Acrylic Edge Finishes: Saw-Cut, Flame-Polished, and Diamond-Polished
The edge is where a cut piece of acrylic shows its quality. The face is already smooth from the factory; the cut edge is what you actually choose. We offer three finishes — standard saw-cut, flame-polished, and diamond-polished — and the right one depends entirely on whether the edge will be seen, glued, lit, or hidden. Picking by appearance alone is a common mistake, because the glossiest edge is the wrong choice for some jobs.
Standard saw-cut
Every piece ships saw-cut as standard. The edge is clean, uniform, and square, with a satin-matte surface left by the saw teeth — not frosted, just lightly tooled rather than glossy. It is the right finish in more cases than people expect: anywhere the edge is framed, captured, or hidden, and anywhere you plan to glue. For solvent welding in particular, the saw-cut surface is the best choice — the slight tooth gives the joint something to bond to, and a polished edge actually welds worse because the smooth, sometimes stressed surface bonds less reliably.
Flame-polished
A flame-polished edge is passed through a hydrogen or propane flame that briefly melts the surface smooth, leaving it glossy and transparent. It is the best look-per-effort finish for display pieces — a fast way to turn a matte edge into a clear one. The trade-offs: the melted surface rounds slightly at the corners rather than staying perfectly crisp, it is not ideal if you intend to solvent weld that edge later, and the heat can introduce internal stress. That last point matters for parts that will be drilled near the edge, where added stress raises the chance of cracking.
Diamond-polished
A diamond-polished edge is machined flat and clear by a diamond cutter rather than melted. The result is optically clear, flat, and crisp right to the corner — the highest-end finish. It is the choice for premium display work, for edge-lit pieces where light enters through the edge and any haze or roundness would scatter it, and for thick clear stock where the full depth of the edge is on view. It holds the corner sharp in a way a flame cannot.
Side by side
| Finish | Appearance | Best for | Avoid when |
|---|---|---|---|
| Standard saw-cut | Clean, uniform, satin-matte tooling marks | Framed/captured or hidden edges; gluing surfaces | The edge is on display and needs to be clear |
| Flame-polished | Glossy, transparent, slightly rounded corners | Display pieces; best look per effort | You'll solvent weld it, or drill near that edge |
| Diamond-polished | Optically clear, flat, crisp corners | High-end display, edge-lit panels, thick clear stock | The edge will be hidden or glued (over-spec) |
Choosing by project
- Floating shelf: the front edge shows and the rest is captured by brackets. Flame-polished is plenty for the visible front; saw-cut is fine everywhere hidden.
- Sign blank: if it sits in a frame or holder, saw-cut is the right call. If the bare edge is part of the look, flame-polished gives a clean gloss.
- Edge-lit panel:diamond-polished. Light enters the edge, so it must be flat and optically clear — this is the one job where finish quality changes how the piece performs.
- Glued box or enclosure: saw-cut on every edge you intend to solvent weld. Polishing a joint surface works against you here. Save polishing for any exposed top edge, and finish it before assembly.
Ordering
Every piece ships with the standard saw-cut edge included. To upgrade, choose flame-polished or diamond-polished in the configurator when you set your size. For polished finishes on shaped cuts — notched, drilled, or curved pieces rather than plain rectangles — send the details and we will quote it.
Shop acrylic cut to size with your edge finish → · Request a quote for shaped or polished custom work · Cutting & drilling acrylic