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GB/T 17841-2008: Heat strengthened glass Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 17841: Historical versions
Similar standardsGB/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/GBT17841-2008GB 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 ContentsForeword... 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... 18ForewordThe 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 Glass1 ScopeThis 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 ReferencesThe 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 Glass3 Terms and DefinitionsThe following terms and definitions apply in this Standard.4 ClassificationsBased 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 MaterialsThe quality of the glass sheets for producing heat strengthened glass shall meet the requirements the related product standards.6 RequirementsProperty 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 Method7.1 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 Rules8.1 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 Storage9.1 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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