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Polycarbonate hollow sheet (also called twin-wall or multiwall) has an air gap inside, which like a honeycomb structure. 

So polycarbonate hollow sheet produced by Sinoceiling is lighter and insulates better because of the air pockets between layers. 

Polycarbonate solid sheet looks like glass—but it’s 200x stronger. so It’s one solid layer, giving it a crystal-clear finish and serious 

impact resistance.

Polycarbonate solid sheet tends to cost more and is heavier to install, which apply for Door and window awnings, Covered walkways or 

shelters and Privacy panels or windbreaks.But polycarbonate hollow sheet is best for Greenhouses and sunrooms, Pergola covers, Sheds 

and carports and Non-load-bearing awnings.