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.

Get a Free Quotation

Ultem/PEI Machining Guide

PEI 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

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.