Polyurethane Sandwich Panels

Polyurethane Insulated sandwich panels

PU insulated panel is a composite prefabricated building material. It is made up of a rigid core sandwiched between two metal sheets. The rigid core is made of polyurethane which is known for its excellent heat insulation properties. Polyurethane is the most widely used insulation material for cold-rooms and energy efficient buildings.

Comparison between polyurethane and other insulation materials.

Panels are made of two metal sheets which are roll formed to increase strength. The steel sheets are placed in moulds and injected with liquid polyurethane using a high pressure injection machine. The panels are heat cured in the moulds to form a rigid sandwich panel which has high strength and excellent insulation property. The material for sheet metal is galvanised steel which is pre painted and has layer of polythene on top. This gives the panel great insulation and is completely rust resistant properties.Polyurethane is well known for its insulation properties. The annual worldwide consumption of polyurethane for the use of insulation is approximately 662 Million Kilograms. Insulation properties are usually measured by R-Values. R- Value is a relationship between thickness of material and the transfer of heat per unit area. The greater the R value the better insulation properties. The following table compares the R-Values of various insulation materials:

Insulation Material	R-Value (greater the R value ,better insulation properties)
Polyurethane rigid panel (CFC/HCFC expanded)	R-7–R-8
Foil-faced polyisocyanurate rigid panel (pentane expanded ) initial	R-6.8
Moulded expanded polystyrene (EPS) high-density(Thermopore)	R-4.2
Moulded expanded polystyrene (EPS) low-density(Thermopore)	R-3.85
Open-cell polyurethane spray foam	R-3.6
Cardboard	R-3–R-4
Rock and slag wool loose-fill	R-2.5–R-3.7
Fiberglass loose-fill	R-2.5–R-3.7
Straw bale	R-1.45
Hardwood (most)	R-0.71
Brick	R-0.2
Glass	R-0.14

As seen in the table above polyurethane rigid panel has the highest R value thus having the best insulation properties.

Rigid polyurethane sandwich panel

Walk-in Cold rooms and controlled atmosphere rooms made of PU sandwich panels.

Panels are manufactured with different dimensions according to the required space and covered area. The manufactured panels are then assembled on relevant site. The assembly procedure is simple and quick. The panels can easily be dissembled for relocation or extension.

Polyurethane sandwich panels are the standard building material for cold rooms and controlled atmosphere application throughout the world. The panel’s high insulation properties can be used for low temperature applications in cold rooms. Pu sandwich panels can hold temperatures from -45 degree Celsius to + 80 degree Celsius. The panel can also sustain various air pressures and humidity.

Pu sandwich panel is optimum for hygienic conditions. The panel satisfies all HACCP and international standards for food processing and storage. This make PU sandwich panel rooms ideal choice for the storage of meat, fruits, vegetables, medicines and vaccines. The panel’s smooth surface finish prevents any bacterial growth and can be easily cleaned. The panels are completely waterproof and air tight which prevents any air leakages.

Aesthetically the panels give a very neat and clean appearance thus making it optimum choice for cold-room construction.

PU High rib sandwich panels for building roofs.

High Rib PU panels are extensively used in covering building roofs due to its high strength and excellent insulation properties. The panel can withstand harshest of the conditions including high winds, torrential rain, heavy snow and extreme temperature fluctuations. The PU panel’s insulation properties keeps heat out of the building in hot weather thus keeping the building cooler than outside temperature.

The panel’s high surface finish gives it a low friction rating which allows water or snow to slide off easily. It also prevents accumulation of debris. Panels are prefabricated and then assembled on site. The assembly procedure is simple and fast. The panel’s modular structure allows it to be disassembled for relocation or extension.