Light Filtering vs Blackout Fabric -- What's the difference? Light blocking fabrics are available in two different grades, light filtering and blackout.
Light filtering fabrics will block much of the light coming into your room. The fabric used in light filtering shades can be decorative or it can be technical fabric, like screens. These fabrics allow some light to pass through the fabric but still blocks some of the light. Additionally, some light will pass around all four sides, including the top, of the shade when installed.
Blackout fabrics are perfect when there is a need for more darkness. Blackout fabric has multiple layers that may block 100% of the light. While the fabric blocks the light, some light may get in through light gaps on the top, side, and bottom of your shades. The side gaps allow the shade to raise and lower without rubbing the sides of the window frame. For enhanced light control, you can cover these side and bottom gaps with light blocking side channels and sill rails. Considering that QMotion shades already offer the smallest light gap in the industry at 1/2 of an inch, adding Side Channels and Sill Rails reduces that even further. For complete light blockage, your installation may require architectural changes to the windows to ensure that they are square and flat, and you should consider outside mounted shades for the greatest level of light control.
Composition: 100% Polyester / Acrylic - Foamed Backing PVC Free
Width: 94" and 118" (2138cm and 299.7cm)
Weight: 13.41 oz / yd² (454.67g / m²) ± 5%
Thickness: 0.026" (0.66mm) ± 5%
NFPA 701-99 TM#1, California U.S. Title 19
Openness Factor: Opaque