Before you approve a sign order, it helps to understand exactly what material you’re paying for. The right material depends on how and where the sign will be used, how long it needs to stay in place, and the conditions it will face. That’s why buyers often ask, “What is Coroplast?” when comparing sign options.
Here’s the short answer. Coroplast® is a brand name for corrugated plastic sheet. In signage, the word is commonly used for lightweight corrugated polypropylene sign board. That’s the material behind many yard signs, real-estate signs and event signs. It’s lightweight, takes printed graphics well and suits many temporary and short-term jobs.
One point to keep straight: Coroplast is a registered brand, while corrugated plastic is the broader material category. This guide covers how the material is built, where it works, its benefits and limits, outdoor performance, lifespan and how it compares with more rigid, permanent options. If you’re choosing a material right now, LED Sign Company can help match it to your use and location. You can discuss your sign project with our team at any point.
What Is Coroplast Made Of?
Coroplast sheets are extruded twin-wall plastic sheets based on a high-impact polypropylene copolymer, according to the manufacturer. In plain terms, it’s two flat plastic layers with a row of hollow channels between them. Those channels are called flutes. You can see them on the cut edge of any sheet, and that’s the quickest way to recognize the material.
Many corrugated plastic sign materials look similar, but not all of them are Coroplast-branded sheet, and thickness and UV protection can vary by product. When you request corrugated plastic signs from any shop, it’s fair to ask which specific sheet is being used and what it’s suited for.
The flutes are what make this sign material useful. They keep the sheet light, so it’s easy to carry, ship and mount. They also give it enough structure to hold a printed graphic for many everyday sign applications. You get a flat, printable face without the weight of a solid panel.
What Are Coroplast Signs Used For?
Corrugated plastic signs, including Coroplast-branded sheets, are commonly used for temporary, promotional and directional signage. Common examples include:
- Yard and lawn signs
- Real-estate signs
- Event signs
- Temporary directional or parking signs
- Construction and site notices
- Promotional displays
- Short-term business signage
The reason is practical. The sheet is light, so it’s easy to handle and transport. The surface accepts printed graphics, and depending on the application, there are several mounting options. If your project needs a lightweight sign that is easy to move, remove or produce in multiples, corrugated plastic signs deserve a look.
What Are the Benefits of Coroplast Sign Material?
Coroplast sign benefits come down to a few things buyers actually care about.
Lightweight and Easy to Handle
The twin-wall build keeps sheets light. That helps with installation, transport and any project where signs get moved or swapped out.
Moisture Resistance
Compared with paper-based corrugated boards, corrugated plastic is more resistant to moisture. In product materials, the manufacturer describes Coroplast sheet as waterproof and stain-resistant and notes that water and many oils and solvents have little effect at regular temperatures. For signage, treat that as a material trait, not a guarantee for the finished sign.
Printable Surface and Easy to Cut
The flat face takes printed graphics, and the material can be cut to size or shape without heavy fabrication. That flexibility is a big reason it works for many indoor and outdoor display applications.
A Practical Option for Short-Term Signs
Coroplast is often chosen as a practical, economical substrate for short-term printed signage. That doesn’t make it the cheapest option in every case, and it doesn’t mean it fits every job. It means it solves a specific problem well.
Limitations to Know Before You Order
There are trade-offs associated with Coroplast’s flexibility and light weight. It does not have the same stiff, substantial feel as thicker rigid panels or metal-based sign systems, and the sheet itself is not an illuminated sign system. Mounting and support for larger signs in exposed areas also need to be considered. Knowing this up front helps match the material to the right type of project.
Can Coroplast Signs Be Used Outdoors?
Yes, with conditions. Coroplast products are used for both indoor and outdoor applications. But how a sign performs outside depends on several things:
- The specific sheet and its thickness
- UV exposure
- Wind
- Mounting method
- Print and ink system
- Handling
- How long the sign will stay in place
Here’s the distinction that matters. “Outdoor capable” doesn’t automatically mean “best for every long-term exterior sign.” The manufacturer notes that UV protection can be added to specific sheet products, which tells you not every sheet carries the same UV package. If you’re planning a permanent identity sign, an illuminated sign or a structurally substantial installation, another material or sign system may be more appropriate.
If you’re unsure, tell us where the sign will go, how much sun and wind it will see and how long you need it. Then request a quote and we’ll recommend a material that fits.
How Long Do Coroplast Signs Last?
There is no single lifespan that applies to every Coroplast or corrugated plastic sign. How long a sign lasts depends on factors such as:
- Indoor or outdoor use
- Sun and UV exposure
- Wind and weather
- Sheet thickness
- Mounting and support
- Print and ink choice
- Physical handling and storage
- Whether the sign is moved repeatedly
Think about two signs. One is used for a single weekend event. The other sits outside every day for a long stretch. Both might be corrugated plastic, but they’re not the same job. The right decision comes from how long you need the sign and where it will live, not from a generic lifespan claim. Decide your expected use first, then choose the material.
Coroplast vs. Other Sign Materials: When Is It the Right Choice?
A quick comparison helps you see where Coroplast fits. This is a short overview, not a full ranking.
❖ Coroplast vs. PVC and Other Rigid Plastics
Coroplast is lighter and works well for many temporary and promotional uses. Rigid plastic substrates are often preferred when a project needs a smoother, more substantial or longer-term panel.
❖ Coroplast vs. Aluminum and Aluminum-Composite Panels
Metal-based panels are commonly chosen for more permanent exterior applications. Coroplast often makes more sense for lighter, shorter-term signage where lightweight handling and portability matter.
❖ Coroplast vs. Acrylic and Dimensional Signage
These serve a different goal. Acrylic and dimensional signs are usually chosen for visual or architectural impact. Corrugated plastic is mainly a printed-panel substrate. They’re not really competing for the same job.
When Should You Choose Coroplast for a Business Sign?
Coroplast is a good candidate when:
- The sign is temporary or short-term
- It needs to be lightweight or portable
- It uses printed graphics
- You need multiple copies
- It’s for events, directions, promotions or site notices
Consider another sign system when the project needs:
- A permanent architectural presence
- Built-in illumination
- High structural rigidity
- Premium dimensional construction
- Long-term site identification
None of this makes Coroplast cheap or inferior. Different materials solve different problems. LED Sign Company can help you decide whether corrugated plastic, a rigid panel, an illuminated sign or another custom format best matches your project.
Frequently Asked Questions About Coroplast Signs
Is Coroplast the same as corrugated plastic?
Not exactly. Coroplast® is a specific brand name, while corrugated plastic is the broader material category. Many products fit that description, and people often use “Coroplast” as a catch-all term. If a specific brand matters for your project, ask which sheet will be used.
What is Coroplast made of?
According to the manufacturer, Coroplast sheets are extruded twin-wall plastic based on a high-impact polypropylene copolymer. Two flat outer layers are joined by internal ribs called flutes. That structure keeps the sheet light while giving it enough body for many printed signs.
Are Coroplast signs waterproof?
The plastic sheet itself is described as waterproof in manufacturer materials and is more moisture-resistant than paper-based board. A finished sign is more than the sheet, though. Printed graphics, cut edges, mounting hardware and site conditions all affect performance, so treat waterproof as a material trait, not a project guarantee.
Can Coroplast signs be used outdoors?
Yes, with conditions. Coroplast products are used indoors and outdoors, but results depend on the sheet, thickness, sun exposure, wind, mounting, print method and how long the sign stays up. It suits many temporary outdoor uses. A permanent exterior identity sign may call for a different material or sign system.
How long do Coroplast signs last?
There’s no single number. Lifespan depends on indoor or outdoor use, UV exposure, wind, weather, thickness, mounting, print method and handling. A sign for one weekend event and a sign left outside every day are very different jobs. Share your conditions and expected use period, and we can recommend a fit.
What are Coroplast signs commonly used for?
They’re commonly used for yard and lawn signs, real-estate signs, event signs, temporary directional or parking signs, construction and site notices, and promotional displays. They fit best where the sign is lightweight, printed and needed for a limited time.
Need Help Choosing the Right Sign Material?
The right material depends on a few things: how long the sign will be used, where it will be installed, how it needs to look, what conditions it will face, how it will be mounted and what your budget allows. Clarifying those factors makes the material decision easier.
That’s where we come in. LED Sign Company helps businesses, property managers, event teams and organizations move from “what material should I use?” to a sign that fits the actual application. Contact LED Sign Company to discuss your sign type, location, expected use, quantity and design requirements.
And if your project needs something more permanent, such as an illuminated identity sign, take a look at our custom LED signs. Corrugated plastic is not the right fit for every application, and another sign system may be more appropriate depending on the project.
