Most of the inexpensive modern tarps we see today are made from woven polyethylene; this material is used so widely that many refer to it as polytarp. Some tarps are still made of canvas or vinyl and are used mostly for specialized applications. Formerly, canvas and canvas-type tarps were heavy and bulky. To make them waterproof, they were treated with tar or paint. They also had a tendency to pick up moisture, and as one might expect, they had low to no flexibility in freezing temperatures. They would become even more bulky and cumbersome with age because canvas is a natural fiber material and prone to moisture retention, mildew and decomposition.
In the early sixties, fabric tarps were coated with nylon, polyester or polyethylene. This was a great advancement in tarp design. Polymers were just starting to take hold in industrial and consumer markets. Polymers made products much more versatile and durable, as well as spawning a plethora of new lightweight and inexpensive items. For tarp design and construction, woven polyethylene eventually became the dominant material.
Advances in polymer science and engineering have influenced great technical strides in the...