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You’ve probably seen lightweight plastic signs outside homes, stores, or construction sites. Real estate agents use them to advertise properties, while local businesses rely on them for promotions and events.
Many Americans call these products Coroplast signs.
But what makes this material so popular, and how do sign shops choose the right sheets?
What Are Coroplast Signs Made Of?
Coroplast® is a brand name associated with corrugated plastic sheets. However, people often use the term when referring to similar signs made from corrugated polypropylene (PP).
These sheets have two flat surfaces connected by internal ribs. The hollow structure keeps the material lightweight while providing stiffness.
Unlike cardboard, PP does not readily absorb water. Therefore, corrugated plastic works well for many temporary outdoor signs.
At Zibo Junhui Plastic Co., Ltd., we manufacture PP corrugated sheets for printing companies, sign makers, and advertising material distributors.
Common Applications of Coroplast Signs
Coroplast signs appear in many everyday advertising applications.
Real Estate and Yard Signs
Real estate agents use plastic yard signs to promote open houses, property listings, and rental opportunities.
Meanwhile, local businesses use similar signs for seasonal promotions, lawn services, and community events.
Political and Campaign Signs
Campaign organizers often choose corrugated plastic because it is lightweight and easy to transport.
In addition, sign shops can cut sheets into different sizes for temporary displays.
Construction and Event Signs
Contractors use plastic signs for project information and temporary directions.
Event organizers also use them for parking instructions, entrance signs, and promotional displays.
However, applications involving regulated safety signage may require specific materials or performance standards.
What Thickness Is Best for Coroplast Signs?
Thickness affects how a sign handles, bends, and performs during installation.
For many advertising applications, 4mm corrugated plastic is a common choice.
At Junhui Plastic, 4mm is currently our most frequently requested advertising sheet thickness.
In addition, 4mm sheets weighing approximately 750g/m² are among our most common specifications.
However, customers may request heavier sheets when their projects require different stiffness or handling characteristics.
For example, a U.S. customer ordered 4mm sheets weighing 1000g/m².
Although both products have the same thickness, their different weights reflect different material specifications.
Therefore, buyers should compare thickness and weight together instead of relying on thickness alone.
Can You Print Directly on Corrugated Plastic Signs?
Yes. Sign shops can print directly on suitable corrugated plastic sheets.
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