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JG/T 234-2008 (JGT 234-2008)

Chinese Standard: 'JG/T 234-2008'
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Standard ID JG/T 234-2008 (JG/T234-2008)
Description (Translated English) Porcelain enameling steel panels for building
Sector / Industry Building & Construction Industry Standard (Recommended)
Classification of Chinese Standard H46
Classification of International Standard 77.140.99
Word Count Estimation 22,280
Date of Issue 2008-06-03
Date of Implementation 2008-11-01
Drafting Organization Kelvin Industrial Co., Ltd., Zhejiang
Administrative Organization Ministry of Housing and Urban-Rural Development, building products and components and parts Product Standardization Technical Committee
Regulation (derived from) Bulletin of the Ministry of Housing and Urban No. 37
Summary This standard specifies the architectural decorative enamelled steel terminology and definitions, classification and marking, materials, requirements, test methods, inspection rules and signs, packaging, transportation, storage and so on. This standard applies to construction inside and outside decorative enamelled steel.

JG/T 234-2008
Porcelain enameling steel panels for building
ISSUED ON. JUNE 03, 2008
Issued by. 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 ... 7 
5 Material... 11 
6 Requirements ... 12 
7 Test Methods ... 16 
8 Inspection rules ... 25 
9 Mark, Packing, Transportation and Storage ... 29 
Reference ... 30 
This Standard was proposed by Standard-Quota Institute of Ministry of Housing and
Urban-Rural Development.
This Standard shall be under the jurisdiction of Building Product and Part Standardization
Technical Committee of Ministry of Housing and Urban-Rural Development.
The responsible drafting organizations of this Standard. Zhejiang Kaier Industry Co., Ltd.
AND Shenzhen Xinshan Curtain Wall Technology Consulting Co., Ltd.
The participating drafting organizations of this Standard. Guangzhou Meibiao Yifeng
Enamel Co., Ltd., Baolichang Metal Products (Shenzhen) Co., Ltd., Foshan Weiyi Metal
Products Co., Ltd., Shenzhen Keyuan Building Group Co., Ltd., National Testing Center
For Building Materials, Guangdong Province Academy of Building Science, Building
Curtain-Wall, Door-Window Quality-Inspection Department of National Building
Engineering Quality, Supervision and Test Center, Institute of Vitreous Enamel of
Donghua University, East China Architectural Design & Research Institute Co. Ltd., AND
Hangzhou Zhijiang Silicone Chemicals Co. Ltd.
Main drafters of this Standard. Du Jiyu, Xing Hanxue, Dou Tiebo, Li Zhiqiang, Wang
Jiwen, Zhang Litao, Gu Jinfang, Li Xiuqing, Jiang Quan, Jiang Weizhong, Jiang Ren,
Dang Jie, Tan Shangfei and Liu Ming.
This Standard was issued for first-time.
Porcelain Enameling Steel Panels for Building
1 Scope
This Standard specifies the terms and definitions, classification and mark, material,
requirements, test method, inspection rules and mark, packing, transportation and
storage of porcelain enameling steel panels for building.
This Standard is applicable to porcelain enameling steel panels for interior and exterior
decoration of building.
2 Normative references
The articles contained in the following documents have become part of this document
when they are quoted herein. For the dated documents so quoted, all subsequent
modifications (including all corrections) or revisions made thereafter do not apply to this
Standard. However, the parties who reach an agreement according to this Standard are
encouraged to study whether the latest versions of these documents can be used. For
the undated documents so quoted, the latest versions (including all modification sheets)
apply to this document.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T2518 Continuously hot-dip zinc-coated steel sheet and strip
GB/T 3880 Aluminium and aluminium alloy rolled sheet
GB 6566 Limits of radionuclides in building materials
GB 8624-2006 Classification for burning behavior of building materials and products
GB/T 9174 General specification for transport packages of general cargo
GB/T 9978-1999 Fire-resistance tests - Elements of building construction
GB/T 9989-2005 Vitreous and porcelain enamels - Determination of resistance to citric
acid at room temperature
GB/T 12467.2-1998 Quality requirements for welding - Fusion welding of metallic
materials - Part 2. Comprehensive quality requirements
GB/T 13790 Cold rolled sheets and strips for civil enameling
GB/T 15227-2007 Test method of air permeability, watertightness, wind load resistance
performance for curtain walls
JC/T 564 Fiber reinforced calcium silicate sheet
JC/T 884 Building sealants for coloured coat steel plates
QB/T 1855-1993 Enamelled ware in non-contact with food
YB/T5131 Single hot-dip zinc-coated carbon steel sheets
3 Terms and definitions
For the purpose of this Standard, the following terms and definitions are applicable to this
Porcelain enameling steel panel
The combination panel that the inorganic glass material is fused onto steel panel and
forms firm combination with steel panel.
Composite porcelain enameling steel panel
The porcelain enameling steel panel of which the backside is adhered with back-lining
material or has interlayer.
Dry process enameling
The enameling method that the dry porcelain glaze powder is coated onto the base steel
panel through high-voltage static electricity.
Wet process enameling
The enameling method that the porcelain glaze powder that is floated in water (medium)
is coated onto base steel panel.
Square panel
The porcelain enameling steel panel of which the front-face is plane and the shape is
Circular panel
The porcelain enameling steel panel of which the front-face is cylindrical surface.
Orange-shaped irregular wrinkle on porcelain surface.
[GB 7410-1987, Definition 6.2.24]
Sunken or convex points of porcelain stack on porcelain surface.
Blister, pinhole, black dot, pit or spongy blackspot on porcelain surface due to excessive
boiling of the ground coating-layer in enameling process.
[GB 7410-1987, Definition 6.2.12]
Blue enamel
Black shadow of hiding ground porcelain coat due to too thin porcelain coat or snag.
[GB 7410-1987, Definition 6.2.28]
Concave pit of steel panel body due to collision and extrusion in processing.
Smooth uneven wrinkle or wavy trace on porcelain coat surface.
Uneven color
Uneven color on porcelain surface or local color change.
Lack of bisque
Powder porcelain coat is damaged before enameling, so as to result in the defect that the
porcelain coating is visible after enameling.
4 Classification and mark
5.2.4 When the back-lining needs to be covered, the overlay material should be
aluminum sheet or galvanized steel panel with a thickness not below 0.5mm. The
aluminum overlay shall conform to requirements of GB/T 3880. A single heat galvanized
steel panel shall conform to requirements of YB/T 5131. Continuous heat galvanized
steel panel shall conform to requirements of GB/T 2518.
5.3 Adhesive and sealing material
5.3.1 The back-lining and back-lining overlay of the combination panel should be bonded
by combustion heat value adhesive, and shall conform to requirements of fireproof
performance in 6.4 of this Standard.
5.3.2 The back-lining overlay of the combination panel should have edge sealing
treatment through neutral sealing adhesive conforming to requirements of JC/T 884. For
indoor porcelain enameling steel panel, the sealing adhesive material shall be nontoxic
difficult-flammable sealing adhesive; the combustion performance shall be Level B as
regulated in GB 8624-2006.
5.4 Fixed pendant
5.4.1 Fixed pendant shall be manufactured of cold-roll steel panel (the same material as
that of base steel panel) of which the thickness is not below 2.0mm, and have porcelain
enameling treatment together with base steel panel after being welded with the base
5.4.2 If necessary, it can be made of stainless steel panel of which the thickness is not
below 2.0mm. The fixed pendant is connected with the porcelain enameling steel panel
through bolts or stainless steel core-pulling rivets. The base steel panel shall have holes
for connection bolts or rivets before porcelain enameling.
6 Requirements
6.1 Dimensional deviation
6.1.1 The allowable dimensional deviation of square panel shall conform to regulations in
Table 3.
Table 3 The allowable dimensional deviation of square panel Unit. mm
Item Size range Allowable deviation
≤1 000 ± 2.0
>1 000 ± 3.0
≤1 000 ± 2.0
>1 000 ± 3.0
Folding height
≤50 + 1.0, 0 ......
Related standard: JGJ/T 234-2011    JG/T 363-2012
Related PDF sample: GB/T 708-2019    GB/T 709-2019