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
