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DUOWEI Union Group Co., LTD. as a group corporation enjoying a competitive edge in the field
of steel structure and new building boards, was founded in 1983 with the registered capital being
126 million yuan, whose headquarters is located in Zhongguancun Fengtai Science Park, Beijing.
DUOWEI has grown as an enterprise with such honors as Famous Trademark of China, the Best
General Service Provider of Steel Structure Building System of China, the Leader of China's New
Energy-efficient Construction Board Industry, China’s Top 30 Construction Enterprises in the Steel Structure Industry, the High and New Technology
Enterprises in Beijing, the High and New Technology Enterprises in Zhongguancun. DUOWEI is
the main co-compiler of 16 national standards and industrial standards, and possesses the National
Qualification of Class A in Architectural General Design, the Qualification of Grade A in Steel
Structure Engineering Special Design, the Special-grade Qualification of Steel Structure Manufacturing, the Qualification of Class A in Professional
Contracting for Steel Structure Projects and the certificate of ISO 9001: 2008 International Quality
Management System Certification.




Feature of Cold Room
(1).Temperature range :-40°C~+20°C(-40°F~+68°F)are all available
(2).Size:Customization
(3)Functions:fresh-keeping,freezing,quick-freezing,fire-proof,explosion-proof,air-conditioning are all available
(4).Fully automatic control system.
Detailed Product Description
1. Heat and sound insulation. Temperature suitable for PU ranges from -200 centigrade to
150 centigrade.
2. Good chemical resistance, waterproof, anti-corrosion, insect-free etc.
3. Advanced Tech: Automatic rolling machines make the whole process of manufacture
effective.
4. Energy conservation, environmental protection, economical, heat insulting, good structure
, easy-doing construction
5. Light weight enough to reduce building expense.
6. Time can be saved on a building project due to the simple installation
PU Sandwich panel (Polyurethane sandwiched panel )is composed of 2 layers of weather-proof colored steel sheets and jetted the hard forms of polyurethane between 2 layers which feature fireproof materials. It is
suitable for the various roofs and walls referring to the large-size factory buildings, storages, exhibition halls, gymnasiums, freezing stores, purifications workshops, etc, which features
temp-keeping, heat insulation, weight-bearing, weatherproof with the rich colorfulness and good appearance.
PU insulation sandwich panel
PU board adopts quality raw material from BASF which guarantees the qualtiy of foamed boards.
The board is formed in one time by pressure injection machine with color steel sheet or stainless steel sheet on both sides.
The polyurethane inside is spread evenly which guarantees a high efficiency in thermal insulation and lowers cold
consumption, thus, the customers operation cost is
PU Sandwich Panel(Width 1000mm,100mm)
1, the quality of light weight per square meter of less than 24kg, can reduce the cost of the structure.
2, quick installation of light weight, splicing, installation and can be arbitrarily cutting characteristics, determine its
installation is simple, can improve efficiency, save the time.
3, fire, Caigang composite plate core surface materials and insulation materials for the non-fuel or burning material, can meet the requirements for fire protection.
4, refractory, with a special coating color steel plate and the new 10-15 years, after every ten years spraying anti-corrosion coating, sheet life over 35 years
5, beautiful, pressure plate clear lines of dozens of kinds of colors, can be matched with any style of the building takes
6, insulation insulation material commonly used are: rock wool glass fiber, cotton, polystyrene, polyurethane, low thermal
conductivity, good thermal insulation effect.
7, environmental noise prevention, composite board insulation strength up to 40-50 dB, is very effective sound insulation materials.
8, strong plasticity sheet steel can be cut, enough to meet the special design needs.
9, high strength with high strength steel plate as a substrate, the tensile strength of 5600 ( kg / cm2 ), plus on the most
advanced design and roll forming, and has excellent structural properties
Applications:
1) sandwich panel used in large industrial plants, warehouses, supermarkets, hospitals, stadiums, cold storage, activities
room, buildings plus layer, clean workshop and heat insulation fire place.
2) sandwich plate appearance, bright color, good overall effect, it sets the bearing, thermal insulation, fireproof, waterproof
in one, and no two decoration, is a widely used, especially in the construction site of the temporary facilities such as office,
warehouse, walls, but also embodies the modern construction site civilization construction,
3) in the fast installation and put into use, the assembly and disassembly, material turnover multiplexing index, have
obvious advantages, greatly reducing the construction site temporary facilities, will be indispensable new lightweight
construction materials
This kind of pu sandwich panel has characters as follows:
Material:
1. steel strip:up/bottom 0.3- 1.2mm colourcoated steel panel/zinc plate,hot galvanized plate/stainless steel plate
2. core material: density of PU:30-80kg/m3
Specification:
1.T he applicable width of interface;950mm,1150mm
2. thichness:40mm-250mm
3. no length limit.
product perfomance: light and durable,easy to install, large usage
Fire-resistance rating:B
Usage: This kind of sandwich panel can be used in steel structure workshop,easy building and air clean room as walls ,
ceilings. Especially for cold storage




Packing :
In general, for steel structure , we use the steel frame packing to keep goods
not to be broken . For sandwich panel and color steel sheet, we use the
plastic packing .
If the clients need special packing will according to their requirements.



the DUOWEI Union Group has been making successes in serving PetroChina, Aerospace China,
China Nuclear Power, China FAW, China Guodian, China CNR, China Coal and other super large
enterprises, and participating in national key projects, such as Hexie locomotive, National Grand
Rocket, National Large Aircraft, Aerospace Coal Gasification, etc., and the group will continuously
provide customers with innovative products and high-quality engineering services.
In the oversea project, such as Mongolia, Russia, Africa, Iraq, Spain, Brazil, Ye men, Sri Lanka,
Chile, Ghana,Algeria,Sudan,Italy Bracket,Kazakhstan, Senegal,Ukraine,Columbia,Namibia,Niger,
Tajikistan,Thailand,Burma ,Australia,Sweden and so on



New products from manufacturers at wholesale prices