Transparent covers and visual models
Define the required fit, finish and working environment. Include the intended test or acceptance criteria with your model.
AIHFABS MATERIAL GUIDE
POM (Delrin / Acetal) CNC Machining
Engineering plastic for CNC
Low-friction gears, bushings, and precision plastic CNC parts that need dimensional stability without metal.
START WITH THE APPLICATION
Where this material family fits
Use the application to shortlist a grade, then confirm the exact requirements against the part design and operating conditions.
Bushings, guides and low-friction components
Define the required fit, finish and working environment. Include the intended test or acceptance criteria with your model.
Insulating parts and lightweight fixtures
Define the required fit, finish and working environment. Include the intended test or acceptance criteria with your model.
DESIGN & MANUFACTURING
What to review before selecting a grade
- Separate cosmetic transparency from mechanical requirements. Review the exact grade for contact, load and chemical exposure.
- Plan for thin walls, clamping and thermal expansion when specifying fits. Avoid transferring metal tolerances to plastics without review.
- Identify polished surfaces, sharp-edge requirements and tapped holes. Evaluate a sample where repeated assembly or appearance is critical.
CATALOG MATERIAL DETAILS
POM (Delrin / Acetal): process and finishing
- Manufacturing process
- CNC
- Catalog dimensional reference
- ±0.05 mm
- Grade / variant
- Engineering plastic for CNC
Catalog characteristics
- function
- durable
- smooth
- quick lead time
Finishing options to review
- Deburring
- Bead Blasting
- Tapping
- Polishing
These catalog details help you compare options. Confirm the exact material condition, feature tolerances and compatible finishing operations for your part before placing an order.
COMPARE THE AVAILABLE GRADES
Related materials in this family
CNC
Clear Acrylic (PMMA)
Optical-clarity covers, light pipes, display windows, and signage letters. Flame-polished or machined edges on request. Distinct from SLA clear resin.
View material details →
CNC
Colored / Frosted Acrylic
Brand-color logos, light-box faces, and privacy panels. Same routing workflow as clear acrylic with color-matched stock.
View material details →
CNC
Polycarbonate (PC)
Guards, covers, and machine windows that need toughness beyond acrylic. Can be left clear or tinted.
View material details →MATERIAL QUESTIONS
Frequently asked questions
What should I include when quoting POM (Delrin / Acetal)?
Send the current CAD, quantity and intended use. Add a drawing for critical fits, the required material condition and any finish or inspection requirements. Confirm availability and the delivered specification in the quotation.
Can I use catalog properties as acceptance criteria?
Use the catalog to shortlist a material. Ask for the exact grade data and agreed test conditions before specifying acceptance limits. Geometry, processing and finishing may affect the delivered part.
Can acrylic replace an engineering plastic?
Only after reviewing the actual function. Transparency, impact behavior, wear and temperature requirements may favor different materials.
Why do plastic parts need a separate tolerance review?
Material response, geometry, heat and workholding affect stability. Define functional datums and inspection conditions rather than tightening every dimension.
FROM THE AIHFABS BLOG
Recommended reading for material selection
Sla Design Guide For Printable Parts And Reliable Assembly
Design SLA parts for printing and assembly. Review walls, small features, tolerances, supports, hollow parts, and CAD files before requesting a quote.
Read article →SLA vs Other Manufacturing Processes: How to Choose
Compare SLA with DLP, LCD, FDM, SLS, MJF, SLM, and CNC machining. Shortlist processes by material, geometry, finish, cost, and your part's intended use.
Read article →How to Choose a 3D Printing Process for Cosmetic Prototype Parts
Learn how to choose the right 3D printing process for cosmetic prototype parts. Compare SLA, DLP, FDM, SLS, and MJF for surface quality, detail, fit, and finishing.
Read article →Compare other material families
Choose a material around your part
Upload CAD for a quote, or share the complete requirements for a material and manufacturing review.
