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How to Cut PVC Sheet: Which Saw Suits Which Board?
Thin foam PVC sheet up to about 5 millimetres thick can be cut with a sharp snap-off knife along a steel rule. For thicker or rigid PVC sheet, use a jigsaw with a fine blade for plastics, or a circular saw with a fine-toothed tungsten carbide-tipped (TCT) blade for long straight cuts.
Whichever tool you use, feed it at an even pace so the material does not heat up and melt. Below you will find how to cut PVC sheet cleanly, which blade for PVC to choose and how to finish the edge.
What will you learn in this article?
- Rigid or foam PVC: what difference does it make when cutting?
- When is a knife enough?
- Which saw should you use for thicker PVC sheet?
- Which saw blade should you choose for PVC?
- How do you prepare for cutting PVC?
- How do you prevent melting and chipping?
- Is cutting PVC harmful?
- How do you finish the edge of PVC?
- Frequently asked questions about cutting PVC sheet
- In short: cutting PVC sheet
Rigid or foam PVC: what difference does it make when cutting?
PVC sheet comes in two main types:
- Foam PVC is light and relatively soft. The core is full of tiny air bubbles. You can cut thin sheets with a knife, and thicker sheets saw easily.
- Rigid PVC is solid, heavier and stiffer. It is used for things such as fascia boards, cover panels and technical applications. This material is more brittle and can chip if you use the wrong blade.
In both cases, PVC heats up quickly through friction. Too high a speed with too slow a feed makes the plastic melt and stick back together behind the blade.
This guide covers PVC sheet. For pipes, guttering and PVC flooring, other techniques work better.
When is a knife enough?
Foam PVC up to about 5 millimetres thick can be cut with a snap-off knife or utility knife. This is how:
- Lay a steel rule on the line and hold it in place with a clamp.
- Draw the knife along the rule several times with light pressure. Do not try to cut through in one go.
- With thin sheets, you can snap the sheet over the edge of the table after a few passes. Then cut through the other side.
This does not work well on rigid PVC. That needs to be sawn.
Which saw should you use for thicker PVC sheet?
| Saw | Best for | Blade | Setting |
|---|---|---|---|
| Jigsaw | Curves, cut-outs, shorter straight cuts | Fine-toothed blade for plastics | Medium speed, pendulum off or low |
| Circular saw | Long straight cuts, thick sheets | Fine-toothed TCT blade for plastics or non-ferrous metal | Shallow cutting depth, guide rail or batten |
| Bandsaw | Shapes in thicker sheets (workshop) | Fine-toothed bandsaw blade | High band speed, steady feed |
| Multi-tool | Small cut-outs | Plunge-cut blade for plastics | Low to medium speed |
For most jobs at home, a jigsaw will do. A cordless jigsaw from the Maxxpack 18V range has no cable, which is handy on a ladder or scaffold. If you have a lot of long straight cuts to make, a cordless circular saw with a suitable blade is quicker.
Which saw blade should you choose for PVC?
Always choose a blade with fine teeth and a sharp cutting edge.
- Jigsaw: a blade for plastics or a fine blade for non-ferrous metal. Small teeth with little set give a smooth edge.
- Circular saw: a TCT blade with a high tooth count, ideally one the manufacturer recommends for plastics and aluminium. These blades are designed not to snag in hard plastics.
- Mitre saw: for smaller strips and profiles, a fine crosscut blade with a high tooth count works well.
Avoid coarse wood blades. The large teeth snag in the material, causing chipping in rigid PVC and ragged edges in foam PVC.
How do you prepare for cutting PVC?
- Mark out on masking tape. Stick tape over the cutting line and draw on it. The tape protects the surface and reduces chipping.
- Clamp the sheet down. Use clamps or locking pliers. A sheet that vibrates gives a ragged edge.
- Put a sacrificial board underneath. An old board under the workpiece takes the blade and supports both sides of the cut.
- Use a guide. A batten or guide rail keeps you straight.
How do you prevent melting and chipping?
These are the main points to watch while cutting:
- Keep the feed even. Cutting too slowly at high speed creates heat. Pushing too fast causes chipping. Use a test cut to find the pace at which you see clean chips.
- Adjust the speed. If the plastic melts, lower the speed. If the edge chips, raise it slightly and reduce the pressure.
- Pendulum off. On a jigsaw, the pendulum action adds speed in wood, but causes vibration and chipping in PVC.
- Sharp blade. A blunt blade rubs instead of cutting and heats up quickly.
- Pause with thick sheets. Let the blade cool down now and then.
Is cutting PVC harmful?
PVC dust and chips irritate the eyes and airways. Wear safety glasses and a dust mask (FFP2), and work in a well-ventilated room or outdoors. More importantly, do not let PVC get hot or melt, because overheated PVC can give off harmful fumes. Use hearing protection for longer cutting sessions and remove the battery from the tool when you change the blade.
How do you finish the edge of PVC?
After cutting, there may be a burr or some melted material on the edge. Remove it with a fine file or a deburring tool. Then sand with 180 to 240 grit paper. Sand foam PVC gently, as the soft core comes away easily. If you plan to paint or glue the edge later, make sure it is free of dust and grease.
Frequently asked questions about cutting PVC sheet
Can I cut PVC with a wood saw?
A fine handsaw works on thin sheets, but a coarse wood saw causes a lot of chipping. For a clean edge, use a saw with fine teeth, such as a hacksaw or a fine-toothed blade in a jigsaw.
Why does my PVC melt when I cut it?
The blade is getting too hot. That is caused by too high a speed, a blunt blade or cutting too slowly. Lower the speed, use a sharp blade for plastics and keep a steady, constant pace.
How do I cut a PVC sheet as straight as possible?
Use a circular saw or jigsaw along a clamped batten or guide rail. Clamp the sheet as well, so it cannot shift. Measure the distance between the side of the blade and the edge of the base plate, so you know where to place the batten.
Can I cut PVC sheet with a multi-tool?
Yes. For small cut-outs, or for trimming a sheet that is already fitted, a multi-tool with a plunge-cut blade for plastics works well. For long cuts it is too slow and the edge will be less neat.
In short: cutting PVC sheet
Cut thin foam PVC with a sharp knife along a steel rule, and saw thicker or rigid PVC with a jigsaw or circular saw fitted with a fine blade for plastics. Keep the feed even, switch the pendulum off and use a sharp blade, so the plastic does not melt or chip. Work with safety glasses, a dust mask and good ventilation, and stop if the PVC starts to smell.
