Polyethylene plastic has many properties that make it useful as a covering for greenhouses. Its low cost, large sheet size, ease of attachment and good light transmission are properties that have helped to expand its use so that today it is the most common glazing. UV Plastic specification: 1UV Plastic 6% 300 (150) cm x 100 m x 20 micron 2. UV Plastic 14% 300 (150) cm x 100 m x 20 micron