Cast Acrylic Sheet

The fabricator’s grade — machines cleanly, engraves sharply, flame-polishes to an optical edge.

Cast acrylic is polymerised between glass plates rather than pushed through a die. The resulting higher molecular weight is what fabricators are actually buying: it machines without gumming, engraves with sharp edges, and flame-polishes to genuine optical clarity.

If your workshop cuts, routes, drills or polishes acrylic, this is the grade to specify. Extruded sheet in the same operations softens, welds behind the cutter and leaves a hazy edge.

Specification

Property	Specification
Process	Cell cast between glass
Thickness	2 mm – 30 mm
Thickness tolerance	Approx. ±10% (inherent to casting)
Widths	1220 mm and 1830 mm standard; other widths to order
Machining	Excellent — clean chip, no gumming
Flame polishing	Yes — produces an optically clear edge
Laser cutting	Yes — leaves a characteristic frosted edge
Chemical resistance	Better than extruded
Colours	Clear, opal, frosted, full colour range

Cast against extruded, in the workshop

	Cast acrylic	Extruded acrylic
Thickness tolerance	Looser (±10%)	Tighter (±5%)
Machining	Excellent — clean edges, polishes well	Fair — softens and gums at speed
Laser cutting	Frosted edge	Clear polished edge
Thermoforming	Wider forming window	Narrower, but easier at low temperature
Chemical resistance	Better	Lower
Cost	Higher	Lower

The tolerance line surprises buyers: cast sheet is less dimensionally consistent than extruded, because casting cannot control thickness as tightly as a die. If your process depends on exact thickness — slot fitting, precise glazing pockets — extruded is the better choice despite being harder to machine.

Typical applications

CNC machined components and prototypes
Laser and router cut lettering and shapes
Engraved awards, signage and plaques
Bonded display cases and enclosures
Thick-section fabrication, tanks and aquariums

Questions buyers ask

Why does my extruded acrylic melt when I cut it?

Extruded acrylic has a lower molecular weight and softens at lower temperature, so it gums behind the cutter. Cast acrylic is the correct material for machining work.

Can cast acrylic be laser cut?

Yes, and it cuts cleanly, but the edge comes out frosted rather than polished. For a clear laser-cut edge, extruded acrylic is the better choice.

What thickness tolerance should I expect?

Around ±10% is normal for cast sheet worldwide — it is a property of the process, not a quality defect. If you need tighter, order extruded or ask us to machine to thickness.

Request a quote MOQ & shipping

Fabrication-grade supply check

Cast acrylic sheet manufacturer inputs

Choose cast acrylic when the job depends on machining, engraving, edge finishing or a fabrication behaviour that must be approved before volume production. “Cast” identifies the process, but it does not fix colour, thickness tolerance, flatness, optical appearance or the result after machining.

Prepare a fabrication-specific enquiry

Finished drawing, thickness, sheet size and quantity.
Machined features, edge appearance and any polishing requirement.
Colour or clear reference, viewed area and acceptable visual variation.
Inspection points, packing, destination and requested production sample.

Compare the broader acrylic manufacturing route, then include the drawing and sample requirement in the RFQ. The quotation should identify the offered process and the evidence supplied with that order.

From the factory