Patent ID: 8568860

Claim:
A multiwall sheet, comprising: main layers and transverse walls, wherein the main layers comprise outerwalls; a total thickness of greater than or equal to 45 mm; and/or a weight of greater than or equal to 4.5 kg/m 2 ; and/or greater than or equal to 8 cells located in a straight line between the outerwalls, wherein the line is perpendicular to the outerwalls and a U-value of less than or equal to 1.2 W/m 2 K; and greater than 75 wt % branched polycarbonate resin, based upon a total weight of the multiwall sheet; and wherein the total thickness of the multiwall sheet varies by less than or equal to 2% from an average total thickness, and wherein the average total thickness is determined over an area of 1,200 mm width by 4,200 mm long using at least 10 data points across the width, and/or adjacent main layers will vary by less than or equal to 20% from an average adjacent layer average thickness wherein the average adjacent layer thickness is determined over an area of the adjacent layers of 1,200 mm width by 4,200 mm long using at least 10 data points across the width.