Acrylic

At a Glance

Process

Lead Time

Colors

Tolerance

Price

Applications

3 days (rush)
5-7 days (standard)
optically clear, opaque
ISO 2768
$
tanks, panels, and optical applications

About the Material

Acrylic is a scratch-resistant plastic, available optically clear or opaque. It is often used for tanks, panels, and optical applications.  It can be somewhat brittle in thin walled areas, so it is not recommended for delicate or complex geometries.

This plastic is also known as PMMA, an abbreviation of its full chemical name, polymethyl methacrylate, as well as by the trade names Plexiglas and Lucite.

Material Properties

Tensile Strength

Elongation at Break

Hardness

Density

Maximum
Temp

McMaster Part Number

8,000 PSI
6%
Rockwell M95
1.19 g/㎤
0.043 lbs / cu. in.
170° F

Material Finish

Design Recommendations

Min Wall Thickness

Min End Mill Size

Min Drill Size

Max Part Size

Undercuts

Radii : Depth

0.5 mm
0.8 mm
(0.03 in)
0.5 mm
(0.02 in)
1200 x 500 x 152 mm[(x,y,z] (mill) 
152 x 394 mm 
[d,h] (lathe)
Square profile, full radius, dovetail profiles
Depth must not exceed 12x drill bit diameter.
For end mills, depth must not exceed 10x drill bit diameter.

Cost Saving Tip

To reduce costs, limit the number of part setups, the number of inspection dimensions or tight tolerances, and deep pockets with small radii.

Related Resources

Engineer's Guide to CNC Machining for Prototyping Hardware
Fictiv CNC Material Datasheet