[Abstract] English name: Safety glazing materials in building Part2: Tempered glass
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on 2005-08-30 and implemented on 2006-03-01
Standard number: GB15763.2-2005

Foreword
GB 15763 "Safety Glass for Construction" is currently divided into two parts:
--Part 1: Fireproof glass;
--The second part: Tempered glass.
This part is Part 2 of GB 15763.
The 5. 5, 5. 6, and 5. 7 of this part are mandatory clauses, and the other clauses are recommended clauses.
This part replaces GB/T 9963-1998 "Toughened Glass" and GB 17841-1999 "Toughened Glass and Semi-Toughened Glass for Curtain Walls" for the relevant regulations on tempered glass for curtain walls.
Compared with GB/T 9963-1998, the main changes in this part are as follows:
--This part is a mandatory standard, and GB/T 9963-1998 is a recommended standard;
-Modified the method and requirements of the debris test;
——The revision of the rules on cited documents: distinguish between dated and undated cited documents (GB/T 9963-1998, 2 and 2 of this part);
--- Added the classification of vertical tempered glass and horizontal tempered glass (3 of this part);
--Incorporate the requirements for surface stress and thermal shock resistance of toughened glass for curtain walls in GB 17841-1999, and modify the requirements for surface stress (5.4.1, 5.4.3, 6 of GB 17841-1999). 4, 6. 6; 5. 8, 5. 11, 6. 8, 6. 9 of this part;
--- Increase the size requirements for glass round holes (5.1.5 in this section);
---Modified the requirements of appearance quality;
--- The methods and requirements for transmittance and wind pressure resistance have been deleted;
--Modified the sampling rules;
--- Added explanations on the stress spots and self-explosion of tempered glass (Appendix A to this section).
Appendix A of this section is an informative appendix.
This part was proposed by the National Architectural Glass and Industrial Glass Association.
This part is under the jurisdiction of the National Technical Committee for Standardization of Building Glass.
The units responsible for drafting this section: China Academy of Building Materials Science Research Institute, Qinhuangdao Glass Industry Design and Research Institute, Building Materials Industry Technology Supervision and Research Center.
Participated in the drafting of this section: Shenzhen CSG Engineering Glass Co., Ltd., Guangdong King Kong Glass Technology Co., Ltd., Ningbo Jianghua Xinyi Safety Glass Co., Ltd., and Wuxi Xinhui Glass Products Co., Ltd.
The main drafters of this section: Yang Jianjun, Qiu Guohong, Han Song, Mo Jiao, Gong Shuyi, Wang Rui, Liu Zhifu, Li Jinping, Zhu Mei, Ai Fazhi, Wu Dehua, Zhuang Dajian, Xia Weiwen.
The previous releases of the standards replaced by this part are: JC 293-82 "Flat Tempered Glass", GB 9963-88 "Toughened Glass", GB/T 9963-1998 "Toughened Glass"; GB 17841-1999 "Toughened Glass for Curtain Walls" The part about toughened glass for curtain wall in "Glass and Semi-Toughened Glass".

    Building safety glass
    Part 2: Tempered glass Safety glazing materials in building Part 2: Tempered glass
1. Scope
    This part of GB15763 specifies the classification, technical requirements, test methods and inspection rules of building tempered glass made by heat treatment process .
    This part of GB15763 applies to toughened glass for construction made by heat treatment process. For tempered glass used outside of construction (such as industrial equipment, furniture, etc.), if there is no corresponding product standard, this standard can be used according to its product characteristics.
 2 2 Normative Reference Documents
    The clauses in the following documents have become clauses of this part after being quoted in this part. For dated reference documents, all subsequent amendments (excluding errata content) or revisions do not apply to this standard. However, all parties that have reached an agreement based on this section are encouraged to study whether the latest versions of these documents can be used . For undated reference documents, the latest version is applicable to this section.
    GB 9962-1999 Laminated glass
    GB 11614 Float glass
    GB/T 18144 Glass stress test method
3. Definition and classification
 3.1 Definition
    Tempered glass: glass after heat treatment. Its characteristic is that a compressive stress layer is formed on the surface of the glass, the mechanical strength and thermal shock resistance are improved, and it has a special fragment state.
 3.2 Classification
  3.2.1 Toughened glass is classified according to the production process, and can be divided into:
    Vertical tempered glass: Tempered glass produced by the way of clamp hanging during the tempering process.
    Horizontal tempered glass: tempered glass produced by horizontal roller support during the tempering process.
  3.2.2 Toughened glass is classified according to its shape, divided into flat toughened glass and curved toughened glass.
4. Glass used in
　tempered glass 　The quality of the glass used in the production of tempered glass should meet the requirements of the corresponding product standards. For those with special requirements, the quality of the glass used in the production of tempered glass shall be determined by both the supplier and the buyer.
5. Requirements
　The properties and test methods of tempered glass should meet the requirements of the corresponding clauses in Table 1. The safety performance requirements are mandatory requirements.
 
 
Table 1: Technical requirements and test method terms
Name Technical requirements Test method
Dimensions and appearance requirements Dimensions and their allowable deviations 5.1 6.1
 Thickness and allowable deviations 5.2 6.2
 Appearance quality 5.3 6.3
 Bend 4 5.4 6.4
Safety performance requirements Bend 5.5 6.5
 Fragment state 5.6 6.6
 Shotgun impact performance 5.7 6.7
General performance requirements Surface stress 5.8 6.8
 Thermal shock resistance 5.9 6.9
  5.1 Allowable size and allowable deviation
   5.1.1 Permissible deviation
 　of the side length of rectangular flat tempered glass The allowable deviation of the side length of rectangular flat tempered glass should meet Table 2 Regulations
 
 
Table 2: Allowable deviation of side length of rectangular plane tempered glass (unit: mm) Allowable deviation of
thickness side length (L)
 L≤1000 1000＜L≤2000 2000＜L≤3000 L>3000
3,4,5, 6 +1
-2 ±3 ±4 ±5
8,10,12 +2
-3   
15 ±4 ±4  
19 ±5 ±5 ±6 ±7
>19 The supplier and the demander agree upon
 
  5.1.2 The diagonal difference of the rectangular flat tempered glass
　should meet the requirements of Table 3.
 
 
Table 3: Allowable value of diagonal difference of rectangular flat tempered glass (unit: mm)
Nominal thickness of glass side length (L) allowable deviation
 L≤2000 2000<L≤3000 L>3000
3,4,5,6 ±3.0 ±4.0 ±5.0
8,10,12 ±4.0 ±5.0 ±6.0
15,19 ±5.0 ±6.0 ±7.0
>19 To be agreed between the
  supplier and the demander 5.1.3 The size and allowable deviation of tempered glass of other shapes 　to be agreed between the supplier and the
　demander.
  5.1.4 Edge
　processing 　The shape and quality of the edge processing shall be negotiated between the    supplier and the buyer .
  5.1.5 Round holes
5.1.5.1 Overview
　This article is only applicable to tempered glass with a nominal thickness of not less than 4mm. The processing quality of the edge of the round hole is determined by the supplier and the buyer.
   5.1.5.2 Aperture 　The
　aperture is generally not less than the nominal thickness of the glass, and the allowable deviation of the aperture should meet the requirements of Table 4. The allowable deviation of the hole diameter of the hole smaller than the nominal thickness of the glass shall be negotiated between the supplier and the buyer.
 
 
Table 4: Aperture and allowable deviation (unit: mm)
Nominal aperture allowable deviation
4≤D≤50 ±1.0
250<D≤100 ±2.0
D>100 The supplier and the buyer agree upon
 
   5.1.5.3 The position of the hole
　1) The distance a between the edge of the hole and the edge of the glass should not be less than 2 times the nominal thickness of the glass. As shown in Figure 1.
　Standard name:
　Safety glazing materials in building Part 2: Tempered glass　English name: Safety glazing materials in building Part2: Tempered glass The
　General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China issued on
　August 30, 2006-03-01 Implementation Standard Number: GB15763. 2-2005
 
 
Preface
　GB 15763 "Safety Glass for Construction" is currently divided into two parts: ——Part
　1: Fireproof glass; ——Part
　2: Tempered glass.
        This part is Part 2 of GB 15763.
        5.5, 5.6, and 5.7 of this section are mandatory clauses, and other clauses are recommended clauses.
        This part replaces GB/T 9963-1998 "Toughened Glass" and GB 17841-1999 "Toughened Glass and Semi-Toughened Glass for Curtain Walls" for the relevant regulations on tempered glass for curtain walls.
        Compared with GB/T 9963-1998, the main changes of this part are as follows: ——This part
        is a mandatory standard, and GB/T 9963-1998 is a recommended standard; ——The
        method and requirements of the fragment test are modified ; ——About
        reference The document’s rules were revised to distinguish between dated and undated reference documents (GB/T 9963-1998, 2, and 2 of this part);

        ——Increase         the classification of vertical method tempered glass and horizontal method tempered glass (3 of this part); ——Incorporate the requirements for surface stress and thermal shock resistance of tempered glass for curtain wall in GB 17841-1999, and modify the surface stress Requirements (5.4.1, 5.4.3, 6.4, 6.6 of GB 17841-1999; 5.8, 5.11, 6.8, 6.9 of this part); ——The
        size requirements for glass round holes are added (5.1.5 of this part) );         ——The
        requirements for appearance quality are modified;
——The methods and requirements for transmittance and wind pressure resistance are deleted;
        ——Sampling rules are modified;
        ——The description of stress spots and self-explosion of tempered glass is added ( Appendix A to this section).
        Appendix A of this section is an informative appendix.
        This part was proposed by the National Architectural Glass and Industrial Glass Association.
        This part is under the jurisdiction of the National Technical Committee for Standardization of Building Glass.
        Responsible for the drafting of this section: China Academy of Building Materials Science Research Institute, Qinhuangdao Glass Industry Design and Research Institute, Building Materials Industry Technology Supervision and Research Center.
        Participated in the drafting of this section: Shenzhen CSG Engineering Glass Co., Ltd., Guangdong King Kong Glass Technology Co., Ltd., Ningbo Jianghua Xinyi Safety Glass Co., Ltd., and Wuxi Xinhui Glass Products Co., Ltd.
        The main drafters of this section: Yang Jianjun, Qiu Guohong, Han Song, Mo Jiao, Gong Shuyi, Wang Rui, Liu Zhifu, Li Jinping, Zhu Mei, Ai Fazhi, Wu Dehua, Zhuang Dajian, Xia Weiwen.
        The previous releases of the standards replaced by this part are: JC 293-82 "Flat Tempered Glass", GB 9963-88 "Toughened Glass", GB/T 9963-1998 "Toughened Glass"; GB 17841-1999 "Toughened Glass for Curtain Walls" The part about toughened glass for curtain wall in "Glass and Semi-Toughened Glass".
        Building safety glass
        Part 2: Tempered glass Safety glazing materials in building Part 2: Tempered glass
        1 Scope
        This part of GB15763 specifies the classification, technical requirements, test methods and inspection rules of building tempered glass made by heat treatment.
        This part of GB15763 applies to toughened glass for construction made by heat treatment process. For tempered glass used outside of construction (such as industrial equipment, furniture, etc.), if there is no corresponding product standard, this standard can be used according to its product characteristics.
        2 2 Normative Reference Documents
        The clauses in the following documents have become clauses of this part after being quoted in this part. For dated reference documents, all subsequent amendments (excluding errata content) or revisions do not apply to this standard. However, all parties that have reached an agreement based on this section are encouraged to study whether the latest versions of these documents can be used . For undated reference documents, the latest version is applicable to this section.
        GB 9962-1999 Laminated glass
        GB 11614 Float glass
        GB/T 18144 Glass stress test method
        3 Definition and classification
        3.1 Definition
        Tempered glass: the glass after the heat treatment process. Its characteristic is that a compressive stress layer is formed on the surface of the glass, the mechanical strength and thermal shock resistance are improved, and it has a special fragment state.
        3.2 Classification
        3.2.1 Toughened glass is classified according to the production process, and can be divided into:
        Vertical tempered glass: Tempered glass produced by the way of clamp hanging during the tempering process.
        Horizontal tempered glass: tempered glass produced by horizontal roller support during the tempering process.
        3.2.2 Toughened glass is classified according to its shape, divided into flat toughened glass and curved toughened glass.
        4 Glass used in
         tempered glass The quality of the glass used in the production of tempered glass should meet the requirements of the corresponding product standards. For those with special requirements, the quality of the glass used in the production of tempered glass shall be determined by both the supplier and the buyer.
        5 It is required
        that the properties and test methods of tempered glass should meet the requirements of the corresponding clauses in Table 1. The safety performance requirements are mandatory requirements.
        Table 1 Technical requirements and test method terms
Name Technical requirements Test method
Dimensions and appearance requirements Dimensions and their allowable deviations 5.1 6.1
 Thickness and allowable deviations 5.2 6.2
 Appearance quality 5.3 6.3
 Curvature 4 5.4 6.4
Safety performance requirements Curvature 5.5 6.5
 Fragment state 5.6 6.6
 Shotbag impact performance 5.7 6.7
General performance requirements Surface stress 5.8 6.8
 Thermal shock resistance 5.9 6.9
 
        5.1 Allowable dimensions and allowable deviations
        5.1.1 Allowable deviations
        of side length of
        rectangular flat tempered glass The unit is mm)
Thickness side length (L) allowable deviation
 L≤1000 1000＜L≤2000 2000＜L≤3000 L>3000
3,4,5,6 +1
-2 ±3 ±4 ±5
8,10,12 +2
-3   
15 ±4 ±4  
19 ±5 ±5 ±6 ±7
>19 The supplier and the demander agree upon
 
        5.1.2 The diagonal difference of the rectangular flat tempered glass
        shall meet the requirements of Table 3.
        Table 3 Allowable value of diagonal difference of rectangular plane tempered glass (unit: mm)
Nominal thickness of glass side length (L) allowable deviation
 L≤2000 2000<L≤3000 L>3000
3,4,5,6 ±3.0 ±4.0 ± 5.0
8,10,12 ±4.0 ±5.0 ±6.0
15,19 ±5.0 ±6.0 ±7.0
>19 To be agreed between the
 
        supplier and the demander 5.1.3 The size and allowable deviation of tempered glass of other shapes shall be
        negotiated by the supplier and the demander.
        5.1.4 Edge
         processing The shape and quality of edge processing shall be negotiated between the         supplier and the buyer .
        5.1.5 Round hole
5.1.5.1 General
         This article is only applicable to tempered glass with a nominal thickness of not less than 4mm. The processing quality of the edge of the round hole is determined by the supplier and the buyer.
        5.1.5.2 Aperture The
         aperture is generally not less than the nominal thickness of the glass, and the allowable deviation of the aperture should meet the requirements of Table 4. The allowable deviation of the hole diameter of the hole smaller than the nominal thickness of the glass shall be negotiated by the supplier
         and the demander. Table 4 Hole diameter and allowable deviation (in millimeters)
Nominal diameter allowable deviation
4≤D≤50 ±1.0
250<D≤100 ±2.0
D>100 Both supply and demand It is agreed that
 
 
        5.1.5.3 position of the hole
        1) The distance a between the edge of the hole and the edge of the glass shall not be less than 2 times the nominal thickness of the glass.
 
        2) The distance b between the edges of the two holes should not be less than 2 times the nominal thickness of the glass.
 
        3) The distance c between the edge of the hole and the corner of the glass should not be less than 6 times the nominal thickness d of the glass.
        Note: If the distance between the edge of the hole and the corner of the glass is less than 35mm, then the hole should not be in a symmetrical position with respect to the corner. The specific location is negotiated by both the supply and demand parties.
 
        4) The method of
      expressing the position of the center of the circle and its allowable deviation establish a coordinate system, and the position of the center of the circle (x, y) is used to express the position of the center of the circle. The allowable deviation of the position x and y of the center of the circular hole is the same as the allowable deviation of the side length of the glass (see Table 2).
 
        5.2 Thickness and its allowable deviation
        5.2.1 The allowable deviation of the thickness of tempered glass should meet the requirements of Table 5.
        Table 5 Thickness and its allowable deviation (in millimeters) The
allowable deviation of the nominal thickness of glass
3,4,5,6 ±0.2
8,10 ±0.3
12 ±0.4
15 ±0.6
19 ±1.0
>19 To be agreed by both the
 
        supplier and the demander 5.2.2 For For glass with a nominal thickness that is not specified in Table 5, the allowable deviation of thickness can be specified by the thinner glass adjacent to it in Table 5, or be negotiated by both the supplier and the buyer.
        5.3 Appearance quality The appearance quality of
        toughened glass should meet the requirements of Table 6.
        5.4 Curvature The curvature of
        flat toughened glass should not exceed 0.3% when it is bowed, and it should not exceed 0.2% when it is corrugated.
        5.5 Impact resistance
        Take 6 pieces of tempered glass for the test, and the number of damage of the sample is less than 1 piece as qualified, and more than or equal to 3 pieces as unqualified.
        When the number of damages is 2 pieces, another 6 pieces shall be taken for the test, and all the samples must not be damaged as qualified.
Defect name Description allowable number of defects
burst edge Each piece of glass per meter side length is allowed to have a length not exceeding 10mm, extending from the edge of the glass to the surface of the glass plate not exceeding 2mm, and extending from the plate to the glass thickness not exceeding 1/3 of the thickness The number of burst edges. 1
A slight scratch with a scratch width of less than 0.1mm, and the number of edges per square meter is allowed. Length≤100mm
4 strips
 Scratch width greater than 0.1mm, the number of allowed per square meter area. 1mm width 0.1
length ≤100mm
 
. 4 strips
from the edge of the glass plate clamp clamps the printing ≤20mm, deformation of the edge portion ≤2mm (see FIG. 5)
cracks, chipping does not allow the presence of
 
 
1. deformed edge portion
from the edge of the glass plate 2. the clamp
3. the clamp plate
5 a schematic view of the clamp plate
 
        5.6 state of fragmentation
         takes four glass test samples, each test The minimum number of fragments in any 50mm×50mm area must meet the requirements of Table 7. And a small number of long strips are allowed, the length of which does not exceed 75mm.
Nominal thickness of glass type/mm Minimum number of fragments/piece
Flat tempered glass 3 30
 4~12 40
 ≥15 30
Curved tempered glass ≥4 30
 
        5.7 Shot bag impact performance
         Take 4 flat tempered glass samples for testing, which must meet the following ( 1) or (2).
        (1) When the glass is broken, the total mass of the maximum 10 pieces of each sample shall not exceed the mass equivalent to the 65m2 area of ​​the sample.
        (2) When the drop height of the loose ammunition bag is 1200mm, the sample will not be damaged.
        5.8 Surface stress The surface stress of
        tempered glass should not be less than 90MPa.
        Take the product as a sample, take 3 samples for testing, when all meet the requirements, it is qualified, if 2 samples do not meet, then it is unqualified. When 2 samples meet the requirements, add 3 more samples, if 3 All compliance with the regulations is considered qualified.
        5.9 Thermal shock resistance Tempered glass should be resistant to 200℃ temperature difference without being damaged.
        Take 4 samples for the test. When all 4 samples meet the requirements, the performance is considered qualified. When there are more than 2 non-conformances, it is considered disqualified. When there is one non-compliance, another sample is added. If it meets the requirements, the performance is considered qualified. When there are 2 non-conformances, 4 new samples are added, and when all conform to the regulations, it is qualified.
        6. Test method
        6.1 Dimension inspection The
        dimension shall be measured with a steel ruler or steel tape with a minimum scale of 1mm.
        6.2 Thickness inspection shall
        use an outer diameter dry ruler or an instrument with the same accuracy, at the midpoint of the four sides within 15mm from the edge of the glass plate Measurement. The arithmetic average of the measurement results is the thickness value. And round off to 2 decimal places in millimeters (mm).
        6.3 The appearance inspection
        takes the product as the sample, and shall be carried out according to the method of GB 11614.
        6.4 Curvature measurement
        Put the sample at room temperature for more than 4 hours, and place the sample vertically during measurement, and place 2 pads on 1/4 of its long side. Use a straight ruler or metal wire to close the two sides or diagonal direction of the product horizontally, use a feeler gauge to measure the gap between the straight edge and the glass, and use the percentage of the ratio of the height of the arc to the length of the string to express the bow when the bow Spend. When measuring partial waveforms, use a straight ruler or a metal wire to measure along the 25mm direction parallel to the edge of the glass, and the measurement length is 300mm. Measure the height of the wave trough or wave crest with a feeler gauge and divide it by 300mm to indicate the curvature of the wave, as shown in Figure 6.
        6.5 Impact resistance test
        6.5.1 The sample is of the same thickness and type as the product, and the size of the product manufactured under the same process conditions is 610 mm (-0mm, +5mm) × 610mm (-0mm, +5mm) Flat tempered glass.
        6.5.2 The test device should meet the requirements of Appendix A of GB 9962-1999. Keep the impact surface level. When testing curved tempered glass, it is necessary to use the corresponding auxiliary frame support.
        6.5.3 Use a steel ball with a diameter of 63.5 mm (mass about 1040 g) with a smooth surface and place it at a height of 1000 mm from the surface of the sample to make it fall freely. The impact point should be within 25 mm from the center of the specimen. The impact on each sample is limited to one time to observe whether it is damaged. The test is carried out at room temperature.
        6.6 Fragment state test
        6.6.1 Take the product as a sample.
        6.6.2 Test equipment
         Any device that can retain the fragment pattern.
        6.6.3 Test procedure
        6.6.3.1 Place the tempered glass sample freely and flatly on the test bench, and use scotch tape or other means to restrain the periphery of the glass to prevent glass fragments from splashing.
        6.6.3.2 At a position about 20 mm from the periphery on the center line of the longest side of the sample, impact with a small hammer or punch with a tip curvature radius of 0.2 mm + 0.05 mm to break the sample.
        6.6.3.3 The measures to retain the fragment pattern shall start 10s after the impact and end within 3min after the impact.
 
1. Bow shape deformation
2. Glass side length or diagonal length
3. Wave shape deformation;
4. 300mm
Figure 6 Schematic diagram of bow and wave curvature
 
        6.6.3.4 When counting debris, the part within the radius of 80mm from the impact point and 25mm from the edge of the glass or the edge of the hole shall be removed. Select the part with the largest fragment from the pattern. In this part, a 50mm×50mm counting frame is used to calculate the number of fragments in the frame. There must be no penetrating cracks in each fragment. The fragments that cross the edge of the counting frame are counted as 1/2. Fragment calculation.
        6.7 Impact performance test of loose ammunition bag
        6.7.1 The sample
         is the same thickness as the product and manufactured under the same process conditions as the product with a size of 1930mm (-0mm, +5mm) × 864mm (-0mm, +5mm) Rectangular flat tempered glass.
        6.7.2 Test device The
         test device should meet the requirements of Appendix B of GB 9962-1999.
        6.7.3 Test procedure
        6.7.3.1 Lift the impact body with a flexible steel wire rope with a diameter of 3 mm so that the outer circumference of the largest diameter part of the cross section of the impact body is less than 13 mm from the sample surface and within 50 mm from the center of the sample.
        6.7.3.2 Keep the center position of the maximum diameter of the impact body at a drop height of 300 mm, swing freely, and impact once near the center point of the sample. If the sample is not damaged, raise it to 750 mm, and impact once again near the center point of the same sample.
        6.7.3.3 When the specimen is still intact, it shall be raised to a height of 1200 mm, and an impact shall be made near the center point of the same specimen.
        6.7.3.4 When a specimen with a drop height of 300mm, 750mm or 1200mm is destroyed, within 5 minutes after the destruction, select the largest 10 pieces from the glass fragments and weigh their mass. And measure the length of the longest glass fragment with no penetrating cracks remaining in the frame.
 
        6.8 Surface stress measurement
        6.8.1 Sample Take the product as the sample, and proceed according to the method specified in GB/T 18144.
        6.8.2 Requirements for measuring points
        At a distance of 100mm from the long side, draw 2 parallel lines parallel to the long side and intersect the diagonal at 4 points. These 4 points and the geometric center point of the product are the measuring points. .
 
 
        If the length of the short side of the product is less than 300mm, draw two parallel lines parallel to the short side at a distance of 100mm from the short side and intersect the center line at 2 points. These two points and the geometric center point of the product are the measuring points.
        For products with irregular shapes, the stress measurement point shall be negotiated between the supplier and the buyer.
        6.8.3 Measurement results The
        measurement result is the arithmetic average of the measured values ​​of each measuring point.
        6.9 Thermal shock resistance Put a 300mm×300mm tempered glass sample in an oven at 200°C±2°C for more than 4 hours. After taking it out, immediately immerse the sample in a 0°C ice-water mixture. The height of the sample should be ensured. More than 1/3 of the glass can be immersed in water, and observe whether the glass is broken after 5 minutes.
        The scale-like peeling of the glass surface and edges shall not be regarded as damage.
        7 Inspection rules
        7.1 Inspection item
         inspection is divided into factory inspection and type inspection.
        7.1.1 The safety performance requirements in the technical requirements for type inspection are mandatory inspection items, and the remaining requirements shall be negotiated by both the supplier and the buyer.
        7.1.2 Ex-factory inspection of thickness and deviation, appearance quality, size and deviation, and curvature. Other inspection items shall be negotiated between the supplier and the buyer.
        7.2 Batch sampling method
        7.2.1 The size and deviation, appearance quality, and curvature of the product shall be randomly sampled according to Table 8.
        Table 8 Sampling table (unit is piece)
Batch range Sample size Pass judgment number Unqualified judgment number
1~8 2 1 2
9~15 3 1 2
16~25 5 1 2
26~50 8 2 3
51~90 13 3 4
91~150 20 5 6
151~280 32 7 8
281~500 50 10 11
501~1000 80 14 15
 
        7.2.2 For other technical performance required by the product, if the product is inspected, the quantity required by the test item The batch of products is randomly selected; if a sample is used for inspection, the sample prepared under the same process conditions should be used. When the batch of products is larger than 500 pieces, samples are taken in batches with 500 pieces as a batch. When the inspection item is a non-destructive test, it can be used to continue the inspection of other items.
        7.3 Judgment rules
         If the number of unqualified products is equal to or greater than the number of unqualified judgments in Table 8, the batch of products shall be deemed unqualified in terms of appearance quality, dimensional deviation, and curvature.
         Other properties should also meet the requirements of the corresponding clauses, otherwise, the item is deemed unqualified.
         If one of the above items is unqualified, the batch of products is deemed unqualified.
       8 Marking, packaging, transportation and storage
       8.1 Packaging
         The glass packaging should be packed in wooden boxes or containers (rack), and the box (rack) should be convenient for loading, unloading and transportation. Each box (rack) should be equipped with glass of the same thickness and size. Protective measures should be taken between the glass and the glass and between the glass and the box (rack) to prevent damage to the glass and scratches on the glass surface.
        8.2 Packaging mark The
         packaging mark shall comply with the relevant national standards, and each packaging box shall be marked with signs or words such as "face up, carry lightly and place it upright, be careful of breaking, and prevent rain and moisture".
        8.3 During transportation
         , the glass should be fixed firmly to prevent sliding and falling, and rain-proof measures should be taken.
        8.4 Storage The
        product should be stored in a place with no condensation or rainproof facilities.