Coroplast / Corrugated Plastic
Coroplast is a brand name commonly used for corrugated polypropylene sheet. The material is light, economical, easy to cut, and widely used for yard signs, construction signs, event signs, directional signs, and other short-term graphics.
Material
Fluted Polypropylene
Common Sign Gauge
4 mm
Environment
Indoor & Short-Term Outdoor
Graphics
Direct Print · Vinyl
Overview
Corrugated plastic is made from polypropylene with two flat faces connected by internal flutes.
The fluted structure keeps the sheet light while giving it enough stiffness for many temporary sign applications. Coroplast is the best-known brand name in this category, and its manufacturer identifies signs and reusable packaging as core uses.
Thickness
Corrugated plastic is sold in several thicknesses. For sign work, 4 mm is one of the most common gauges because it balances weight, stiffness, cost, and compatibility with standard wire stakes.
Flute Direction
The internal channels are part of the structure. Their direction affects bending, cutting, and how hardware such as wire stakes enters the sheet.
This allows the legs of an H-stake to slide into the channels from the bottom edge.
For custom shapes, folds, or specialty mounting, flute direction should be considered before the sheet is printed and cut.
Printing & Finishing
Coroplast Print is made for graphic work and supports direct and screen printing. The sheets are also easy to cut, route, die-cut, and finish.
Sizes
Most Coroplast signs come out of a standard 4 by 8 foot sheet, so the common sizes are the ones that cut cleanly from it without waste. Picking one of them keeps the price down and lets the sign fit the stakes and frames that already exist.
Mounting
How a Coroplast sign is mounted decides whether it is still standing next week. The flutes make stakes easy, but anything bigger than a yard sign needs a mounting plan before the sheet is printed.
Outdoor Life
Coroplast does not rot or soak up water, so rain is rarely what ends a sign. Sun and wind are. The printed face fades first on a south facing lawn, and wind works the stake holes and corners loose over time.
A season or two outdoors is a realistic expectation for most yard and site signs. If the sign needs to stay up for years, aluminum composite or solid aluminum will outlast it.
For a sign that will be moved, stored and reused, keep it flat and out of the sun between uses. Corners bent in a car trunk are the most common reason a reused sign looks tired.
Local Rules
Most New Jersey towns write temporary signs into their sign ordinance, and the limits usually cover size, how many signs a property can have, and how long they can stay up. Contractor and real estate signs often have their own lines in the code.
Before ordering a large batch for several towns, check each town’s rule or ask us to. Our guide to temporary sign regulations explains what towns typically regulate and where to find the rule for a specific address.
Ordering
We print Coroplast on our flatbed press in Linden, directly onto the sheet, on one side or both. Cutting and hardware are handled in the same shop, so the signs leave ready to put in the ground.
See our Coroplast yard signs page for finished sign options, or request a quote with the size, quantity and where the signs will stand.
Choosing the Material
FAQs
Usually a season or two. Rain does little harm, but direct sun fades the print and wind loosens the stake holes and corners. For a sign that needs to stay up for years, aluminum composite is the better choice.
18 by 24 inches. It cuts cleanly from a 4 by 8 foot sheet and fits the standard wire H-stake, which is why most contractor and real estate signs use it.
Yes. We print directly onto both faces, which is the usual choice for signs that face traffic coming from either direction.
The polypropylene sheet does not absorb water, so it holds up in rain. The printed face and the mounting points are what wear out first.
Choose Coroplast for short campaigns, events and job sites where low cost and easy handling matter. Choose aluminum composite when the sign stays up for years or needs to look flat and permanent.
It depends on the town. Many towns allow small temporary signs without a permit but limit their size, number and how long they stay up, while larger signs can need approval. Check the local ordinance before placing them.
On This Guide
Quick Facts
Fluted Polypropylene
4 mm
Indoor & Short-Term Outdoor
Yard · Event · Construction
Related Materials
Not Sure Which Material Fits?
Send the sign size, location, mounting method, artwork, and a site photo if you have one.
Need Help Choosing a Sign Material?
We can compare materials based on the sign size, location, graphics, mounting method, project term, and site conditions.
This guide covers the material. These pages cover the signs we build from it.