Blackout Fabric
A densely woven or coated fabric designed to block light completely, commonly used for curtains and window treatments.
Blackout fabric is specially engineered to block 100% of light from passing through, creating complete darkness in interior spaces. This light-blocking capability is achieved through dense weaving constructions, specialized coatings, or multi-layer fabric structures.
3-Pass Acrylic Foam Blackout Construction
Cross-section: Face fabric + White primer pass + Black carbon light barrier + White protective backing blocks 100% of incident light.
3-Pass coated blackout vs 3-layer woven blackout (dimout)
When sourcing window textiles for hospitality or residential lines, buyers choose between coated blackout and inherently woven dimout constructions:
| Sourcing Parameter | 3-Pass Coated Blackout Fabric | 3-Layer Woven Blackout (Dimout) |
|---|---|---|
| Light Blockage Level | 100% Total Blackout (zero light transmission) | 95% to 99% Dim-out (soft ambient glow) |
| Layer Architecture | Base cloth + White pass + Black pass + White pass | Face warp/weft + Black high-density core yarn + Back face |
| Drape & Hand Feel | Firmer, structured body; heavier curtain hang | Soft, fluid drape; natural fabric flow |
| Thermal Insulation | Superior (-value enhanced by closed cellular foam) | Moderate thermal retention |
| Acoustic Dampening | Effective sound absorption (reduces echo) | Minor ambient sound dampening |
| Laundering Method | Dry clean or gentle sponge wipe; no high-heat tumble | Machine washable (30°C–40°C); easy commercial laundry |
| Seam Light Leakage | Needle penetrations create tiny pinholes unless taped | Weave yarns compress around needle; zero pinholing |
| Best Applications | Luxury hotel suites, bedrooms, home cinema rooms | Living rooms, conference halls, educational facilities |
How 3-pass acrylic foam blackout is manufactured
The 3-pass coating sequence applies three distinct polymer formulations in a single continuous stenter line:
- Pass 1 (White Primer Foam): A formulated acrylic foam coats the reverse of the decorative face fabric, filling microscopic yarn interstices to create an anchor layer without bleeding through to the face.
- Pass 2 (Black Carbon Core): An opaque acrylic layer heavily compounded with carbon black pigment is knife-coated over the primer. This dense, non-reflective layer absorbs 100% of incident photons.
- Pass 3 (White Protective Backing): A final white or off-white acrylic layer seals the carbon core, ensuring a uniform, aesthetic appearance visible from outside the window while protecting the blackout core against UV degradation.
Wide-width production for seamless hotel installations
Standard residential fabrics (140–150 cm) require multiple vertical joins when tailored into expansive hotel window curtains, introducing seams that compromise aesthetic symmetry and leak light.
Weaverine weaves drapery base cloths on specialized wide-width waterjet looms up to 280 cm to 315 cm (110–124 inches). Tailoring from wide rolls enables seamless horizontal cuts for floor-to-ceiling curtains with zero vertical joins.
What to specify on the mill purchase order
- Light Control Standard: Specify "100% total blackout (zero lux transmission under ASTM F1812)" or "98% dim-out".
- Flame Retardancy (FR): For hospitality and commercial projects, specify required national standards (e.g. NFPA 701, BS 5867 Type B, or DIN 4102 B1).
- Finished Weight & Width: State required weight (e.g. 240–280 GSM) and cuttable width (e.g. 280 cm or 300 cm).
- Coating Formulation: State whether 1-pass, 2-pass, or 3-pass acrylic foam is required, and confirm washing instructions.
Spec tools
Common questions
What is the difference between blackout and dimout fabric?
- Blackout fabric blocks 100% of incident light via a multi-pass acrylic foam coating or dense sandwich weave. Dimout fabric blocks 95% to 99% of light through dense black core yarn weaving without coatings, preserving a softer drape.
How does 3-pass blackout coating work?
- Pass 1 applies a white acrylic primer foam sealing base cloth pores; Pass 2 applies a black carbon-pigmented barrier layer that absorbs 100% of light; Pass 3 applies a protective white outer layer providing clean window-facing appearance.
Does blackout fabric provide thermal insulation and noise reduction?
- Yes, the multi-pass acrylic foam backing forms an airtight cellular barrier that reduces window thermal transfer by up to 25–30% and dampens ambient room echo and street noise reverberation.
What widths are available for hotel blackout drapery?
- Commercial mills weave blackout drapery bases on wide-width waterjet looms from 280 cm to 315 cm (110–124 inches), enabling seamless floor-to-ceiling curtain panels without vertical seams.
Related Terms
Sourcing blackout fabric or a polyester equivalent? We quote mill-direct programs from 5,000 m per specification.
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