Sign Material
Corrugated Plastic
On this page
At a glance
- Type Twin-wall polypropylene
- Use Indoor / Outdoor
- Water Fully waterproof
- Thickness 4, 6, 10 mm
- Also Called Coroplast / fluted PP
Overview
What is Corrugated Plastic?
Corrugated plastic is a lightweight twin-wall sheet made from polypropylene resin — a fluted core sandwiched between two flat outer layers, giving it the same structure as corrugated cardboard but with the durability and weather resistance of plastic. You’ll also hear it called fluted polypropylene, or by brand names like Coroplast and IntePro.
Its blend of low cost, light weight, water resistance, and printability makes it a go-to wherever you need a durable surface on a budget. Standard versions hold up outdoors for several months; UV-stabilized grades extend that to a few years, which is why it dominates short-to-mid-term outdoor signage.
Specifications
Key properties
| Material | Twin-wall (fluted) polypropylene resin |
|---|---|
| Common thicknesses | 4mm, 6mm, 10mm |
| Finish | Matte or gloss; opaque and translucent options |
| Indoor / outdoor | Both; waterproof and weather-resistant |
| Outdoor lifespan | ~6–12 months standard; 3–5 yrs UV-stabilized |
| Fabrication | Screen & direct print, vinyl; scores and cuts cleanly |
Where it's used
Common applications
The classic stake-mounted outdoor sign.
High-volume, low-cost signs for events and politics.
Weatherproof site, hazard, and directional boards.
Lightweight displays and promotional signage.
Protective Barriers
Floor and wall protection on job sites.
Packaging & Trays
Reusable, recyclable corrugated containers.
Honest assessment
Strengths & considerations
Strengths
- Inexpensive — excellent for bulk and temporary signage
- Fully waterproof and weather-resistant
- Lightweight yet rigid thanks to the fluted core
- Prints and scores cleanly for fast production
- Recyclable polypropylene construction
Considerations
- Standard grades fade and degrade after months outdoors
- Functional rather than premium in appearance
- Fluted ribs can show through or affect print alignment
- Punctures and crushes more easily than rigid boards
Working with Signs New York
How we fabricate Corrugated Plastic signs
Compare Materials