PEI machined components

Ultem/PEI Machining Overview

Ultem or PEI is a high performance plastic with high mechanical strength, high stiffness, and good machinability. This material could keep narrow tolerance. For the modified plastic, we have Ultem 2300 or PEI GF30(30% glass fiber filled), this type of material shows higher stiffness and relatively easy to machine.But all PEI plastic is prone to stress cracking, so special care should be taken in choosing a coolant.

Ultem/PEI Machining Guide

PEI Sawing
plastic sawing

Material 

Rotate Speed [rpm]

Circular Pitch

PEI Virgin

3000

20~24

PEI GF30

2400~2800

20~24

PEI Drilling

Material 

Number of Teeth

Helix Angle

Approach Angle

Cutting Speed

[rpm]

Feed Force

[mm/r]

PEI Virgin

Z2

25

90

20~80

0.1~0.3

PEI GF30

Z2

25

100

80~100

0.1~0.3

Note: Only for Keward Plastics. 

PEI Milling
plastic milling

Material 

Number of Teeth

Cutting Speed

[rpm]

Feed Force

[mm/r]

PEI Virgin

Z2~Z4

250~500

0.1~0.45

PEI GF30

Z2~Z4

80~150

0.05~0.4

PEI Turning

Material 


Relief Angle

Approach Angle

Corner

Cutting Speed

[rpm]

Feed Force

[mm/r]

PEI Virgin

10

0

45~60

350~400

0.1~0.3

PEI GF30

6~8

2~8

45~60

80~150

0.1~0.5

Note: Only for Keward Plastics. Easy to stress cracking, choose coolant carefully.