August 3, 2007 - Trico-USA Inc., one of the leading shade structure manufacturers, have designed various forms and shapes of TricoShade structures using UV stabilized polyethylene for a wide number of target markets. In this article we will examine a few of the differences between canvas, polyethylene and PVC, and what makes these materials like chalk and cheese, and how they behave in the elements. Some of the differences between polyethylene and canvas is in its chemical composition.