[List of quality of material characteristics]
● Fluororesin
● Engineering plastic
ＰＥＥＫ、ＰＩ、ＰＰＳ、ＰＥＩ、ＰＰ、ＰＯＭ、ＰＶＣ

PTFE processed products

The processing of general parts are done by machine processing the molding material with a usual machine tool.
There are also processed parts that have been deformation processed. In terms of the machine processing of PTFE, it is necessary to understand the behavior of the PTFE before processing.
The following are points that need to be considered when machine processing:

(1) The thermal conductivity is small.
(2) The thermal expansion coefficient is large.
(3) There is a transition point in the room temperature that brings about a large volume change between the range of 19℃ and 23℃.
(4) There is elasticity.
(5) There are cases in which residual strain exists.

The shaping tolerance of PTFE (JIS K6884) is shown as reference.
Measurement condition: Measurement is conducted in the temperature after remaining still for 4 hours or more in a surrounding of 25±2℃.

Classification of nominal dimension		Allowable tolerance
		Class 1	Class 2
1 and over	16 or below	±0.1	±0.3
Above 16	40 or below	±0.2	±0.6
Above 40	63 or below	±0.3	±0.8
Above 63	100 or below	±0.4	±1.0
100Above	160 or below	±0.5	±1.2
160Above	250 or below	±0.6	±1.4
250Above	400 or below	±0.7	±1.7
400Above	630 or below	±1.0	±2.0
630Above	1000 or below	±1.5	±2.5

Symbol	Meaning and example of application	Maximum height target Rmax	Availability of processing
～	Molding surface, unprocessed	No particular designation	○
▽	Peeling, rough surface finish	50～100s	○
▽▽	Middle class (average) surface finish	12,5～25s	○
▽▽▽	Upper class surface finish	1.6～6.3s	Round bar and sleeve ○	Sheet ×
▽▽▽▽	Surface finish in mirror state	0.05s～0.8s	×