Standard No.:	GB/T 15763.2-2025
English Name:	Safety glazing materials in building - Part 2: Tempered glass
Chinese Name:	建筑用安全玻璃 第2部分：钢化玻璃
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR, SAC
Issued on:	2025-10-31
Implemented on:	2026-8-1
Status:	to be valid
Superseding:	GB 15763.2-2005 Safety glazing materials in building?Part 2:Tempered glass
Target Language:	English
File Format:	PDF
Word Count:	20500 words
Translation Price(USD):	615.0
Delivery:	via email in 1 business day

ICS 81.040.20 CCS Q 33 National Standard of the People’s Republic of China GB/T 15763.2-2025 Replaces GB/T 15763.2-2005 Safety glazing materials in building - Part 2: Tempered glass 建筑用安全玻璃 第2部分:钢化玻璃 (English translation) Issue date: 2025-10-31 Implementation date: 2026-08-01 Issued by the State Administration for Market Regulation of the People's Republic of China the Standardization Administration of the People's Republic of China Safety glazing materials in building - Part 2: Tempered glass 1 Scope This document specifies the classification, requirements, inspection rules, packaging, transportation and storage, and describes the test methods of tempered glass used in building. This document applies to the design, production and delivery of tempered glass used in building after heat treatment process. For tempered glass used outside buildings (such as industrial equipment, furniture and household appliances, etc.), if there is no corresponding product standard, this document shall be used for reference according to the product characteristics. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 6091 Knife straight edge GB 11614 Flat glass GB/T 18144 Test method for measurement of stress in glass GB/T 20428 Granite surface plates JC/T 2451 Borosilicate flat glass 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 tempered glass; toughened glass glass that, through heat treatment process, forms a compressive stress layer on its surface, significantly enhancing its mechanical strength and thermal shock resistance, and presents a special fragmentation pattern upon breakage Note: During actual engineering applications, tempered glass may experience non-impact breakage or explosion due to some special reasons. The causes and corresponding measures that can be taken are detailed in Annex A. 3.2 iridescence; strain pattern optical interference pattern characterized by variations in color or brightness across different areas of the glass panel surface can be seen within a certain angle range when tempered glass is observed under polarized light Note: iridescence is an inherent characteristic of tempered glass. For its causes, see Annex B. 3.3 crack cracking defect on the glass panel surface or cross-section 3.4 corner fault corner breakage of glass 3.5 mottling visible spot-like defects that form on the glass surface during the tempering process, causing light scattering 3.6 cloudiness; white mark white strip or strip-shaped dense fog scratches that form on the surface during tempering process 4 Classification Tempered glass is classified by shape into flat tempered glass and curved tempered glass. 5 Requirements 5.1 Dimension and deviation 5.1.1 Deviation for the edge length of rectangular flat tempered glass shall comply with Table 1. Table 1 Deviation for edge length of rectangular flat tempered glass and straight edge length of curved tempered glass Dimensions in millimetres Nominal thickness (t) Edge length or straight edge length (L) L≤1000 10006000 2≤t≤3 ±1 ±2 To be determined by the supplier and the purchaser through negotiation 319 ±3 To be determined by the supplier and the purchaser through negotiation 5.1.2 The deviation for the diagonal difference of rectangular flat tempered glass shall comply with Table 2. Table 2 Tolerance for the diagonal difference of rectangular flat tempered glass Dimensions in millimetres Nominal thickness (t) Edge length (L) L≤2000 20004000 2≤t≤12 ≤2 ≤3 To be determined by the supplier and the purchaser through negotiation 1219 To be determined by the supplier and the purchaser through negotiation 5.1.3 The deviation for the straight edge length of curved tempered glass shall comply with Table 1. The deviation for curvature and arc length shall comply with Table 3. Table 3 Deviation for curvature and arc length of curved tempered glass Dimensions in millimetres Item Nominal thickness (t) t<10 t ≥ 10 Tolerance for curvature ≤2/3t ≤1/2t Tolerance for arc length per meter ±2 ±3 5.1.4 For tempered glass using soda-lime-silica flat glass as the base material, the thickness deviation shall comply with Table 4. While for tempered glass using borosilicate flat glass as the base material, the thickness tolerances shall comply with JC/T 2451. For tempered glass using other types of glass as the base material, the thickness tolerances shall meet the relevant requirements of the base glass or be subject to agreement between the supplier and the buyer. Table 4 Thickness deviation for tempered glass using soda-lime-silica flat glass as the base material Dimensions in millimetres Nominal thickness (t) Tolerance 2≤t<3 ±0.10 3≤t<5 ±0.15 5≤t<8 ±0.20 8≤t≤12 ±0.30 1219 ±1.00 5.1.5 The dimensional deviation for tempered glass of other shapes shall be subject to agreement between the supplier and the buyer. 5.2 Edge processing The shape and quality of edge processing methods shall be agreed upon by the supplier and the buyer based on the product's application field and intended use. Note: The edge processing methods for tempered glass include chamfering, edge polishing, rough grinding, fine grinding, and polishing, see Annex C. 5.3 Circular hole 5.3.1 Hole edge Hole edge should be chamfered. For tempered glass with a thickness of not less than 4 mm, the chamfer width of the hole edges should not be less than 1 mm. For tempered glass with a thickness of less than 4 mm, the edge processing method of the hole edges shall be agreed upon by the supplier and the buyer. 5.3.2 Aperture The deviation of aperture shall comply with Table 5. Table 5 Deviation of aperture Dimensions in millimetres Nominal thickness (t) Nominal aperture (D) Tolerance 2≤t<4 2≤D<10 ±0.8 10≤D≤50 ±1.0 50100 To be determined by the supplier and the purchaser through negotiation t≥4 4≤D≤50 ±1.0 50100 To be determined by the supplier and the purchaser through negotiation 5.3.3 Location of hole 5.3.3.1 For tempered glass with a thickness of less than 4 mm, the distance (a) from a hole to the glass edge shall not be less than twice the nominal thickness (t) of the glass. For tempered glass with a thickness of less than 4 mm, the distance (a) from a hole to the glass edge should not be less than 8 mm, as shown in Figure 1. Key 1 - tempered glass; a - distance (a) from a hole to the glass edge. Figure 1 Schematic diagram for the distance from the edge of the hole to the edge of the glass 5.3.3.2 The distance b between the edges of two holes shall not be less than 2 times the nominal thickness (t) of the glass, as shown in Figure 2. Key 1 - tempered glass; b - distance between the edges of two holes Figure 2 Schematic diagram for distance between edges of two holes 5.3.3.3 The distance (c) between the edge of the hole and the vertex of the glass shall not be less than 6 times the nominal thickness, (t), of the glass. As shown in Figure 3. If (c) is less than 35 mm, the center of the hole shall not lie on the bisector of the corner. The specific position shall be agreed upon by the supplier and the buyer. For tempered glass with arc corners, the intersection point of extension lines on both sides is the vertex. Key 1 - Non-drilling area for tempered glass; 2 - Drilling area for tempered glass; c - Distance between the edge of the hole and the corner of the glass Figure 3 Schematic diagram for the distance between the edge of the hole and the corner of the glass 5.3.3.4 For the method of expressing the position of the circle center position of the hole, see Figure 4. Establish a coordinate system as shown in Figure 4, and use the position coordinates (x, y) of the circle center to express the position of the circle center. The tolerance for the position (x, y) of the circle center of the hole is the same as that of the edge length. a) Example 1 for the method of expressing the position of the circle center position of the hole b) Example 2 for the method of expressing the position of the circle center position of the hole c) Example 3 for the method of expressing the position of the circle center position of the hole d) Example 4 for the method of expressing the position of the circle center position of the hole Key 1 - tempered glass. Figure 4 Schematic diagram for the method of expressing the position of the circle center position of the hole

Contents Foreword III Introduction V 1 Scope 2 Normative references 3 Terms and definitions 4 Classification 5 Requirements 6 Test methods 7 Inspection rules 8 Packaging, transportation and storage Annex A (Informative) Fracture or breakage of tempered glass under non-impact conditions Annex B (Informative) Iridescence of tempered glass Annex C (Informative) Methods for processing edges of tempered glass Annex D (Informative) Equivalent measurement method for wave distortion Annex E (Normative) Holder of specimens for impact resistance test Annex F (Normative) Test apparatus for shot-bag impact test Annex G (Normative) Test method for bending strength Annex H (Informative) Calibration of the frame for shot-bag impact test Bibliography