A polyethylene sheet is actually a plastic film or sheet made from one of the most commonly used plastics. Like all plastics, polyethylene is a petroleum product. It is a very strong plastic that can be found in items ranging from shopping bags to bulletproof vests.

A polyethylene sheet is more properly called polyethylene film when it is made with a thickness of about one-third millimeter to ten millimeters. These films are normally translucent. They can be made opaque with the use of additives.

Thin polyethylene sheets are sold in rolls and used in many commercial and industrial activities. It does not rot, and it is resistant to many chemicals. It can be reused many times. It is not damaged by extreme weather, which makes it a good choice for many kinds of outdoor applications.

Polyethylene sheet is used for many kinds of weatherproofing and can be a permanent weather barrier on exterior walls. It is used in construction and remodeling projects, especially as a vapor barrier. It’s commonly used to temporarily seal off rooms and to cover building materials. It is frequently used as a painter’s drop cloth. It can be used in curing concrete to retain moisture during the curing period. Some tarpaulins and tents are made from polyethylene sheet.

Polyethylene sheet also has agricultural uses. It is often used as a weed barrier in landscaping projects. It can provide walls and roofs for a temporary greenhouse.

Thick polyethylene sheet is rigid or semi-rigid. It has high tensile strength and smooth surfaces. It is normally white, but it can be produced in a variety of colors. It is quite resistant to abrasion and environmental stress cracks. Thick polyethylene sheet is sold in panels of standard sizes. Sometimes larger panels are molded with accordion folds to make them easier to transport. They are extensively used in the construction industry.

High density polyethylene sheet is used for cutting boards. It makes a strong, chemical-resistance worktop. This sheet is also frequently used for signs. Some high density sheeting is two inches (5.08 cm) thick.

Environmentalists have not been particularly fond of polyethylene sheet and film. Polyethylene takes centuries to decompose, so it is not considered a biodegradable material. It can be recycled, but generally it is discarded. The problem may soon be solved, however. In 2008, a Canadian student found that one type of bacteria can degrade about 40 percent of a set quantity polyethylene plastic bags, as measured by weight, within three months.