PPS Machining Overview

PPS is a high temperature plastic. It shows good chemical resistance, high mechanical strength, good machinability, and great dimensional stability. Besides PPS Virgin, another very common PPS plastic is PPS GF40(PPS 40% glass fiber reinforced). PPS GF40 has very high percentage glass fiber, thus makes the material stiff and easy to crack. So for machining PSS GF40, the material should be pre-heated before any process.

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PPS Machining Guide

PPS Sawing

Material	Rotate Speed [rpm]	Circular Pitch
PPS Virgin	3000	20~24
PPS GF40	2400~2800	20~24

PPS Drilling

Material	Number of Teeth	Helix Angle	Approach Angle	Cutting Speed [rpm]	Feed Force [mm/r]
PPS Virgin	Z2	25	90	50~200	0.1~0.3
PPS GF40	Z2	25	100	80~100	0.1~0.3

Note: Only for Keward Plastics. Fro PPS GF40, when the diameter is larger than 60mm, the material should be pre-heated.

PPS Milling

Material	Number of Teeth	Cutting Speed [rpm]	Feed Force [mm/r]
PPS Virgin	Z2~Z4	250~500	0.1~0.45
PPS GF40	Z2~Z4	80~150	0.05~0.4

PPS Turning

Material	Relief Angle	Approach Angle	Corner	Cutting Speed [rpm]	Feed Force [mm/r]
PPS Virgin	6	0~5	45~60	250~500	0.1~0.5
PPS GF40	6~8	2~8	45~60	80~150	0.1~0.5

Note: Only for Keward Plastics.

PPS Heat Treatment

Material	Heating	Keeping	Cooling
PPS	3h heating to 120℃, then 4h heating to 220℃	1.5h/10mm thickness	cooling to 40℃ at speed of 20℃/h

Note: Only for Keward Plastics. The heat treatment above is a rough numbers, and only suit for the components which the thickness is less than 50mm. If the thickness is larger than 50mm, Please Send Us Email.