Perspex Cut to Size: Choosing the Right Grade for Your Job

The grade of acrylic matters as much as the dimensions

Most people ordering Perspex cut to size focus almost entirely on length and width. That's understandable — dimensions are what you can measure on site. But the grade, finish, and formulation of the sheet you choose will determine whether the finished part looks right, holds up in service, and can actually be fabricated the way you intend. This guide walks through the main Perspex grades available, what each one is suited to, and the questions worth asking before you place an order.

Standard clear acrylic: the workhorse grade

Standard clear acrylic — often sold under the Perspex® brand — is a cast or extruded thermoplastic sheet with excellent optical clarity, good UV stability, and a surface hardness that resists everyday scratching better than polycarbonate. It's the default choice for the majority of cut-to-size jobs: display cases, point-of-sale fixtures, protective screens, glazing inserts, and architectural features.

Cast acrylic is produced by pouring liquid monomer between glass moulds, which gives it tighter thickness tolerances, better optical consistency, and superior machinability compared to extruded sheet. Extruded acrylic is more economical and works fine for general signage and display work where optical precision isn't critical. If you're laser cutting intricate shapes or flame-polishing edges, cast sheet will give you cleaner results.

If you need standard clear sheet and want to order online before committing to a larger fabricated job, you can buy acrylic sheet online through our sister site Perspex Online, which stocks a range of thicknesses ready to ship.

Coloured, tinted, and frosted grades: when aesthetics drive the spec

Not every cut-to-size job calls for clear sheet. Coloured and specialty-finish acrylics are widely used in signage, retail fitouts, architectural screens, and decorative fabrication — and the grade you choose affects both the visual result and how the material behaves under cutting and forming.

Tinted acrylic transmits light with a colour cast while remaining translucent. It's common in illuminated signage, light boxes, and feature panels where you want colour without blocking the backlight entirely. The key spec to check is light transmission percentage — a deep tint that looks great as a flat panel can kill the output of an LED light box if you haven't accounted for it.

Frosted acrylic diffuses light evenly and provides visual privacy without fully blocking it. It's used in office partitions, bathroom screens, light diffuser panels, and anywhere a clean matte finish is preferred over gloss. PERSPEX® Frost is a manufactured frost finish rather than a surface-applied film, which means it won't peel or scratch off the way a vinyl frost film can.

Opaque coloured sheet — such as PERSPEX® Spectrum — is used for signage faces, decorative panels, and fabricated display components where a solid, consistent colour is needed. The colour runs through the full thickness of the sheet, so routed or laser-cut edges show the same colour as the face, which is useful for 3D fabricated acrylic letters and edge-lit signage applications.

High-impact acrylic: when standard sheet isn't tough enough

Standard acrylic is brittle under sharp impact — it will crack rather than deform. For applications where the sheet might take a hit, you have two options: switch to polycarbonate, or specify high-impact acrylic .

High-impact acrylic is a modified formulation that retains most of the optical clarity and surface hardness of standard acrylic while offering significantly better resistance to cracking and shattering. It's a useful middle ground for safety glazing, protective screens, and machine guards where polycarbonate's tendency to scratch and yellow over time is a concern, but standard acrylic's brittleness is a risk.

If the application demands maximum impact resistance — think industrial machine guards, security barriers, or anywhere a person could fall into the sheet — polycarbonate is still the better call. It's substantially tougher than any acrylic formulation. But for retail displays, sneeze guards, and light-duty protective applications, high-impact acrylic gives you better optics and a harder surface in a single sheet.

Thickness selection and edge finish: what to specify when ordering

Once you've settled on the grade, thickness and edge finish are the two remaining variables that affect both the final result and the fabrication process.

Thickness is primarily a structural and aesthetic decision. Thinner sheet (2–3 mm) is fine for display inserts, light diffusers, and decorative panels that are fully supported in a frame. Freestanding panels, glazing applications, and anything that spans a significant unsupported distance needs more thickness — 6 mm, 10 mm, or heavier depending on the span and load. If you're unsure, ask your fabricator to run the numbers rather than guessing.

Edge finish is often overlooked on cut-to-size orders. A raw saw-cut edge is functional and fine for edges that will be hidden in a frame or rebate. A machine-polished edge is appropriate for display work where the edge is visible. A flame-polished edge gives the clearest, glassiest result and is the standard for high-end display cases, acrylic furniture, and retail fixtures. Specify this upfront — retrofitting a polished edge after the fact takes more time than doing it during the cut.

If your job involves bending the sheet after cutting — for a curved guard, a display stand, or an architectural feature — make sure you're ordering cast acrylic rather than extruded. Cast sheet bends more predictably and is less prone to stress cracking during the forming process. Our acrylic bending and forming service handles this in-house, so if you need both cutting and forming done, it can all be managed as a single job.

Acrylic versus other clear plastics: making the right call

Acrylic is the right material for most cut-to-size glazing and display work, but it's not always the best choice. Here's a quick comparison of the alternatives that come up most often:

PETG is tougher than acrylic and easier to thermoform at lower temperatures. It's a good choice for machine guards and food-contact applications. It doesn't polish as well as acrylic and has a slightly lower surface hardness, but it's significantly less brittle.

Polycarbonate is the go-to for maximum impact resistance. It's used in machine guards, security glazing, and safety barriers. It scratches more easily than acrylic and can yellow with prolonged UV exposure unless it's a UV-stabilised grade.

Acrylic wins on optical clarity, surface hardness, UV stability, and ease of polishing. For display work, signage, and architectural glazing in non-impact-critical applications, it's the right material. The decision to switch to polycarbonate or PETG should be driven by a specific performance requirement, not habit.

If you're not sure which grade suits your job, bring the application details — dimensions, environment, load, and finish requirements — and we'll recommend the right sheet before you commit to an order.

P&M Plastics cuts acrylic and Perspex to size from our Gold Coast facility, with polished and raw edge options, a full range of grades and thicknesses, and in-house forming and fabrication if your job needs more than a straight cut. For smaller or standard-size orders, acrylic cut to size is available directly through our materials page. For custom work, complex shapes, or anything that involves bending, bonding, or assembly, get in touch with our team with your dimensions and application details and we'll turn around a quote.