Perforated plastic sheet such as perforated PP sheet,perforated PVC sheet and perforated PE sheet is a material whose size can be affected easily. In summer, because of high temp.the size of perforated plastic sheet will grow but when the temp. decrease, the size of the plastic sheet will shrink.In winter, the temp. is very low, the perforated plastic sheet made in this season will grow when the weather becomes warmer and warmer.
Therefore, if you have strict requirement on the size, you have to take the temp. into consideration when ordering the plastic sheet.
So our suggestion is to tell us the temp. that your working surroundings. or you can tell us the usgae of the perforated plastic sheet, then we can give you the suggestion.