Sandwich panel surfaces are made of raw steel, galvanized steel and a mix of organic coatings. The material’s life span is long thanks mainly to the fact that organic coatings have excellent corrosion resistance.
Depending on corrosion type and degree, sandwich panels’ outside surface thickness may be 45 μm, the organic coating being 25 μm and the galvanized steel coating being 45 μm thick.
Depending on demand, thickness may increase up to 200 μm. High resistance to UV rays, heat, humidity and physical and chemical agents is usually required. Besides, the wide color range offered by coatings are an design advantage in building projects.
Coating materials are divided into three groups; liquid coating, film coating and powder coating. The top layer may be coated in different colors and have different quality levels. It may be used on galvanized steel sheets or aluminium. The coating type for the top layer is chosen according to place of application and desired characteristics.
Polyester: Adequate resistance to weather conditions, high flexibility and thermal equilibrium. The most commonly used type of paint. Can be used for different purposes both indoors and outdoors.
PVDF: High chemical corrosion resistance, high resistance to weather conditions and to synthetic oils. High resistance to chemical and UV rays. Highest color and gloss retention of all coating types. May be used as coating on roofs and walls of luxury buildings.
Plastisol: Can be molded into perfect shapes. Can be used in places subject to food safety regulations as it is moisture and abrasion resistant. It also shows great performance in cold and humid weather conditions.
PVC Film: Lamination technique used in its manufacture. Malleable and flexible. Can be used in places subject to food safety regulations as it is a hygienic and easy-to-clean material.
|HUMIDITY||AVERAGE THICKNESS||HEAT RESISTANCE|
|Polyester||2800 gms||500 h||1000 h||25||
|PVDF||3000 gms||500 h||1000 h||27||120°C|
|Plastisol||3500 gms||1000 h||1000 h||100-200||60°C|
|PVC Film||3500 gms||1000 h||1000 h||200||