Product Description
Contra Vision® Cast Black Dual Color Film for Backlit Channel Letters
BBCRW20A is a specialty 4.72-mil cast PVC perforated film engineered for a single purpose: giving built-up backlit channel letters and sign cabinets two completely different looks from one film. Applied to the outside face of the translucent acrylic panel, the sign reads as a clean black face during the day and when the lights are off — then transforms to the color of the underlying translucent acrylic at night, when the lighting comes on.
Designed and manufactured by Contra Vision®, the original inventor of perforated one-way vision film, BBCRW20A delivers cast-film conformability, a 20% open area for vibrant nighttime color, and up to 7 years of warranted outdoor durability in North America (Zone 1) on static applications.
Key Features
How the Dual-Color Effect Works
BBCRW20A is applied to the outside (first surface) of a backlit sign's translucent acrylic face panel. The film is 80% solid black PVC with 0.06" perforations covering 20% of the surface area.
- During the day (or with lights off): ambient light reflects off the black film. The perforations are too small to perceive at viewing distance, and the sign reads as a clean, solid black face.
- At night (lights on): the internal lamps illuminate the translucent acrylic from behind. Light passes through the 20% open area of the film, and the acrylic's color becomes the dominant visible element — transforming the same sign into a glowing colored channel letter.
This is the same optical principle behind one-way vision window film, applied in reverse: instead of hiding what's behind the film during the day, BBCRW20A reveals what's behind it only when the backlight is on.
Applications
- Built-up backlit channel letters — the primary application Contra Vision designed this product for
- Lightbox cabinet signs with translucent acrylic faces where a daytime stealth/blackout look is desired
- Retail and commercial signage requiring a clean, modern matte-black daytime appearance
- Architectural signage on storefronts, lobbies, and exterior building identification
- Custom dual-look graphics — print full color on the film for printed-day-look / illuminated-color-night-look effects
Technical Specifications
| Product Code | BBCRW20A |
|---|---|
| Range | Contra Vision® Cast Black Dual Color |
| Face Film | Cast PVC, black |
| Film Thickness | 4.72 mils |
| Transparency / Open Area | 20% |
| Hole Diameter | 0.06 in (~1.5 mm) |
| Adhesive | Clear solvent acrylic, pressure-sensitive, semi-permanent |
| Adhesive Weight | 0.74 oz/yd² ± 0.15 oz/yd² |
| Liner | Replacement Liner — unperforated white paper, PE & silicone coated (top side) |
| Liner Weight | 2.95 oz/yd² ± 0.29 oz/yd² |
| Peel Adhesion (20 min) | 32.87 oz/in — printed film on glass, typical value |
| Peel Adhesion (24 hr) | 36.52 oz/in — printed film on glass, typical value |
| Shrinkage | ≤ 0.6% (x & y direction, FTM14) |
| Service Temperature | -13°F to 149°F |
| Minimum Application Temperature | 50°F |
| Shelf Life | 3 years at 71.6°F, 50–55% RH (unopened, stored flat) |
| Durability (Zone 1 — North America) | Up to 7 years on static vertical applications |
| Removability | Not intended as a removable product |
| Print Compatibility | Solvent, eco-solvent, latex, resin inkjet; screen printing |
| UV Inkjet Printing | Not recommended with Replacement Liner — specify Universal Liner for UV applications |
| Fire Rating | ASTM E84 certified (see Contra Vision technical hub) |
| Environmental | REACH compliant, phthalate-free |
Optical & Solar Performance
Measured on 1/8" glass with the film installed (vs. uncovered glass):
| Visible Light Transmission | 18% (vs. 90% on bare 1/8" glass) |
|---|---|
| Visible Light Reflection — Exterior | 66% |
| Visible Light Reflection — Interior | 12% |
| UV Transmission | 8% (80% UV reduction vs. bare glass) |
| Solar Energy Transmission | 17% |
| Solar Energy Absorption | 18% total |
| Glare Reduction | 80% |
| G Value | 0.172 |
| Shading Coefficient (SC) | 0.2 |
Printing Recommendations
BBCRW20A is fully compatible with solvent, eco-solvent, latex, and resin inkjet printing, as well as screen printing. For UV-cured inkjet, however, Contra Vision recommends specifying the Universal Liner version instead — the Replacement Liner construction can produce ink bridging across the perforated holes in dark areas of the print after liner removal.
- Ink must be fully cured and dry — including inside the perforated holes — before lamination or handling, to avoid contamination.
- Test print on a small sample before running full production with any new ink/printer combination.
- For best dual-color effect, keep print densities moderate in areas where the underlying acrylic color should show through at night.
Warranted Durability by Region
Durability is stated for unprinted, untreated film correctly applied to an inert vertical substrate. Printed graphics, lamination, and substrate prep can affect actual life.
- Zone 1 — 7 years: United States, Canada, Patagonia
- Zone 2 — 6 years: Argentina, Chile, Paraguay, Uruguay
- Zone 3 — 5 years: Bolivia, Brazil, Caribbean Islands, Central America, Mexico, Peru
Refer to the Contra Vision® Cast Dual Color Warranty Bulletin for full terms.
Frequently Asked Questions
What does "dual color" actually mean in practice?
It's the combination of two visual states from a single film: a solid black look during the day or when your sign is off, and the color of your translucent acrylic when the sign is backlit. So a yellow translucent acrylic letter overlaid with BBCRW20A reads black by day and yellow at night.
Which side of the channel letter does this go on?
BBCRW20A is applied to the outside (first surface) of the translucent acrylic face panel. The black film faces the public; the perforations carry the acrylic's color out at night.
Do the perforations show up close?
The hole diameter is 0.06 inches. From typical sign-reading distances (10+ feet), the film reads as solid black during the day. At very close inspection (under a few feet) the perforation pattern can be visible — similar to standard one-way vision window films.
Can I use UV-cure printers on this film?
Not with the Replacement Liner construction. UV inks can bridge across the perforations during printing and cause issues after liner removal. For UV inkjet, specify the Universal Liner version of this Contra Vision product line — contact KG Supplies and we'll source it for you.
How long will it last outdoors?
Up to 7 years in Zone 1 (United States and Canada) on static, vertical applications when correctly installed on an inert substrate. Printed graphics may have shorter warranted life depending on ink type — consult your ink manufacturer.
Is it removable?
No. BBCRW20A uses a semi-permanent acrylic adhesive and is not designed for clean removal. It's intended for long-term signage installations.
What's the minimum application temperature?
50°F. Don't apply below this threshold; the adhesive won't tack properly and you'll risk lift, edge failure, or bubbling. Allow 24 hours before washing the sign face.
Can it be applied to curved channel letter returns?
BBCRW20A is engineered for flat or gently curved surfaces only. It's intended for the flat translucent acrylic face panel of channel letters — not for wrapping returns. Use a compatible cast vinyl for return color, or fabricate returns from pre-finished aluminum coil.
About Contra Vision®
Contra Vision® is the original inventor of perforated one-way vision and dual-color window film, with over 30 years of innovation in privacy, architectural, and signage film technology. KG Supplies is an authorized Contra Vision distributor serving Arizona, Nevada, New Mexico, Colorado, and the broader Southwest with overnight delivery — and shipping nationwide via UPS.
Datasheet reference: BBCRW20A v1.1, October 2025. Information provided as a guide only; purchasers should independently verify suitability for their specific intended use. KG Supplies can provide additional technical guidance — call us at the number on our contact page.
