Cost guide Cast acrylic
Cast acrylic usually costs more than extruded acrylic because the sheet is made differently, and because the parts that need cast also need more stations after the sheet. The premium is not a quality medal. It is the price of a route that polishes and solvent-bonds cleanly. If the part does not need that route, you are paying for a sheet you will not use.
The short answer
Working answer. Cast costs more for two stacked reasons: the sheet is a slower, batch process, and the jobs that specify cast usually add polish and solvent joints. Pay the premium when an edge or a joint faces the customer. Do not pay it because the email said “better acrylic.”
Why the sheet costs more
Cell-cast acrylic is poured between plates and cured. That is the process ISO 7823-1 describes. It is a batch. Plate, pour, cure, separate. Extruded acrylic is pushed continuously through a die — ISO 7823-2. Continuous production is generally the cheaper way to make a thin, consistent sheet.
That process difference is why a cast blank usually enters the factory at a higher sheet price than an extruded blank of the same nominal thickness and tint. It is not because cast is a luxury brand. A named mill can sit on top of either route and move the price again.
Thickness works in the same direction on both routes: more plastic, more money. A thick cast plinth is expensive because it is thick and cast, not because of a single “cast multiplier.”
Why the part costs more
Buyers rarely buy cast sheet and stop. They buy it because:
- The edge will be polished, and cast polishes more cleanly than extruded.
- The joint will be solvent-bonded and meant to disappear. Cast-to-cast is the normal clear joint on a display box.
- The face is thick, or optical, or both.
Each of those is a station: programming, a crew, a reject risk. Blush on a joint is scrap. A polish that does not match the sample is scrap. Scrap is in the price whether or not it is a line on the quote.
So a “cast cube” price is sheet plus stations. Comparing it with an extruded holder that was only laser-cut is comparing two different factories of work. The route gap and the station gap are both real. Only one of them is the sheet.
What actually moves the gap
| Factor | Effect on the gap |
|---|---|
| Thickness | Thicker cast uses more of the expensive blank. The gap usually grows with gauge. |
| Tint and mill | A named optical or a color can exceed the route gap. Generic clear is the fair comparison. |
| Polish and joints | Often larger than the sheet gap on a small cube. An extruded part with no polish is not the same job. |
| Quantity | Sheet route is per piece. Setup is per design. A tiny first run makes both look expensive. |
| Yield | Tight optical faces raise scrap on either route. Scrap is not free on the cheaper sheet. |
Anyone who quotes “cast is X percent more” without thickness, mill, and the station list is guessing. Ask for the two routes on the same drawing if you want the real gap.
Where the premium is wasted
Hidden back of a cube
If it is not polished and not a show joint, extruded is often enough. Write “extruded, hidden” so you are not billed for cast you will not see.
Simple bent holder
One bend, no polished edge. Extruded is the usual cost route. Cast here is a habit, not a requirement.
Cast specified, then flame-only edge
You paid for a sheet that can take a diamond polish, then specified a finish extruded could also wear. Match the finish to the route.
“Cast” used to mean outdoor
Weathering is a grade. Cast is a process. Specify the grade if the face sits in a window. Do not buy cast as a UV substitute.
Constructions where the premium is usually earned — polished faces, clear joints — are the retail set: boxes, trays, and stands.
How to compare two quotes
- Same route on the same members. Cast versus cast, or a stated mix versus the same mix.
- Same thickness, tint, and mill requirement.
- Same edge finish and same joint method.
- Same quantity and same Incoterm.
A gap that remains after those four match is a real price gap. A gap before they match is a different product. This is the same rule as any acrylic quote: align the construction, then read the number.
Sanait prices acrylic work with the route stated. A brief that says only “acrylic” will be asked which sheet. How that plant takes a brief is on the FAQ. Scope is on the about page.
FAQ
Why is cast acrylic more expensive?
The sheet is a batch pour-and-cure process, generally costlier than continuous extrusion. Parts that need cast usually also add polish and solvent joints, which cost more again.
How much more does cast cost?
There is no single percentage. Thickness, mill, tint, polish, joints, and quantity all move it. Ask for both routes on the same drawing.
Is the more expensive sheet always worth it?
On a polished, bonded show face, usually yes. On a hidden back or a simple bend, usually no. The edge and the joint decide, not the adjective.
Does a higher price mean it will not yellow?
No. Yellowing is grade and exposure. Cast is the manufacturing route. Specify UV performance separately if the face is in sun.
Can I mix cast and extruded to save money?
Yes, if you assign them: cast on show faces and joints, extruded on hidden members. Write it on the drawing so the saving is real and the look is agreed.
Is a cheap “cast” quote a warning?
Ask what cast means on that quote: which mill, which members, whether joints are included. A low number that dropped the polish or switched a face to extruded is a different part.
Sources
The two routes are defined by the sheet standards. They do not set a price.
- ISO 7823-1:2003, Plastics — Poly(methyl methacrylate) sheets — Part 1: Cast sheets. iso.org
- ISO 7823-2:2003, Plastics — Poly(methyl methacrylate) sheets — Part 2: Extruded sheets. iso.org
- “Poly(methyl methacrylate).” Wikipedia. en.wikipedia.org
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