GB/T 17841-2008 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 17841-2008 | English | 85 |
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Heat strengthened glass
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| GB 17841-1999 | English | 319 |
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Tempered and heat--strengthened glass used in curtain wall
| Obsolete |
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GB/T 17841-2008: Heat strengthened glass---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/GBT17841-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.040.20
Q 34
Replacing GB 17841-1999
Heat Strengthened Glass
Issued on. OCTOBER 15, 2008
Implemented on. JUNE 1, 2009
Jointly issued by. General Administration for Quality Supervision and
Inspection and Quarantine (AQSIQ) of PRC;
State Standardization Administration of PRC (SAC).
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Classifications... 5
5 Materials... 6
6 Requirements... 6
7 Test Method... 12
8 Test Rules... 15
9 Marking, Package, Transportation and Storage... 17
Annex A... 18
Foreword
The consistent degree BETWEEN this Standard AND EN 1863-1.2000 "Glass in
Building - Heat Strengthened Soda Lime Silicate Glass - Part 1.Definition and
Description" and EN 1863-2.2004 "Glass in building - Heat strengthened soda lime
silicate glass - Part 2.Evaluation of conformity/Product standard" is not equivalent.
This Standard also refers to ASTM C 1048-04 "Standard Specification for
Heat-Treated Flat Glass - Kind HS, Kind FT Coated and Uncoated Glass".
This Standard replaces GB 17841-1999 "Tempered and heat-strengthened glass
used in curtain walls". Compared with GB 17841-1999, the main technical differences
are as follows.
— Delete the technical requirements in toughened glass;
— Delete the technical requirements in wind resistance Property; and add the
technical requirements in splinters statue and bending strength;
— Add the technical requirements on "ones which the side length is larger than
3000 mm" in the dimension and allowable deviation; and add the technical
requirements to round hole;
— Add the requirements of edge-crack defect allowance to appearance quality
items;
— Delete the requirements of heat strengthened glass Perpendicularity method to
tortuosity factor items;
— Add Annex A (Normative).
Annex A of this Standard is normative.
This Standard was proposed by China Building Materials Federation.
This Standard shall be under the jurisdiction of the State Standardization Committee
of Building Glass.
Drafting organization of this Standard. China Building Material Test and Certification
Center (CTC).
Participating drafting organizations of this Standard. GUANGDONG GOLDEN GLASS
TECHNOLOGIES LTD., Hehe Holding Group Co., Ltd., Zhejiang Zhongli Holding
Group Co., Ltd., Jiangsu Xiuqiang Glass Technology Co., Ltd., China South Glass
(CSG) Holding Limited, Shanghai Yaohua Pilkington Glass Co., Ltd., Beijing WuHua
TianBao Glass CO., LTD., Jiangmen Yinhui Safety Glass Industry Co., Ltd.,
Hangzhou Qiantangjiang Glass Industry Co., Ltd.
Chief Drafting staffs of this Standard. Wu Huiyan, Shi Xinyong, Wang Wenbiao, Xiao
Weiwen, Wu Congzhen, Sun Dahai, Ai Fazhi, Long Linxing, Yang Hongbin, Chen
Xinsheng, Zhou Jian, Ping Baizhan, Yang Jianhua, Jia Xiangdao, Zhao Wei, Qiu
Juan.
The previous edition replaced by this Standard is as follows.
- GB 17841-1999.
Heat Strengthened Glass
1 Scope
This Standard specifies terms and definitions, classification, technical requirements,
test method, test rules and marking, Package and transportation and storage of heat
strengthened glass made by the heat treatment.
This Standard is applicable to heat strengthened glass for building made by heat
treatment. The heat strengthened glass for other purpose except building may
reference to this Standard according to the characteristics of the products.
2 Normative References
The following standards contain provisions which, through reference in this text,
constitute provisions of this Standard. For dated references, the subsequent
amendments or revisions of these publications do not apply. However, parties who
enter into agreement based on this part are encouraged to investigate the possibility
of applying the most recent edition of the normative document indicated below. For
undated references, the latest edition of the normative document referred to applies.
GB/T 1216 External micrometer
GB/T 8170 Rules for Rounding Off Of Numerical Values
GB 15763.2-2005 Safety Glazing Materials in Building - Part 2.Tempered Glass
3 Terms and Definitions
The following terms and definitions apply in this Standard.
4 Classifications
Based on production process, heat strengthened glass may be classified as heat
strengthened glass made with perpendicularity method and heat strengthened glass
made with horizon method.
5 Materials
The quality of the glass sheets for producing heat strengthened glass shall meet the
requirements the related product standards.
6 Requirements
Property items and test methods of Heat strengthened glass shall meet the
requirements of the items in Table 1.
6.1 Thickness deviation
The Thickness deviation of the products shall meet the requirements of the standards
applying the adopted glass sheets.
6.2 Dimensions and allowable deviation
6.2.3 Round hole
6.2.3.1 General
This article is only applicable to the products of which the normal thickness is not less
than 4mm. The edge processing quality of round hole shall be negotiated by the
supplying and demanding parties.
6.5 Tortuosity
The tortuosity factor of flat product made with horizon method shall meet the
requirements of Table 6; the tortuosity factor of flat product with perpendicular method
shall be negotiated by the supplying and demanding parties.
6.7 Surface stress
Inspected in accordance with 7.7, the surface stress shall meet the requirements in
Table 8.
6.8 Splinters statue
The splinters statue of the glass of which the thickness is not larger than 8mm shall be
inspected in accordance with 7.8; the splinters statue of each test sample shall meet
the requirements in 6.8.1.The splinters statue of the glass of which the thickness is
larger than 8mm shall be negotiated by the supplying and demanding parties.
6.8.1 Requirements in splinters statue
6.8.1.1 At least a side of splinter shall extend into non-inspection area.
6.8.2 Acceptance provisions of splinters statue
6.8.2.1 At least a side of splinter shall extend into non-inspection area.
6.8.2.2 When all sides of splinter are not able to extend into the non-inspection area,
then this splinter is classified into "islet" splinter and "grain" splinter.
Above-mentioned splinter shall meet the following requirements.
6.9 Heat shock resistance
This article shall be negotiated by the supplying and demanding parties, and
inspected in accordance with 7.9.The test sample can resist the temperature
difference of 100°C without damage.
7 Test Method
7.1 Thickness inspection (test)
With outer-diameter micrometer (meet the requirements of GB/T1216) or the
instrument with same precision, measure the test sample (product) on center-points of
four sides 15 mm from the edge.
7.2 Dimensions and allowable deviation
7.2.1 Inspection of Side length allowable deviation
With straight steel ruler or steel tape of which the minimum scale is 1mm, measure the
test sample (from products).
tape with the minimum scale of 1mm.
7.3 Edge processing
Under the condition of good natural light or scattered light, do visual test on the
position 600mm away from the front of the test sample (from products).
7.4 Visual testing
Under the condition of good natural light or scattered light, do visual test on the
position 600mm away from the front of the test sample (from products).
7.5 Measurement of tortuosity
Before the measurement, place test sample (from products) under room temperature
for 4h or more; for the measurement, place the test sample vertically; arrange two
cushion blocks on the 1/4 lower position of the test sample; cling a ruler or metal wire
on two sides of diagonal; measure the distance between the straight line and the
glass with thickness gauge; use the length ratio of arc height and the chord length to
indicate the tortuosity.
7.8 Splinters state test
7.8.1 test sample
The test sample (1100mm X 360mm) is same to the product in thickness and
technical conditions; it is rectangle flat pattern test sample without round hole and
groove.
7.8.2 Testing procedure
7.8.2.1 Lay test sample on test stand; restrain the periphery of the glass with scotch
tape or other means to prevent glass fragment from splashing.
7.8.2.3 Complete exposition or photographing within 5 min after crashing, as well as
counting and weighing of "islet" splinter and "grain" splinter.
7.8.2.4 In the inspection, the area in 100mm radius from the impact point and 25mm
away from the edge (hereafter referred to as "non-inspection area") shall be excluded.
If there is "islet" or "grain" splinter after crashing, counting and weighing of "islet"
splinter and "grain" splinter shall be completed within 5 min.
7.8.2.5 The weighing method is adopted to measure the area of "islet" and "grain"
splinter according to the following formula.
8 Test Rules
8.1 Testing items
Inspection refers to exit-factory inspection and type inspection.
8.1.1 Type inspection
The testing items cover all technical requirements specified in this Standard, except
bending strength and heat shock resistance. The type inspection shall be done if any
one of the following conditions occurs.
8.2 Batch sampling method
8.2.1 Random sampling shall be done for appearance quality, size (dimension),
allowable deviation, and tortuosity in accordance with the requirements in Table 9.
8.3 Decision rules
8.3.1 For inspection (test) of appearance quality, dimensions, allowable deviation,
and tortuosity, the result of the test item is accepted if the reject number is not larger
than the Acceptance Number in Table 9; the products of this batch are rejected if the
reject number is larger than the Acceptance Number in Table 9.
8.3.2 For bending strength test, all test samples shall meet the requirements;
otherwise, the products are rejected.
8.3.3 For surface stress test, all test samples shall meet the requirements; otherwise,
the products are rejected.
9 Marking, Package, Transportation and Storage
9.1 Package
Glass shall be packaged with wooden case or container case (frame); and case
(frame) shall be convenient for loading, unloading and transporting. A case (frame)
shall be used for glass with same thickness and dimension.
9.2 Packing mark
The packing mark shall meet the requirements of the relevant national standards; the
marks or phrases like "Upward ", "Handle with care", and "Rain-proof and keep dry"
shall be indicated on each case.
9.3 Transportation
In the course of transportation, glass shall be fixed firmly to prevent slipping or
pumping; rain-proofing measures shall be available.
Annex A
(Normative)
Test Method of Bending Strength
A.1 Test conditions
Environmental temperature. 23°C±5°C; environmental humidity. 40%~ 70 %.
A.2 Test sample
Prepare at least 13 pieces of test samples for test. The test sample is 1100mm± 5mm
in length and 360mm± 5mm in width. In the preparation, the cutting points of parting
tool shall be on same surface of the test sample; and the edge shall be processed
with rough edge grinding.
The test samples shall be processed or treated within 24h before the test. if the shield
film is covered on test sample, it shall be wiped off 24 h before the test. Before the test,
the test samples shall be placed under the condition specified in A.1 for at least 4 h.
A.3 Test equipment
Material testing machine is adopted for test. The testing machine can load test sample
continually and evenly, and minimize shocking caused by loading. Testing machine
can be equipped with metering equipment and the error within its measurement range
shall be less than ±2%. The diameter support roller and loading roller shall be 50mm
and the length shall not be less than 365mm. Support roller and loading roller all can
rotate around the roll shaft line.
A.4 Test procedure
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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