Perspex Cut to Size: How to Order and What to Expect

You can order Perspex cut to your exact dimensions — but the quality of the result depends on how well you specify the job

"Perspex cut to size" covers a lot of ground. It might mean a single 600 × 400 mm clear panel for a display case, or fifty identical pieces of tinted acrylic for a shopfront installation. The material is the same; the variables that determine cost, lead time, and finish quality are in the specification. Get those right and the job is straightforward. Get them wrong and you're paying for recuts or chasing tolerances that don't suit your application. This guide walks through every decision point so you can place a clean order and know exactly what you're getting.

Perspex vs acrylic: what you're actually ordering

Perspex is a brand name — the original one, from Lucite International — but in everyday trade usage it's become shorthand for cast acrylic sheet. When someone asks for "Perspex cut to size" they almost always mean cast acrylic, not extruded. The distinction matters because the two are manufactured differently and behave differently under cutting and forming.

Cast acrylic is poured into glass moulds and cured slowly. The result is a denser, more optically consistent sheet with tighter thickness tolerances and better resistance to stress cracking when machined or bent. Extruded acrylic is pushed through a die — it's cheaper and fine for many applications, but thickness can vary more across the sheet and it's more prone to crazing around cut edges if solvents are applied.

For display work, signage, machine guards, and anything that will be bonded or bent, specify cast. For simple protective covers or temporary applications where cost is the driver, extruded is acceptable. Our Acrylic / Perspex material page covers the full range we stock, including clear, opal, and coloured options. If you want genuine PERSPEX® brand sheet, you can also buy acrylic sheet online through our sister site Perspex Online for smaller quantities.

Choosing the right grade and colour for your application

Clear cast acrylic is the default, but it's far from the only option. Here's how to think through the choice:

Impact resistance: Standard acrylic is rigid and optically clear but will crack under a sharp impact. If your application involves physical risk — machine guards, safety glazing, areas with foot traffic — consider high impact acrylic or step up to polycarbonate. Polycarbonate is significantly tougher but yellows faster under UV without UV-stabilised grades. For most indoor display and signage work, standard cast acrylic is the right call.

Colour and light transmission: Tinted and coloured acrylics are available in translucent and opaque finishes. Translucent grades pass light and are used for illuminated signage, light boxes, and diffusers. Opaque grades are used for cut lettering, display panels, and decorative applications. Frosted acrylic sits in between — it diffuses light evenly while maintaining brightness, which makes it popular for privacy screens, bathroom panels, and LED diffusers. Acrylic mirrors are another cut-to-size option worth knowing about — they're shatterproof and available in silver, gold, and coloured finishes for retail fitouts and feature walls.

Thickness: Common thicknesses run from 2 mm through to 25 mm and beyond for engineering applications. For glazing panels and display cases, 3–6 mm is typical. For structural components or anything spanning a significant unsupported distance, go thicker. If you're unsure, describe the load and span and we'll advise.

Cutting methods and edge finishes — what the difference looks like in practice

How a piece is cut determines the edge quality, the minimum feature size achievable, and what finishing is needed afterwards. There are three main methods used for acrylic:

Laser cutting produces a flame-polished edge directly from the cut — on cast acrylic especially, the edge comes off the machine clear and smooth with no secondary finishing required. It's the preferred method for display work, lettering, and any part where the edge will be visible. Minimum feature sizes are small, making it ideal for intricate shapes. Our laser cutting service handles both simple rectangles and complex profiles.

CNC routing is better suited to thicker sheet, large panels, and parts that need drilled holes, rebates, or profiled edges. The cut edge is machined rather than melted, so it's typically matte and may need sanding or flame polishing if appearance is critical. For structural or engineering parts where the edge finish is secondary to dimensional accuracy, CNC is often the right tool. See our CNC router services for more detail.

Straight-line saw cutting is used for simple rectangular pieces where speed and cost matter more than edge finish. It's fast and accurate for right-angle cuts but can't produce curves or internal cutouts. The edge is typically raw and will need finishing if it's going to be visible or bonded.

Rule of thumb: if the edge will be seen or bonded, specify laser. If the part is thick, structural, or needs holes and profiles, specify CNC. If it's a simple rectangle for a non-visible application, saw cut is fine.

How to write a specification that gets you the right result

A vague order produces a vague result. Here's what a complete cut-to-size specification looks like:

Material and grade: Cast acrylic, clear. Or: PERSPEX® Spectrum, colour code [X]. Or: opal acrylic, 40% light transmission.

Thickness: State in millimetres. If you have a tolerance requirement, state it — e.g. 6 mm ±0.3 mm.

Dimensions: Length × Width in millimetres. For non-rectangular shapes, supply a DXF or PDF drawing. For simple shapes with cutouts or holes, a dimensioned sketch is fine.

Quantity: State the number of pieces. Nesting efficiency improves with larger quantities, which can reduce unit cost.

Edge finish: Specify polished, sanded, or raw for each edge. If only certain edges need polishing (e.g. the two visible edges of a shelf), say so — it saves cost.

Masking: Acrylic sheet comes with a protective film or paper masking. Specify whether you want masking left on for transport or removed. If you're doing further fabrication immediately, leaving it on protects the surface.

Our acrylic cut to size service accepts orders for single pieces through to production runs. If your project also involves bending or forming — curved guards, display cases, windscreens — that's handled through our acrylic bending and forming service , which can be combined with cut-to-size in a single job.

Common applications and the spec that suits each one

Display cases and retail fitouts: Clear cast acrylic, 3–6 mm, laser cut with polished edges. Bonded with acrylic cement for invisible joints. This is the bread-and-butter cut-to-size job and the one where edge finish matters most.

Machine guards and safety barriers: Clear cast acrylic 6–12 mm or polycarbonate where impact resistance is the priority. CNC routed with drilled mounting holes. Edge finish is secondary to dimensional accuracy.

Signage and lettering: Coloured opaque or translucent acrylic, laser cut for clean profiles. For illuminated signs, white opal or a translucent colour over an LED source. For cut letters and logos, 3–5 mm opaque acrylic laser cut to shape.

Architectural glazing and screens: Clear or frosted acrylic, 6–10 mm, CNC cut to panel size with polished edges. UV-stabilised grades for outdoor use. For privacy screens, frosted acrylic diffuses light without blocking it entirely.

Sneeze guards and counter screens: 4–6 mm clear acrylic, laser or CNC cut, with or without a base slot. A common post-pandemic fitout item that's still in demand for food service and retail counters.

If your project is more involved than a flat panel — enclosures, tanks, structural assemblies — our custom plastic fabrication service takes cut-to-size as the starting point and adds welding, bending, and assembly to deliver a finished component.

Ready to place an order or work through a specification? Send us your dimensions, material preference, and edge finish requirements and we'll come back with a quote. Contact the P&M Plastics team at /contact — we cut to size from our Gold Coast facility and can advise on material selection, tolerances, and the most cost-effective cutting method for your job.