Material guide Names
In ordinary buying language, plexiglass and acrylic are the same family of plastic: PMMA. Plexiglass is a trade name that became the common word. It is not a different material, and it is not glass. The useful distinction is not the nickname. It is cast versus extruded, and acrylic versus polycarbonate.
The short answer
Working answer. Yes, in the way buyers use the words: plexiglass means acrylic. No, as a specification: plexiglass is a trademark used as a generic, and it does not state grade, cast or extruded, thickness, or finish.
If a quote says “plexiglass” and another says “acrylic,” do not treat them as two materials until you have asked. Ask whether both are PMMA, and whether each is cast or extruded.
The names, sorted
| Word | What it is | What it does not tell you |
|---|---|---|
| Acrylic | The common name for PMMA sheet and parts | Cast or extruded, grade, thickness |
| PMMA | The polymer name: poly(methyl methacrylate) | How the sheet was made |
| Plexiglass / Plexiglas | A trade name for acrylic, widely used as the generic word | Whether this sheet is that brand, or cast vs extruded |
| Perspex | Another acrylic trade name, common in some markets | Grade and process |
| Lucite | Another acrylic trade name | Grade and process |
| Lexan | A polycarbonate trade name — a different plastic | Not an acrylic nickname |
Spelling varies. Plexiglas is the branded form buyers meet on mill sheets. Plexiglass is the common English spelling in emails and search. Treat them as the same request until the sender says otherwise, then confirm the polymer.
Why it is not glass
The “glass” in the nickname is historical. Acrylic was sold as a lighter, shatter-resistant alternative for glazing. The material is still a plastic. It can be polished to a clear face. It is not silica glass, it does not have a glass-hard surface, and a case made from it is an acrylic fabrication, not a glazed window.
Calling it plexiglass on a purchase order does not make the breakage behavior, the scratch behavior, or the weight into glass. Those stay PMMA behaviors, and they still depend on grade and thickness.
Why it is not polycarbonate
The mix-up that causes real orders to go wrong is plexiglass versus Lexan, or “plexiglass” versus polycarbonate. Both can be clear sheet. They are different polymers.
- Acrylic (plexiglass in common speech) is the usual choice for a brand-facing display: cubes, trays, polished edges.
- Polycarbonate is the usual choice when the part may be hit.
- Fabrication does not transfer. Solvent bonding and edge polish that are normal on cast acrylic are not a default on polycarbonate.
If the email says “plexiglass or Lexan, whichever is cheaper,” stop and split the brief. Cheaper here is often a different material, not a discount.
What the nickname leaves out
Two sheets both called plexiglass can be cast or extruded. That difference is the one a display buyer feels: edge polish, solvent joints, thickness tolerance, and price. The nickname does not record it.
ISO 7823-1 covers cast PMMA sheet. ISO 7823-2 covers extruded PMMA sheet. Citing either standard still requires the seller to say which sheet this order uses. “Plexiglass to ISO 7823” without a part number is incomplete.
What to write instead
On the RFQ and the drawing, replace the nickname with four fields:
- Polymer: PMMA / acrylic.
- Route: cast or extruded.
- Thickness by member, and colorless or tint.
- Edge finish and joint method, if the part is a case or a stand.
You can add “also called plexiglass” in the email so a buyer and a factory are talking about the same thing. Do not leave it as the only material line.
Sanait builds custom acrylic displays, boxes, and trays — PMMA, in the sense above. A brief that says only “plexiglass” will be read as acrylic unless you say polycarbonate. Intake is on the FAQ. Scope is on the about page. Typical parts: boxes, trays, and stands.
FAQ
Are plexiglass and acrylic the same?
In common use, yes: both mean PMMA. Plexiglass is a trade name used as a generic. It is not a second plastic.
Is plexiglass a brand?
Yes. Plexiglas is a registered acrylic brand. Everyday writing often spells it plexiglass and means any acrylic sheet. A quote should still say whether the sheet is that brand or a generic PMMA.
Is Perspex the same as plexiglass?
Both are acrylic trade names. Same polymer family. Not automatically the same grade, thickness, or cast-versus-extruded route.
Is plexiglass the same as Lexan?
No. Lexan is polycarbonate. Plexiglass, in ordinary speech, is acrylic. Clear sheet is not enough to tell them apart on a photo.
Is plexiglass glass?
No. The name is a nickname. The material is PMMA plastic.
What should I put on the drawing?
Acrylic or PMMA, cast or extruded, thickness, and finish. Add “plexiglass” only as a plain-language note if your team uses that word.
Sources
Names below are identified from the polymer and from public reference entries. A trade name on a mill sheet is confirmed by that mill, not by this page.
- 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
- “Plexiglas.” Wikipedia. en.wikipedia.org
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