Product Description
The 4mm Corrugated Plastic Sign Blank – 18" x 24" is one of the most popular sizes in the sign industry, offering the perfect balance of durability, affordability, and ease of installation.
Made from fluted polypropylene, this sign blank is designed for indoor and outdoor use, resisting moisture, UV exposure, and everyday wear. The 24" flute direction allows for quick installation with standard H-frame wire stakes, making it a top choice for real estate signs, political campaigns, and event signage.
Compatible with UV flatbed printing, screen printing, vinyl overlays, and decals, this 4mm Coroplast panel delivers a smooth, professional finish for short- to medium-term signage applications.
Common Applications
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Yard signs
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Political & campaign signs
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Real estate signage
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Contractor & jobsite signs
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Event & directional signage
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Promotional outdoor graphics
Key Features
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Industry-standard 4mm thickness
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18" x 24" compact, cost-effective sign size
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24" flute direction for H-frame compatibility
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Lightweight yet rigid construction
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Weather-resistant and waterproof
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Smooth surface for printing or vinyl application
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Easy to cut, drill, and install
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Recyclable polypropylene (PP – Resin Code #5)
Specifications
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Material: Corrugated Polypropylene (Coroplast®-style)
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Thickness: 4mm (0.157")
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Size: 18" x 24"
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Flute Length / Direction: 24"
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Color: White
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Packaging: Each
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Finish: Smooth printable surface
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Indoor / Outdoor Use: Yes
Why Buy This Sign Blank?
✔ Fits Standard H-Frames – Designed with a 24" flute direction to accept most industry-standard wire H-frame stakes
✔ Professional Print Surface – Smooth, treated polypropylene surface ideal for UV flatbed printing, screen printing, or vinyl graphics
✔ Indoor & Outdoor Ready – Waterproof, weather-resistant, and UV-stable for reliable outdoor performance
✔ Lightweight but Rigid – Easy to transport, install, and remove while maintaining structural integrity
✔ Cost-Effective Sign Solution – Perfect for short- to medium-term signage without sacrificing quality
Size Comparison Guide
Not sure which size is right for your project?
| Size | Best Use Case |
|---|---|
| 18" x 24" | Yard signs, political campaigns, contractor signage, promotions |
| 24" x 36" | Real estate signs, directional signage, larger outdoor displays |
- Need a larger format? View our 24" x 36" 4mm Corrugated Plastic Sign Blanks for increased visibility.
Frequently Asked Questions
Q: Will this sign blank fit standard H-frame wire stakes?
A: Yes. The 24" flute direction is specifically designed for compatibility with most industry-standard H-frames.
Q: Can this be printed on directly?
A: Absolutely. These 4mm corrugated plastic sheets are compatible with UV flatbed printing, screen printing, and vinyl graphics.
Q: Is this suitable for outdoor use?
A: Yes. The material is waterproof, weather-resistant, and UV-stable, making it ideal for outdoor signage.
Q: Can I reuse this sign blank?
A: Yes. With proper handling, these panels can be reused for multiple applications.
Q: Can I cut or drill this material?
A: Yes. Corrugated plastic is easy to cut, drill, and fabricate using standard shop tools.
Pair With These Accessories
Increase convenience and upsell value by pairing this sign blank with:
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Wire H-Frame Stakes
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Step Stakes
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Outdoor-Grade Vinyl Graphics
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Application Tape for Vinyl Installation
Pro Tip for Sign Shops
For higher wind areas or longer-term outdoor installs, consider upgrading to 10mm Corrugated Plastic for added rigidity and durability.
