Plastic material guide
Acrylic CNC Machining Service
Acrylic (PMMA) is considered when transparency, rigidity and appearance matter. Cast and extruded stock, colour, optical quality and residual stress must be specified for the required finish.
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When Acrylic fits — and when to pause.
Transparent covers
Define viewing area, scratches and edge appearance.
Light guides or optical features
Use a named optical grade and measurable acceptance criteria.
Loaded or impact-prone parts
Compare polycarbonate or another material where impact dominates.
Use a complete material designation.
The following examples are common ways buyers describe the family. They are not a stock list and they do not authorise substitution.
- Cast PMMA sheet or block by supplier gradeConfirm supplier grade, condition, stock form and required documentation.
- Extruded PMMA by supplier gradeConfirm supplier grade, condition, stock form and required documentation.
- Optical or UV-stabilised grade when requiredConfirm supplier grade, condition, stock form and required documentation.
RFQ material line
Acrylic · PMMA grade, cast or extruded stock, colour · stock form · quantity · required certificates · permitted substitutions.
If an application approval matters, name the regulation, edition and acceptance evidence.
Plan machining around the material behaviour.
Stress and cracking
Control clamping, heat and sharp internal corners.
Optical faces
Protect surfaces and define which faces require polishing.
Assembly
Review fastener loads, solvent contact and edge distance.
Specify the final surface and dimensions.
Mechanical polishing
Identify faces and acceptable waviness.
Flame polishing
Use only where geometry, stress and end use permit.
As-machined edges
Define tool marks and chip-free edge criteria.
Separate material identity from dimensional inspection.
Purchase specification, supplier documents, lot traceability and an agreed identification or test method where appropriate.
Drawing, datums, critical characteristics, inspection conditions and the required report format.
Use the relevant tester only when the drawing defines the parameter, method, location and acceptance range.
Reference and quotation boundary.
External material reference: Röhm PLEXIGLAS technical information ↗
The source supports general material context. It does not establish Prolean stock, achievable tolerances, certification scope, price or delivery for a specific part. Those are confirmed in the quotation.
Technical review updated October 2026.
Acrylic machining questions.
How should Acrylic be specified for machining?
State the complete PMMA grade, cast or extruded stock, colour, the stock form, permitted substitutions and required documents. Add the drawing, quantity, finish and inspection requirements.
Does a listed grade mean it is stocked?
No. The examples help structure an RFQ. Availability, substitutions, price and delivery are confirmed for the project.
How are tolerances confirmed?
Tolerances depend on geometry, material condition, feature size, quantity, finishing and inspection conditions. Mark critical dimensions and datums; the quote confirms what can be held.
Can material documents and inspection reports be supplied?
State the required certificate, traceability and dimensional or test report with the RFQ. The available document set and test method are confirmed before production.
Bring the drawing and material into one review.
Send the CAD model or drawing, quantity, material designation, service conditions, finish and acceptance requirements.
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- MaterialComplete grade, condition, stock form and documents.
- PartCritical dimensions, datums, finish and inspection.
- ProjectQuantity and requested delivery date.