GB/T 17841-2008 English PDF (GBT17841-2008)

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GB/T 17841-2008: Heat strengthened glass
GB/T 17841-2008
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 
3.1 Heat strengthened glass ... 5 
4 Classifications ... 5 
5 Materials ... 6 
6 Requirements ... 6 
6.1 Thickness deviation ... 6 
6.2 Dimensions and allowable deviation ... 6 
6.3 Edge quality ... 9 
6.4 Appearance quality ... 9 
6.5 Tortuosity ... 9 
6.6 Bending strength ... 10 
6.7 Surface stress ... 10 
6.8 Splinters statue ... 10 
6.9 Heat shock resistance ... 11 
7 Test Method ... 12 
7.1 Thickness inspection (test) ... 12 
7.2 Dimensions and allowable deviation ... 12 
7.3 Edge processing ... 12 
7.4 Visual testing ... 12 
7.5 Measurement of tortuosity ... 13 
7.6 Bending strength ... 13 
7.7 Surface stress ... 13 
7.8 Splinters state test ... 13 
7.9 Heat shock resistance ... 15 
8 Test Rules ... 15 
8.1 Testing items ... 15 
8.2 Batch sampling method ... 16 
8.3 Decision rules ... 16 
9 Marking, Package, Transportation and Storage ... 17 
9.1 Package ... 17 
9.2 Packing mark ... 17 
9.3 Transportation ... 17 
9.4 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.
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.
3.1 Heat strengthened glass
Glasswork of which the surface is arranged with permanent compressive stress layer
through heating and cooling control, to make glass has more mechanical strength and
thermal shock resistance and special splinters statue.
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.
Table 1 Technical requirements and test method
Items Technical requirements Test method
Thickness Deviation 6.1 7.1
Dimensions and allowable deviation 6.2 7.2
Edge quality 6.3 7.3
Appearance quality 6.4 7.4
Tortuosity 6.5 7.5
Bending strength 6.6 7.6
Surface stress 6.7 7.7
Splinters statue 6.8 7.8
Heat shock resistance 6. 9 7.9
6.1 Thickness deviation
The Thickness deviation of the products shall meet the requirements of the standards
applying the adopted glass ...