Introduction

POM (Polyoxymethylene) is an engineering thermoplastic with high impact and temperature resistance. Also known as acetal or Delrin, POM has excellent dimensional stability and high stiffness.

Applications: Pumps, gears, conveyor links, soap dispensers, fan blades, switches, buttons, knobs.

Behavior: POM demands consistent wall thickness to avoid shrink, and the material is not receptive to painting or coating. It can be machined with greater ease.

PropertiesMetricOther
Density1.01 – 1.20 g/cc0.0365 – 0.0434 lb/in³
Hardness68 – 11368 – 113
Tensile Strength (Yield)13.0 – 65.0 MPa1890 – 9430 psi
Tensile Strength (Ultimate)22.1 – 49.0 MPa3210 – 7110 psi
Elongation at Yield0.62 – 30 %0.62 – 30 %
Elongation at Break3.0 – 150 %3.0 – 150 %
Dielectric Strength18.0 – 50.0 kV/mm457 – 1270 kV/in
Melt Temperature180 – 274 °C356 – 525 °F

Design Guideline

Wall Thickness

Between 1 mm and 3 mm

Keeping walls as thin and constant as possible will reduce warping and sinking

Thickness gradient

Wall thickness should increase by no more than three times

Transition between thicknesses can be made smoother with fillets

Internal edges

Rounded, more than half wall thickness

Add fillet with largest possible radius

External edges

Rounded, full wall thickness plus internal fillet

Add fillet with largest possible radius

Draft angle

Increase draft by 1° for every 25 mm (for parts taller than 50 mm)

Add draft to ease ejection and avoid drag marks

Textured finish

Increase draft angle by 1-2°

Increase draft to ease ejection and avoid drag marks

Get Your Parts Into Production Today

Only 4 simple steps to complete your project. Follow the instruction and give it a try!

file upload icon

Upload Files

arrow down
quotation icon

Get Quotation

arrow up
place order icon

Place an Order

arrow down
start production

Start Production

Latest news and stories

Calculating Injection Molding Costs: The Tips and Facts You Need to Know
26 Jan

Calculating Injection Molding Costs: The Tips and Facts You Need to Know

Injection molding is one of the most popular manufacturing processes alongside CNC machining and 3D […]

Calculating CNC Machining Cost: All Factors and Tips You Must Know
25 Jan

Calculating CNC Machining Cost: All Factors and Tips You Must Know

CNC machining remains one of the most cost-effective methods for on-demand production to date despite […]

Types of Sheet Metals: How to Choose in Rapid Prototyping
24 Jan

Types of Sheet Metals: How to Choose in Rapid Prototyping

Sheet metals are an important component of many industrial processes. They are highly-valued materials resourcefully […]