State Bureau of Quality and Technical Supervision issued 1999-09-0 1 and 2000-0 1 for implementation.
order
The technical content of this standard adopts Japanese industrial technical standard JIS r 3222；; ; 1990 "Double Strength Glass", and refer to American ASTM C 1048: 1992 "Heat Treatment of Flat Glass -HS Class, FT Class Coated and Uncoated Glass" and draft EU standard CEN/TC129/WGZ/N76E:/.
This standard is applicable to flat tempered glass and semi-tempered glass of curtain wall, and specifies seven contents, such as size and deviation, appearance quality, curvature, surface stress, impact performance of shotgun bag, thermal shock resistance and wind pressure resistance, among which the surface stress is compiled according to ASTMC 1048, and the impact performance of shotgun bag refers to GB/T 9963- 148.
This standard was put forward by the State Bureau of Building Materials Industry.
This standard is under the jurisdiction of the Glass Science Research Institute of China Building Materials Science Research Institute.
The drafting unit of this standard: China Institute of Building Materials Science, Institute of Glass Science.
Participating drafting units: Shenzhen CSG Group Nanxing Glass Company, Zhuhai Xingye Safety Glass Co., Ltd. and China Hua Yao Glass Group Qinhuangdao Industrial Technology Glass Factory.
The main drafters of this standard are:, Shi Xinyong,,, Wang Yingzhou and Wu.
1 range
This standard specifies the size and deviation, appearance quality, curvature and performance requirements of tempered glass and semi-tempered glass for curtain wall. Suitable for flat toughened and semi-toughened glass products made of float glass. If it is compounded with other materials, its reprocessed products, such as sandwich, hollow or coating, the final product should also meet the standard requirements of the corresponding products.
This standard does not provide bending products.
2 reference standard
The clauses contained in the following standards constitute the clauses of this standard by reference in this standard. At the time of publication of this standard, all versions shown are valid. All standards will be revised, and all parties using this standard should explore the possibility of using the latest version of the following standards.
Gb/t1216-1985 outside micrometer (neq iso 3611:1978).
GB/T 9963- 1998 tempered glass (eav JIS R3206: 1989)
Gb11614-1999 float glass.
JC/T 632- 1996 terminology of automobile safety glass
JC/T 677- 1997 Simulated wind pressure test method for building glass under uniform static load
3 definition
This standard adopts the following definitions.
Semi-tempered glass: after heat treatment, the strength of glass is 1~2 times higher than that of ordinary glass, and the thermal shock resistance is significantly improved. Once broken, its broken state is similar to that of ordinary glass.
Other related definitions conform to JC/T 632.
Four species
4. 1 Tempered glass for curtain wall
4. 1. 1 tempered glass produced by horizontal method.
4. 1.2 Tempered glass produced by vertical method.
4.2 Semi-tempered glass for curtain wall
4.2. 1 semi-tempered glass produced by horizontal method.
4.2.2 Semi-tempered glass produced by vertical method.
5 requirements
Different kinds of products shall meet the requirements of the corresponding technical clauses in table 1.
Table 1 technical conditions and corresponding test methods
Test item toughened glass semi-toughened glass square method
The allowable deviation of size is 5. 1 5. 1 6. 1.
Appearance quality 5.2 5.2 6.2
Bending degree 5.3 5.3 6.3
Surface stress 5.4. 1 5.4. 1 6.4.
Impact Performance of Shotgun Bag 5.4.2—6.5
Thermal shock resistance
Wind pressure resistance 5.4.4 5.4.4 6.7
5. 1 Dimensions and deviations
5. 1. 1 nominal thickness and thickness deviation
The nominal thickness and deviation of tempered glass or semi-tempered glass products shall meet the requirements in Table 2.
Table 2 Nominal thickness and deviation mm
Nominal thickness deviation
Tempered glass semi-tempered glass
3 0.2 0.2
four
five
six
8 0.35 0.35
10
12 0.4 —
Note: The thickness difference of the same piece of glass shall not be greater than 0.20 mm.
5. 1.2 dimensional deviation
For rectangular tempered glass or semi-tempered glass products, the dimensional deviation shall comply with the relevant provisions in Table 3; For tempered glass or semi-tempered glass products with irregular shape and side length exceeding 3000mm, the dimensional deviation can be determined by both the supplier and the buyer.
Table 3 Dimensional deviation mm
dimensional deviation
Length of edge of nominal thickness
L≤ 1000 1000 < L≤2000 2000 & lt； L≤3000
3,4,5,6 + 1.0 - 1.0 + 1.0 -2.0 + 1.0 -3.0
8, 10, 12 + 1.0 -2.0 + 1.0 -3.0 +2.0 -4.0
5. 1.3 diagonal difference
For rectangular tempered glass or semi-tempered glass products, the diagonal difference shall comply with the provisions in Table 4; The diagonal difference of tempered glass or semi-tempered glass products with irregular shape and side length exceeding 3000mm can be agreed by both parties.
Table 4 Diagonal difference mm
Diagonal difference
Length of long side of nominal thickness
l≤2000 2000 & lt； L≤3000
3,4,5,6 ≤3.0 ≤4.0
8, 10, 12 ≤3.5 ≤4.5
5. 1.4 Edge deformation caused by vertical suspension method
Vertical hanging process will lead to edge deformation and hanging marks, as shown in figure 1. The maximum distance between the center of the hanging point and the edge is not more than 20mm, and the edge deformation is not more than 2 mm.
Figure 1
5.2 Appearance quality
The appearance quality of float glass used to produce tempered glass or semi-tempered glass products for curtain wall shall comply with the provisions of GB 1 16 14, and the appearance quality of the final product shall also comply with the provisions of Table 5; The boundary requirements should be agreed by the supply and demand sides.
Table 5 Appearance quality
The defect name indicates the number of defects allowed.
Edge explosion-not allowed.
Scratch width ≤0. 1mm, length ≤100 mm. The allowable number of scratches per square meter is 6.
0. 1 mm< width ≤0.5mm, length ≤ 100mm, and the allowed number of strips per square meter is 3.
Cracks and missing corners-not allowed
5.3 Bending degree
Curvature of bow deformation or wave deformation of tempered glass or semi-tempered glass shall meet the requirements in Table 6.
Table 6 Bending degree
Maximum value of defect name
Horizontal vertical method
Bow, mm/mm 0.3% 0.5%
Waveform, mm/300mm 0.2% 0.3%
5.4 performance
5.4. 1 surface stress
Take the product as a sample, and take three samples for testing. When they all meet the requirements in Table 7, they are qualified. When the two samples do not meet, it is unqualified. When two samples are satisfied, add three new samples. If all three samples meet the requirements in Table 7, they are qualified.
Table 7 Surface stress Mpa
Surface stress value in production process
Tempered glass semi-tempered glass
Horizontal method or vertical method σ≥ 95 24
5.4.2 Impact performance of shotgun bag
The impact performance of tempered glass shotgun meets the relevant provisions of 4.6 in GB/T9963- 1998.
Thermal shock resistance
Take 4 samples for test, and when all of them meet the requirements in Table 8, the performance is considered as qualified; When there are more than two unqualified, as unqualified; When one piece does not meet the requirements, add a new sample. If the requirements in Table 8 are met, the performance is considered qualified. When two pieces do not meet the requirements, four more pieces are added, all of which meet the requirements in Table 8.
Table 8 Thermal shock resistance
Production process type tempered glass semi-tempered glass
Horizontal method or vertical method will not destroy the temperature difference of 200℃ and 100℃.
Wind pressure resistance
The supplier and the buyer should decide whether it is necessary to carry out this test, so as to reasonably select tempered glass or semi-tempered glass with appropriate thickness under a given wind load, or to verify whether the thickness and area of the selected glass can meet the design requirements of wind pressure resistance.
6 test method
6. 1 Dimensions and deviations
6. 1. 1 size inspection
Measure with a steel tape.
6. 1.2 diagonal difference test
Measure the length of two diagonal lines of glass with a steel tape measure and get the difference.
6. 1.3 thickness inspection
Use a micrometer conforming to GB/T 12 16 or an instrument with equivalent precision to measure the midpoint of each side of the glass. If there is a hanging point, avoid measuring the arithmetic average of the edge measurement results within the range of 100mm from the center of the hanging point (see figure 1) as its thickness value, and trim it to two decimal places in millimeters.
6.2 Appearance inspection
Take the product as a sample, and inspect the product with naked eyes at a distance of 600 from the glass surface under good natural light or diffuse background lighting conditions.
6.3 Bending inspection
The product is hung upright at room temperature, and two gaskets are placed below 1/4 in its length direction, as shown in Figure 2a. Use a ruler or metal wire to cling to both sides of the product horizontally or diagonally, measure the gap between the ruler and the glass with a feeler gauge, and express the curvature of the bow with the percentage of arc height and vertical length; When measuring the local waveform, use a ruler to hold the glass edge waveform, use a feeler gauge to measure the height of the trough or peak, and divide by 300mm to indicate the curvature of the waveform, as shown in Figure 2b.
Figure 2
6.4 Surface Stress Measurement
Taking the product as a sample, the surface stress meter was used to measure it.
6.4. 1 Determination of surface stress measuring points
As shown in Figure 3, at the distance of 100mm from the long side, draw two parallel lines parallel to the long side and intersect the diagonal at four points, which is the measured point.
Figure 3
If the length of the short side of the product is less than 300mm, as shown in Figure 4, two parallel lines parallel to the short side intersect the center line at two points, and the geometric center point at a distance of 100mm from the short side is the measuring point. For products with irregular shapes, the stress measuring points shall be determined by both parties.
6.4.2 Structure of Surface Stress Instrument
The surface stress meter is mainly composed of light source system, high refractive prism and telescope system. The instrument structure is shown in Figure 5.
Figure 5
Measuring program
1. Place the tin diffusion layer of the glass to be tested upward and horizontally;
2. Drop a few drops of refractive index oil on the measured droplets;
3. Place the prism at the measured point;
4. Adjust the position of the light bulb and the angle of the reflector to make a step pattern with alternating light and dark appear in the field of vision;
5. Read the height d of the step with micrometer eyepiece, accurate to 0.00 1 mm..
calculate
The calculation formula of surface stress is as follows:
σ=d/L.cos(sin- 1 n/N)/C
Among them:
σ-surface stress, Mn/m2- or MPa
L-focal length of telescope, mm;
D- step height, mm;
N-refractive index of glass, n =1.5;
N-refractive index of prism;
C—— stress optical constant of glass, 2.6×10-6 (Mn/m2)-1.
6.5 Shotgun Bag Impact Performance Test
According to 5.7 in GB/T 9963- 1998.
6.6 Thermal shock performance test
Put a 300mm×300mm tempered glass sample in an oven at 200℃ 2℃ and a semi-tempered glass sample in an oven at 65438℃ 000℃ 2℃ for more than 4 hours. Immediately after taking out, immerse the sample in ice water at 0℃ vertically, and ensure that the height of the sample is more than 1/3, and observe whether the glass is damaged.
6.7 Wind pressure resistance performance test
Wind pressure resistance test shall be carried out according to JC/T 677.
7 inspection rules
7. 1 inspection items
7. 1. 1 type inspection: all inspection items in technical requirements.
7. 1.2 factory inspection: appearance quality, size and deviation, curvature. If other inspection items need to be added, it must be agreed by both parties.
7.2 sampling and batch organization rules
7.2. 1 The appearance quality, size, deviation and curvature of the product shall be randomly sampled as specified in Table 9.
Table 9 Sampling Block for Inspection of Appearance Quality, Size, Deviation and Curvature
Batch range sampling number qualified 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
5 1~90 13 3 4
9 1~ 150 20 5 6
15 1~280 32 7 8
28 1~500 50 10 1 1
7.2.2 For other technical performance required by the product, if the product is used for inspection, it shall be randomly selected from this batch of products according to the quantity required by the inspection items; If samples are used for inspection, samples prepared under the same process conditions should be used. When the batch of products exceeds 500 pieces, samples should be taken for every 500 pieces. When the inspection item is nondestructive testing, it can be used to continue the inspection of other items.
7.3 decision-making rules
If the nonconforming product is equal to or greater than the number of nonconforming judgments in Table 9, it is considered that the appearance quality, size, deviation and curvature of this batch of products are unqualified.
Other performances shall also comply with the provisions of the corresponding clauses, otherwise, the item shall be regarded as unqualified.
If one of the above items is unqualified, the batch of products will be regarded as unqualified.
8 Marking, packaging, transportation and storage
8. 1 packaging
Products should be packed in containers or wooden cases. Each piece of glass should be packed in plastic bags or paper, and the gap between the glass and the packing box should be filled with soft materials that are not easy to cause appearance defects such as glass scratches. Specific requirements shall conform to relevant national standards.
8.2 packing marks
The packaging mark shall conform to the provisions of relevant national standards, and the words "upward, handle with care, be careful of breaking, glass type, thickness, factory name or trademark" shall be marked on each packing box.
8.3 transportation
The transportation and loading and unloading rules and conditions of various vehicles used for products shall comply with the provisions of relevant national standards.
During transportation, wooden cases should not be laid flat, and the length direction should be consistent with the direction of vehicle movement, and rainproof measures should be taken.
8.4 storage
Products should be stored vertically in a drying room of the same type and thickness.