One of the biggest advantages of acrylic sheet over glass is that you can cut, drill and shape it yourself with tools you probably already own. No specialist equipment needed. But acrylic has its quirks it’ll crack if you drill too fast, chip if you use the wrong saw blade, and craze if it overheats. Follow these rules and you’ll get clean results every time.
Cutting Acrylic: Three Methods
Method 1: Score and Snap (for straight cuts on thin sheets)
This works on sheets up to about 3mm thick. Use a metal straight edge and a sharp scoring tool (a dedicated plastic scoring blade or a strong craft knife). Score along the line 10-15 times, applying firm, consistent pressure. You’re not trying to cut through you’re creating a stress line.
Once scored, align the score line with the edge of a workbench. Clamp the sheet on the bench side, then apply firm downward pressure on the overhanging side. The sheet should snap cleanly along the score. The snapped edge will be rough smooth it with sandpaper.
Method 2: Saw Cutting (for thicker sheets and complex shapes)
A circular saw, table saw or jigsaw all work, but the blade choice matters. Use a fine-tooth blade designed for plastic or non-ferrous metal something with lots of small teeth rather than a few big ones. A standard wood blade with large teeth will chip the edges badly.
Keep the protective film on during cutting. It prevents surface scratches and gives you a surface you can mark up with a pencil. Cut at moderate speed too fast generates heat that melts and re-welds the cut, too slow can cause chipping. Let the blade do the work without forcing the sheet through.
For jigsaw cutting curves, use a fine-tooth blade (T-shank plastic blade) and keep the speed moderate. Support the sheet close to the cut line to prevent vibration, which causes chipping.
Method 3: CNC or Laser Cutting (for precision work)
If you need complex shapes, tight tolerances or a polished edge finish, Plastic Sheets Direct’s cut-to-size service handles CNC routing and laser cutting. Laser-cut edges on acrylic come out flame-polished smooth and glossy with no post-processing needed.
Drilling Acrylic Without Cracking
This is where most people go wrong. Standard twist drill bits for metal or wood have a cutting angle that grabs the acrylic and cracks it especially as the bit breaks through the back face.
The fix: Use an HSS drill bit and either buy a dedicated plastic drill bit (ground to a 60° point angle instead of the standard 118°) or modify a standard bit by flattening the cutting edge slightly with a grinding wheel. The goal is a scraping action rather than a grabbing action.
Speed matters. Drill at slow to moderate speed. High RPM generates heat, which melts the acrylic around the hole and can cause it to crack as it cools. If the acrylic starts producing strings rather than chips, you’re going too fast.
Support the back. Place the acrylic on a flat piece of scrap wood and clamp it down. This prevents the drill from blowing out the back face as it breaks through. Drill through the acrylic and into the scrap wood beneath.
Pilot hole first. For holes above 6mm diameter, drill a smaller pilot hole first and then enlarge it. Going straight in with a large bit puts too much stress on the material.
Always drill at least 25mm from any edge. Closer than that and you risk the material cracking from the hole to the nearest edge.
Bending Acrylic with Heat
Acrylic is a thermoplastic it softens when heated and holds its new shape when cooled. This is how you make bends, curves and formed shapes.
Line Bending (for a single straight fold)
A strip heater is the ideal tool it heats a narrow line across the sheet, allowing you to fold along that line. If you don’t have one, a heat gun can work on thinner sheets (up to 3mm), though getting an even heat line takes practice.
Heat the sheet along the bend line until it becomes pliable you’ll feel it soften when you test it with gentle pressure. For 3mm coloured acrylic, this typically takes 3-5 minutes with a strip heater. Don’t rush it. Uneven heating causes internal stress that can crack the bend later.
Once pliable, fold to your desired angle and hold in position until it cools. Use a jig or a straight edge to keep the bend clean and consistent.
Oven Forming (for curves and complex shapes)
For gentle curves, you can heat the entire sheet in an oven at around 160-170°C. Watch it carefully when the sheet starts to sag slightly, it’s ready. Remove it (with heat-resistant gloves) and drape it over your mould or former. It will hold the curved shape as it cools.
Oven forming is most practical for smaller pieces and thinner sheets. Large sheets are unwieldy and hard to handle at temperature.
Finishing the Edges
Saw-cut and snapped edges will be rough and matte. To clean them up:
Sanding: Start with 400 grit wet-and-dry sandpaper (used wet) and work through 800, 1200 and 2000 grit. Each step removes the scratches from the previous one. By 2000 grit the edge should be smooth and translucent.
Polishing: After sanding, use a dedicated acrylic polish and a soft cloth to bring the edge up to a clear, glossy finish. Buffing wheels also work well if you have a bench grinder or pillar drill with a buffing attachment.
Flame polishing: A hydrogen torch or butane torch can melt the very surface of the edge to produce a glass-clear finish. This takes practice too much heat and you’ll distort the edge. It works best on cast acrylic; extruded acrylic tends to bubble.
Common Mistakes to Avoid
Leaving the film on too long. Protective film that’s been exposed to sunlight for weeks becomes difficult to remove. If your sheets will be stored before use, keep them out of direct sun.
Using the wrong adhesive. If you’re bonding acrylic to acrylic, use a solvent cement like Tensol or Extru-Fix. These chemically weld the surfaces together for a strong, clean joint. PVA and superglue don’t work well on acrylic.
Clamping too hard. Acrylic cracks under point loads. When clamping, always use a flat offcut or rubber pad between the clamp and the acrylic surface to spread the pressure.
Browse the full range of acrylic sheets for your next project, or contact the team if you need material advice.