 5.11 Surface Stress (CS) The surface stress (CS) shall not be less than 550 MPa. 5.12 Depth of Layer (DOL) The depth of layer (DOL) shall not be less than 10 m. 5.13 Scratch Resistance After the test, no scratches longer than 3 mm shall appear. 5.14 Vickers Hardness The Vickers hardness shall not be less than 5.80 GPa (591.426 kgf/mm²). NOTE. 1 GPa = 101.97 kgf/mm². 5.15 Impact Resistance After the test, the number of specimens damaged shall not exceed one. 5.16 Corrosion Resistance Coated cover glass with anti-fingerprint function shall undergo this test. Before and after the test, the absolute value of the difference in the water contact angle shall not exceed 5°. 5.17 High Temperature and Humidity Resistance Coated cover glass with anti-fingerprint function shall undergo this test. Before and after the test, the absolute value of the difference in the water contact angle shall not exceed 5°.6 Test Methods
6.1 Test Conditions Unless otherwise specified, the test shall be conducted under the following environmental conditions. a) Ambient temperature. 20 C 5 C; b) Relative humidity. 40% ~ 80%. 6.2 Appearance Quality Use the product as a specimen, place the specimen in a dark chamber in front of a fluorescent lamp with an illuminance of not less than 1,000 lx, and at a distance of 300 mm from the specimen, visually inspect it at eye level or by rotating it upside down, and record the results. Use a reading microscope with a division value of 0.01 mm and a steel ruler with a division value of 1 mm to measure the dimensions of point-like defects and scratches, and the distance between any two defects. 6.3 Dimensional Deviations Use the product as a specimen, place the specimen on a measuring platform, and use a vernier caliper or other measuring instrument with an accuracy of not less than 0.02 mm to respectively measure the distance between the two parallel sides in the middle of the long and wide sides. Use a micrometer with an accuracy of not less than 0.001 mm to measure the thickness at the midpoint of the four sides of the specimen, and it is necessary to avoid the printing area. The thickness value is expressed as the average value of the four points and retained to three decimal places. The difference between the measurement value and the nominal value is the dimensional deviation. 6.4 Warpage Use the product as a specimen, place the specimen with its outer surface facing upwards on a measuring platform (00-grade flatness marble). Use a feeler gauge to measure the maximum distance between the lower surface of the specimen and the platform surface. Flip the specimen, so that its outer surface faces downwards and measure the maximum distance between the lower surface of the specimen and the platform surface again. Take the maximum value of the measurement result. 6.5 Visible Light Transmittance 6.5.1 Specimen Use the product as specimens or cut specimens from the product. Alternatively, use 100 mm 100 mm test pieces prepared with the same material and process as the product. The number of specimens is 3. 6.5.2 Test procedures In accordance with the method specified in GB/T 2680, measure the visible light transmittance of the viewing area of the specimen. The result is expressed as the arithmetic mean of the 3 specimens and rounded to 0.1%. 6.6 Gloss 6.6.1 Specimen Use the product as specimens or cut specimens from the product. Alternatively, use 100 mm 100 mm test pieces prepared with the same material and process as the product. The number of specimens is 3. 6.6.2 Test procedures ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
