Fluted Polypropylene (Correx)
What Is Fluted Polypropylene?
Fluted polypropylene (Correx) for printing, is a lightweight and durable plastic sheet made of two flat surfaces connected by internal vertical ribs, known as flutes. These flutes provide rigidity and strength while keeping the material lightweight. It comes in thicknesses typically ranging from 3mm to 6mm.
Correx, a registered trademark of Corplex, is the leading brand of fluted polypropylene for printing in the UK. This white polypropylene fast became the environmental choice for customers looking for a substrate giving an environmental solution to PVC and also reducing its carbon footprint.
There are numerous fluted polypropylene boards suitable for printing, available in a variety of colours, both ‘long’ or ‘short’ flute direction, and even a ‘wave’ construction. Some alternatives to Correx would be AkyLux, Biprint, Diplast and Euroflute, but not all of them are manufactured in the UK.
Because of its strength, water resistance, and ease of cutting and handling, fluted polypropylene is widely used, especially for temporary signage, displays, and promotional materials.
Why Use Fluted Polypropylene (Correx) for Printing?
Durable and Weather-Resistant
Unlike cardboard or foam core, fluted polypropylene is waterproof and resistant to UV rays, chemicals, and impact. This makes it perfect for both indoor and outdoor applications. Your printed graphics will stay vibrant and intact even in harsh weather conditions.
Lightweight and Easy to Handle
The hollow flute structure keeps the sheet lightweight, making it simple to transport, mount, and install. Fluted polypropylene can be easily cut, scored, folded, and printed using various methods, allowing for custom shapes and designs. This is a huge advantage for event signage, estate agents, and event boards, which often need to be moved frequently.
Cost-Effective
Fluted polypropylene offers a great balance of affordability and durability compared to materials like PVC or aluminum composite panels. This makes it an excellent choice for budget-conscious projects without sacrificing quality.
Common Printing Techniques for Fluted Polypropylene (Correx)
UV Printing
Highly popular for printing onto fluted polypropylene, UV printing uses inks that cure instantly under ultraviolet light, producing vibrant, scratch-resistant, and weatherproof prints. This technique offers excellent adhesion and supports full-colour photographic quality.
Solvent and Eco-Solvent Printing
These inks penetrate the plastic’s surface, producing durable prints resistant to water and fading. Solvent-based printing is ideal for outdoor signage, delivering long-lasting graphics even under harsh conditions.
Screen Printing
Screen printing is ideal for bold, simple designs and large print runs. It provides vivid colours and great durability but is less suited to complex or photographic images.
Design Tips for Printing Fluted Polypropylene
- Use high-resolution images (at least 300 dpi) to ensure crisp prints.
- Include 3–5 mm bleed areas to avoid unprinted edges after trimming.
- Keep important text and logos away from edges to prevent accidental trimming.
- Use contrasting colours for better visibility, especially for outdoor signs.
- Consider the typical viewing distance when choosing font sizes and design complexity.
Finishing and Installation
Fluted polypropylene is easy to cut with our digital flatbed cutting table. It can also be creased and folded, opening up a wide range of possibilities for use.
For mounting, cable ties can be threaded through the flutes to secure signs to fences or posts. Holes can be drilled for use with screws and penny washers. Double-sided tape or adhesives also work well for flat surfaces, and snap frames can add a more professional touch.
Conclusion
Fluted polypropylene is a versatile, durable, and cost-effective choice for many printing applications. Whether for general signage, event displays, or safety notices, it offers excellent print quality and lasting performance.
For more advice or to order custom printed fluted polypropylene signs, contact us today!