Greenhouse Polythene Sheet - Polytunnel Clear Cover, Heavy duty, UV-4 Stabilised Polythene tunnel sheeting - Professional grade (200 Micron, 800gauge thickness, Various Sizes) (6m x 2m) : Amazon.co.uk: Garden
Pros and Cons of Polyethylene Plastic for Greenhouses - Greenhouse Info
Poly Sheet - Plant Protection Products - Garden Health
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Farm Plastic Supply - Clear Greenhouse Plastic Sheeting - 6 mil - (10' x 10') - 4 Year UV Resistant Polyethylene Greenhouse Film, Hoop House Green House Cover for Gardening, Farming, Agriculture - Walmart.com