Black + White Poly, 10 ft x 100 ft, 5.5 mil Roll, Heavy Gauge

Reflective Poly Film in the Heavier 5.5 Mil Gauge

The difference between the two gauges is whether the film survives the room. Thicker film takes staples without tearing out and shrugs off a passing cart. This roll runs 10 ft wide and 100 ft long. The white face is rated over 90% reflective by Hydrofarm. That figure matters most on side walls, where a lot of usable light otherwise disappears. The black face blocks light through the sheet entirely. Both faces are waterproof, so the film doubles as a moisture barrier on a wall you would rather not replace. It ships as a folded roll about 3 ft across. Unfolding it to full width takes two people and a clear floor. Commercial rooms and permanent installs are where this weight belongs.

Hanging 5.5 Mil Black and White Film Without Regret

Most failures happen at the fastener, not in the middle of a panel. Staples pull through thin film when a sheet sags, so hang from a top batten and let the weight hang straight. A strip of wood or webbing across the staple line spreads the load. Tape every seam and overlap panels in the direction light would travel. On ceilings, run the sheet in one piece if the span allows. Leave a gap behind lights so hot air is not trapped against plastic. Wipe the white face between cycles, because dust costs reflectivity faster than growers expect. If you are lining a room for blackout, check it at midday with the lights off. Your eyes will find leaks a meter never will.

Key Features

• Thickness: 5.5 mil polyethylene, the heavier of the two gauges
• Size: 10 ft wide by 100 ft long on a folded roll
• White Side: rated above 90% reflective by Hydrofarm
• Black Side: blocks light through the sheet completely
• Holds Fasteners: thicker film resists tear-out at staples and clips
• Waterproof: works as a moisture barrier as well as a liner
• Cut to Fit: trims with a blade and takes staples, tape or clips

Technical Specifications