What is corrugated plastic sign material called?

 

What Is Corrugated Plastic Sign Material Called? A Complete Guide for Businesses

Meta Title: What Is Corrugated Plastic Sign Material Called? Complete Guide (2026)

Meta Description: Learn what corrugated plastic sign material is called, how it's made, its advantages, applications, and how it compares with PVC, foam board, and aluminum composite panels.

What Is Corrugated Plastic Sign Material Called?

If you've ever ordered yard signs, construction signs, political campaign signs, or real estate boards, you've probably encountered corrugated plastic.

But what is corrugated plastic sign material actually called?

The answer depends on whether you're referring to the generic material, the industry term, or a brand name.

The most common names include:

Name	Meaning	Common Usage
Corrugated Plastic	Generic name	Worldwide
Corrugated Polypropylene Sheet	Technical material name	Manufacturing
Twin-wall Polypropylene Sheet	Engineering term	Material suppliers
Fluted Polypropylene Sheet	Describes internal flute structure	Europe & Asia
PP Corrugated Sheet	Abbreviation	Industrial purchasing
Coroplast®	Registered trademark often used generically	North America

Although many people call every corrugated plastic sheet Coroplast, Coroplast® is actually a trademark of a manufacturer, much like "Kleenex" is often used to describe facial tissues.

What Is Corrugated Plastic?

Corrugated plastic is a lightweight sheet made primarily from polypropylene (PP) or sometimes polyethylene (PE).

Instead of having a solid core, it contains parallel hollow channels (called flutes) that dramatically reduce weight while maintaining excellent rigidity.

Its internal structure resembles corrugated cardboard, but because it is plastic, it offers much better resistance to:

• Water

• Moisture

• Chemicals

• UV exposure

• Impact

• Outdoor weather

This unique structure makes it one of the most widely used materials for temporary and medium-term outdoor signage.

How Corrugated Plastic Is Manufactured

The production process typically consists of:

Manufacturing Step	Description
Raw Material Mixing	Polypropylene resin mixed with additives and color masterbatch
Extrusion	Molten PP is extruded through a specially designed die
Flute Formation	Internal ribs create hollow channels
Cooling	Sheet is cooled while maintaining shape
Corona Treatment	Surface energy increased for better ink adhesion
Cutting	Sheets cut into standard dimensions
Printing	UV digital, screen printing, or flatbed printing

The corona treatment is particularly important because polypropylene naturally has low surface energy, making printing difficult without surface activation.

Standard Sizes

The most common sheet sizes include:

Size	Metric
18 × 24 in	457 × 610 mm
24 × 36 in	610 × 914 mm
48 × 96 in	1220 × 2440 mm
48 × 120 in	1220 × 3050 mm

Custom sizes are also widely available.

Common Thicknesses

Thickness	Typical Applications
2 mm	Packaging inserts
3 mm	Indoor signs
4 mm	Yard signs
5 mm	Outdoor advertising
6 mm	Construction signs
8–10 mm	Heavy-duty displays

Among these, 4 mm corrugated polypropylene is the industry standard for political, real estate, and event signage.

Physical Properties

Property	Typical Value
Material	Polypropylene (PP)
Density	0.90–0.92 g/cm³
Water Absorption	<0.1%
Service Temperature	Approximately -20°C to 80°C
Chemical Resistance	Excellent
UV Resistance	Good (with UV stabilizers)
Recyclability	100% recyclable (PP #5)

Actual values vary depending on manufacturer and formulation.

Why Corrugated Plastic Is Popular

Several properties have made corrugated plastic the preferred material for millions of signs each year.

1. Lightweight

The hollow structure significantly reduces weight while maintaining stiffness.

A corrugated plastic sign typically weighs 60–80% less than an equivalent solid PVC panel.

2. Waterproof

Unlike paperboard or fiberboard, polypropylene does not absorb water.

This makes corrugated plastic suitable for:

• Rain

• Snow

• Humid environments

• Outdoor events

3. Excellent Print Quality

After corona treatment, the material supports:

• UV flatbed printing

• Screen printing

• Digital printing

• Vinyl graphics

Colors remain vibrant with proper UV-resistant inks.

4. Cost-Effective

Corrugated plastic offers one of the lowest costs per square meter among rigid sign materials.

This makes it ideal for:

• Political campaigns

• Election signs

• Promotional events

• Temporary advertising

• Retail sales

5. Easy to Fabricate

It can be:

• Die-cut

• Routed

• Folded

• Stapled

• Riveted

• Heat welded

The internal flutes also make it easy to insert wire H-stakes for lawn signs.

Common Applications

Corrugated plastic is widely used across many industries.

Industry	Applications
Real Estate	Property signs
Construction	Safety signage
Politics	Election yard signs
Retail	Promotional displays
Education	School notices
Agriculture	Field identification
Warehousing	Temporary labels
Events	Directional signage
Manufacturing	Process identification

Corrugated Plastic vs Other Sign Materials

Property	Corrugated Plastic	PVC Board	Foam Board	ACM (Aluminum Composite)
Weight	Very Light	Medium	Very Light	Medium
Waterproof	Excellent	Excellent	Fair	Excellent
Outdoor Life	1–5 years	3–7 years	Limited	5–10+ years
Impact Resistance	High	High	Low	Very High
Cost	Low	Medium	Low	High
Recyclable	Yes (PP #5)	Limited	Limited	Yes (depends on recycling facilities)

Environmental Considerations

Polypropylene is classified as Resin Identification Code #5 (PP) and is recyclable in many industrial recycling systems. 

hile acceptance varies by municipality, PP is generally more recyclable than many composite sign materials. Reusing signs and selecting recyclable substrates can help reduce waste.

Frequently Asked Questions

Is Coroplast the same as corrugated plastic?

No. Coroplast® is a brand name, while corrugated plastic is the generic term for fluted polypropylene sheet.

Is corrugated plastic waterproof?

Yes. Polypropylene does not absorb water, making corrugated plastic suitable for outdoor use in rain and humid environments.

How long do corrugated plastic signs last outdoors?

Typical outdoor service life is:

• 1–2 years without UV stabilization

• 2–5 years with UV stabilizers and high-quality UV printing

Actual lifespan depends on climate, sun exposure, wind, and installation method.

Can corrugated plastic be recycled?

Yes. Most corrugated plastic sheets are made from polypropylene (PP, recycling code #5) and can be recycled where appropriate collection and recycling facilities are available.

What thickness is best for yard signs?

For most applications, 4 mm corrugated polypropylene provides an excellent balance of rigidity, weight, and cost. Thicker sheets (6–10 mm) are better suited to larger or more demanding outdoor installations.

Conclusion

Corrugated plastic—also known as corrugated polypropylene, twin-wall polypropylene, or fluted polypropylene sheet—has become one of the world's most popular sign substrates because it combines low weight, durability, weather resistance, excellent printability, and affordability.

Whether you're producing real estate signs, political campaign boards, retail promotions, construction signage, or event displays, corrugated plastic remains a practical and economical choice.

 Understanding its terminology, properties, and performance helps businesses choose the right material for each application while balancing cost, longevity, and sustainability.

References

1. ASTM International – Standards related to plastics testing (e.g., density, tensile properties, and environmental conditioning).

2. Plastics Industry Association – Information on polypropylene materials and plastics recycling.

3. U.S. Environmental Protection Agency – Guidance on waste reduction and recycling practices.

4. European Bioplastics – Resources on plastics and sustainability.