Corflute Sheets: Types, Uses and How to Order Cut to Size

If you've ever stuck a real estate sign in a lawn, protected a new floor during a reno or picked up an election corner sign, you've handled corflute sheets. They're light, cheap, waterproof and easy to cut, which is why they show up on so many job sites and shopfronts. This guide covers what corflute is, the options you'll come across, where it works best and where it doesn't, and how to get it cut to size. It's a polypropylene product at heart, so a lot of what you know about that plastic applies here.

What are corflute sheets?

Corflute is twin-wall corrugated polypropylene sheet. Two thin flat skins are extruded together with a row of parallel ribs between them. Those hollow flutes are what make the sheet so light while still giving it useful stiffness, much like cardboard, except it doesn't turn to mush when it gets wet.

Because the material is polypropylene, it resists moisture, many cleaning chemicals and everyday knocks. It's also easy to cut, drill and fix. The trade-off is that it's not a structural material: it dents, crushes at the edges if clamped too hard, and flexes in strong wind if it's unsupported.

Corflute sheet options: thickness, colour and finish

Not all corflute sheets are the same. When you're specifying one, these are the variables that matter:

Thickness and weight

Thinner sheet suits temporary handheld signs and lightweight dividers. Thicker sheet gives you more rigidity for larger signs, floor protection and packaging. As a rule, the bigger the unsupported span or the more wind exposure, the thicker (or heavier-gsm) sheet you need. Check the exact thickness and flute profile for the product you're ordering rather than assuming.

UV stability

Standard sheet is fine for a few weeks of outdoor use. For anything staying out through an Australian summer, ask for a UV-stabilised grade. Without it, polypropylene becomes brittle and chalky over time.

Colour and print-readiness

White is the default for signage because it gives the best print contrast. Coloured sheet is handy for protection, dividers and colour-coding. If you plan to screen print or direct-print, tell your printer which sheet you're using, because polypropylene usually needs a surface-treated face for ink to bond properly.

Flute direction

The sheet is stiffer across the flutes than along them, and it folds more cleanly along the flute direction. For signs that will be staked, running the flutes vertically lets you slide a stake straight into the channels. Always specify the flute direction on a cut-to-size order.

Where corflute sheets are used

Corflute's low cost and light weight make it a go-to for jobs where the sheet won't be around forever, or where volume matters. Common uses include:

Signage: real estate boards, site safety signs, event wayfinding, promotional and election signs.

Surface protection: covering floors, benchtops, stair treads and door frames during building, painting and moving.

Packaging and storage: layer pads, dividers, reusable trays and protective liners.

Garden and farm: plant protection, temporary shelter panels, and seedling tray separators.

Displays and craft: pop-up displays, school projects, model-making and mock-ups.

When to choose something other than corflute

Corflute sheets aren't the answer to every problem. If you need a flat, premium-looking face with clean cut edges, a solid-core alternative is usually better. Uniboard Foamlite ECO polypropylene sheet is a foamed polypropylene board with no visible flutes, so edges look neater and printed faces tend to look smoother.

For signs that need to be rigid and long-lasting, such as shopfront panels or machine labels, a solid PVC sheet gives you a harder, more durable surface. And if you need real impact strength or clarity, acrylic or polycarbonate are in a different league altogether. Corflute's strength is cost and weight, not longevity.

Cutting and fixing corflute sheets

For a few straight cuts, a sharp utility knife and a metal straightedge work fine. Use a fresh blade, because a dull one crushes the flutes and leaves a ragged edge. For repeat shapes, rounded corners, cut-outs or handle slots, CNC routing gives you consistent results across a whole run.

For fixing, cable ties through the flutes, eyelets, stakes and tape are the usual options. Glue can be unreliable on polypropylene because the surface has low adhesion, so test any adhesive on an offcut first.

How to order from Plastic Online

Start by deciding the finished size, the flute direction, the thickness and whether the job is indoor or outdoor. Then use our pricing calculator to enter your dimensions and see live pricing before you commit. Orders ship Australia-wide from our Molendinar workshop on the Gold Coast.

Check the polypropylene range for current sheet options. If you're after a specific flute profile, colour or UV grade and can't see it listed, get in touch and our team will tell you what's possible. Giving us your intended use, such as outdoor signs on stakes or floor protection, helps us point you to the right sheet the first time.

Ready to get your sheets cut? Enter your sizes in our instant cut-to-size price calculator and see exactly what your job will cost from Plastic Online.