JG/T 402-2013 PDF in English
JG/T 402-2013 (JG/T402-2013, JGT 402-2013, JGT402-2013)
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Roofing products from metal sheet with reflect thermal coating
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JG/T 402-2013: PDF in English (JGT 402-2013) JG/T 402–2013
ICS 91.060.20
Q 73
PROFESSIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Roofing products from metal sheet with reflect
thermal coating
ISSUED ON. JANUARY 14, 2013
IMPLEMENTED ON. MAY 01, 2013
Issued by. The Ministry of Housing and Urban-Rural Development of the People’s
Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and definitions ... 5
4 Classification and mark ... 6
5 Requirements ... 7
6 Test methods ... 10
7 Inspection rules ... 14
Annex A (Normative) The solar light reflectance ratio and the
near-infrared reflectance ratio test method-Spectrophotometer method
... 18
Annex B (Normative) Determination of the thermal insulation
difference ... 21
References and Original Chinese Documents ... 25
Foreword
This Standard is prepared according to the rules specified in GB/T 1.1-2009.
This Standard is proposed by Research Institute of Standards & Norms of Ministry of
Housing and Urban-Rural Development.
This Standard is under the jurisdiction of National Technical Committee on Building
Components and Fittings of Standardization Administration of Ministry of Housing and
Urban-Rural Development.
The responsible drafting organizations are China Building Materials Inspection
Certification Group Co., Ltd and National Research Center of Testing Techniques for
Building Materials.
The participated drafting organizations are Hangzhou United Metaltek Industrial Holding
Co., Ltd, Beijing BIAM New Materials Technologies & Engineering Co. Ltd, Fujian Baihua
Chemical Co., Ltd, Shenzhen Radiant Industrial Co., Ltd, Shenzhen Grandland
Decoration Group., Co., Ltd, Shenzhen Jiada Hi-Tech Industry Development Co., Ltd,
Shanghai Datong Hi-tech Material Co., Ltd, Guangzhou B&G Building Materials Tech Co.,
Ltd, Akzo Nobel Car Refinishes (Jiaxing) Co., Ltd, Daikin Fluorochemicals (China) Co.,
Ltd, Nippon Paint (China) Co., Ltd, Suzhou Donglin Energy-saving Environment
Protection Building Material Co., Ltd, Changzhou Shuangou Flooring Co., Ltd, Shenzhen
Grace Shenli Alu. Co., Ltd, Jiangyin Zhongjiang Prepainted Steel Mfg Co. Ltd, Dong E
Blue Sky and Seven Color Building Materials Co., Ltd, Changzhou Lihua Metal Materials
Co., Ltd, Shanghai Jixiang Technology Development Group Co., Ltd and Ziwei Machinery
Equipment Co., Ltd, Shenyang.
The chief drafting staffs of this Standard include Jiang Quan, Liu Yi, Liu Shunli, Long
Guozhong, Xu Yongxiang, Wu Yuanguang, Li Shaoqiang, Guan Youjun, Gu Qinying, Feng
Tao, Zhou Gang, Zhou Dezhi, Tan Aimin, Han Hua, Wang Dong, Tang Jianrong, Zhang
Deming, Xu Minglin, Xiao Shuangqian, Zhang Shaohui, Zhu Rongping, Li Pan, Liu
Tingting, Liu Yujun, Zhao Chunzhi, Ma Liping and Zheng Xuying.
Roofing products from metal sheet with reflect
thermal coating
1 Scope
This Standard specifies the terms and definitions, classification and mark, materials,
requirements, test methods, inspection rules, marking, packaging, transportation and
storage of reflect thermal roofing products of metal sheet (“roofing board” for short).
This Standard applies to reflect thermal coating metal plate for building’s roofing.
2 Normative References
The articles contained in the following documents have become part of this Standard
when they are quoted herein. For the dated documents so quoted, all the modifications
(including all corrections) or revisions made thereafter shall be applicable to this Standard.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 1740 Determination of resistance to heat and humidity of paint films
GB/T 1766 Paints and varnishes - Rating schemes of degradation of coats
GB/T 3880.2-2006 Wrought aluminum and aluminum alloy plate sheets and strips for
general engineering - part 2. mechanical properties
GB/T 4956 Non-magnetic coatings on magnetic substrates -- Measurement of coating
thickness -- Magnetic method
GB/T 4957 Non-conductive coatings on non-magnetic basis metals—Measurement of
coating thickness—Eddy current
GB/T 5698-2001 Glossary of color terms
GB/T 6388 Transport package shipping mark
GB/T 9754 Paints and varnishes—Determination of specular gloss of non-metallic paint
films at 20°, 60° and 85°
b) When there is significant change in structure, material or process, which might affect
the performance of the product;
c) When resuming production after more than six months;
d) When the regular production runs for 2 years;
e) When the out-of-factory inspection results are significantly different from those of last
type inspection;
f) When quality supervision agency requires type inspection.
7.4 Batch grouping and sampling rules
7.4.1 Batch grouping
Out-of-factory inspection shall be based on the batch of continuously manufactured
products with the same specification, variety and color.
The samples for type test shall be taken from the products with the same type,
specifications and color passing out-of-factory inspection. The roller-coating products
shall be taken from a batch of 6,000m2. The spray-coating products shall be taken from a
batch of 3,000m2. When the amount [i.e. less than 6,000m2 / 3,000m2] is insufficient, it
shall be considered as an independent batch.
7.4.2 Sampling
7.4.2.1 Out-of-factory inspection
Appearance quality inspection may be continuously carried out on the production line, and
dimension and deviation shall be tested on each product. For the remaining, no less than
2m2 of the products shall be randomly selected from the same test batch and randomly
cut, based on the dimension and quantity required by the respective items.
7.4.2.2 Type inspection
TAKE randomly at least 2m2 sample from the same test batch for inspection of
appearance quality, size deviation, coating thickness and glossiness deviation. And
randomly CUT according to size and number required by the respective items.
7.5 Determining rules
If all inspection results conform to the requirements of the standard, this batch of products
is deemed as qualified products. If there is any non-conformity, double-quantity samples
3—— Thermoelectric couple
4—— Xenon lamp;
5—— Wind speed sensor
6—— Axial fan (with wind-guide fairing);
7—— Temperature sensor
Figure B.1 Thermal Insulation Temperature Difference Experimental Setup
Schematic Diagram
B.6 Test steps
a) ADJUST the lab environment to meet the requirements of B.3;
b) CONNECT the thermoelectric couple and heat flow meter at the back of standard
board, then INSTALL them at the test port above the metering tank and SEAL it.
c) SWITCH-ON xenon lamp, ADJUST the radiation intensity of surface of test piece to
800W/m2±20W/m2;
d) TURN-ON the axial fan and ADJUST the wind speed to 1.0m/s - 2.0m/s;
e) When the air temperature inside the metering tank reaches 23ºC, START to record
the time, and 1h later RECORD temperature T0 of inner surface of heat source of
standard board;
f) REPLACE the standard board with test piece, REPEAT the above steps to obtain the
temperature Ts of inner surface of the heat source.
B.7 Data processing
CALCULATE and OBTAIN the thermal insulation temperature difference of the sample
coating, according to formula (B.1). Each group of samples shall be tested for three times,
and the range of the results shall not exceed 2ºC. TAKE the average value of three tests
as the test result.
Where.
△T—— Thermal insulation temperature difference, ºC;
Ts—— The inner surface temperature of the heat source of the test piece, ºC;
T0—— The inner surface temperature of the heat source of the standard plate, ºC.
References and Original Chinese Documents
[1] JG/T 402-2013 Roofing products from metal sheet with reflect thermal coating.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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