Performance comparison of polyurethane sandwich panel, rock wool sandwich panel, and glass fiber wool sandwich panel

1. Thermal conductivity: Based on a thermal conductivity coefficient of 0.022 for polyurethane, 0.058 for glass wool, and 0.046 for rock wool, 

from a spatial perspective, to achieve the same insulation effect, polyurethane sandwich panels can save 56% of wall space.

2. Flame retardant performance: Rock wool and glass wool sandwich panels can achieve A-level fire resistance, 

while polyurethane sandwich panels can achieve B1 level fire resistance. 

The fire resistance of rock wool and glass fiber wool sandwich panels is better than that of polyurethane sandwich panels.

3. Hygienic performance: Polyurethane foaming is uniform and there is no possibility of dirt or scale inside the board. 

Rock wool and glass fiber cotton are flocculent soft materials that are prone to bacterial parasitism, 

and are less commonly used in the food and pharmaceutical industries.

4. Water absorption performance: Polyurethane does not absorb water and can be directly immersed in water. 

Rock wool and glass fiber cotton absorb water severely, and their insulation performance decreases after absorbing water, 

which can easily lead to bacterial growth. Prolonged storage can cause pulverization, 

and aged glass wool and rock wool are very harmful to the human body.

5. Compressive strength: Polyurethane composite board is formed by one-time foaming, with high strength. 

Taking 50mm thick polyurethane composite board as an example, in areas with wind loads less than 1.7 kn/㎡, 

the distance between wall purlins can reach 3 meters. This can greatly reduce the amount of steel used and lower costs.

6. Surface quality: the polyurethane sandwich panel is produced by the factory's continuous line, and is formed by foaming at one time.

 The bonding strength between foam and steel plate is large, which can keep the size stable. Rock wool and glass fiber wool sandwich panels, 

for later bonding and composite, are prone to delamination, causing hollowing and uneven surface.

7. Panel thickness requirements: Rock wool and glass wool sandwich panels require a very thick panel, 

with a minimum thickness of 0.7-0.8mm to be flattened, while polyurethane sandwich panels are formed in one foaming process, 

with high surface flatness. Only 0.5-0.6mm panels can achieve a mirror finish.

8. Construction simplicity: Rock wool and glass wool have a much heavier density than polyurethane, making lifting during construction more difficult. 

During the construction process, many situations require cutting. 

Under cutting vibration, the glass fiber sponge sandwiched at the cutting position is prone to delamination and detachment from the metal panel, 

causing the sponge to fall off, thereby increasing the difficulty of construction.