First, If the factory uses the recycle material, the sheet will have yellow surface. 
If the factory use all new raw material, when you see it under sunshine, 
the sheet without recycle material it should quite clear and bright.

          Second ,Cutting one piece of the sheet along the length side, and bending it for several times. 
You would find that the good quality sheet can bend more than 15 times, but the bad quality ones only can bend 2-3 times.

         Third ,Standing in front of the sheet, you can see the cross section. 
If the sheet’s wall thickness is uniformity and sheet stub is vertical. The sheet is good, otherwise, it is bad.

         Four ,The weight is another way to check the quality of the sheet. 
If the sheet doesn’t lumping weight, when you use your index finger pinch pressure the sheet, it will sink. 
In a way, this shows the factory give short weight.

        All above method only can test the basically quality. 
More qualification needs the specialized technology machine support,
If you have question for the quality of the sheet, please feel free to contact with us and welcome to our lab to test .
 

Important NOTE:

        1.The side with UV protection layer which covered with printing film must towards the sun.

        2. If there is anything about the important information (payment,account and so on) to be changed, 
we will confirm with you by phone(0086-13420298302) .If there is only email ,but no phone or fax,
please don't make any reaction .If the payment transfer to the changed account without our confirmation by phone or fax ,
we won't responsible for the loss caused by .

        Tips about how to distinguish good polycarbonate sheet