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POLYFLON PTFE
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The M-390 series of POLYFLON PTFE is manufactured using the latest in granulation technology, resulting in improved powder flow properties over conventional free flow-type products such as the M-30 series. Smaller particle diameters, narrow particle size distribution and excellent electrostatic characteristics all combine to provide a dramatic improvement in molding and processing performance for this product series.
The surfaces of the molded articles produced are extremely smooth, and three different grades (M-391, M-392 and M-393) are available to cater to different requirements such as the molding method to be used and the desired shape of the molded articles.


The M-390 series of POLYFLON PTFE has a greater apparent density than conventional free flow-types such as M-33. The new series also has a smaller particle diameter, more narrow particle size distribution and low electrostatic characteristics, which result in improved particle flow characteristics. This allows the material to flow more easily into molds during automatic and semi-automatic molding processes.
Furthermore, the surfaces of the molded articles produced are extremely smooth.

Grade Main features
M-392 ・ Good fill characteristics particularly into narrow gaps, making it ideal for molding of thin sleeves and for isostatic molding.
・ The surfaces of molded articles are particularly smooth, so that no surface planning is needed and it can be used for sheet molding.
M-393 ・ Maximum emphasis given to ease of handling during molding.
・ Used when molded article height is required.
M-391 ・Used if there are concerns about insufficient molding pressure for flat sheets.
Particle shape
M-33 (conventional PTFE)
M-392

Particle size distribution
Powder and molded article properties

Properties of M-390 series
Properties Units Test method Measure-
ment conditions		 M33 M391 M392 M393
Powder Apparent density g/ml According to
JIS K 6891
0.83 0.78 0.86 0.93
Average particle diameter μm According to
JIS K 6891
300 550 400 500
Particle
size distribution
*1
 mass DK method
50 70 70 70
Flow character-istics DK method
Good Good Exce-llent Exce-llent
Molded articles Specific gravity According
to ASTM D
4894
2.16 2.16 2.16 2.16
Tensile strength MPa According to JIS K 6891
41 43 40 36
Elongation According to JIS K 6891
350 380 350 330
Dielectric breakdown voltage kV/
0.1mm		 According to JIS K 6891
6.5 8.0 6.0 3.0
Shrinkage
*2
 DK method Preform
test
piece size
50mmX
20mX
5mmt		 3.0 3.2 3.2 3.0
Surface roughness ﾊm
Free-
baked
article surface Average median roughness Ra 		1.9-2.4 1.9-2.5 2.1-2.7 2.4-3.2
Hardness Shore Durometer
D60 D60 D60 D60
Compre-ssion
strength		 MPa According to ASTMD 695 0.2 off set 7.6 7.7 7.3 6.9
1defor-mation 4.7 4.5 4.7 4.4
25defor-mation 28 27 27 26
Total deformation According to ASTMD 621 6.9MPa,
100,4hr		 12.4 12.0 12.0 12.7
13.7MPa,
24,4hr		 16.6 16.1 15.5 17.5
Permanent deformation According to ASTMD 621 6.9MPai,
100,4hr		 4.1 4.6 4.4 5.0
13.7MPa,
24,4hr		 7.6 8.0 7.3 7.9
Powder and molded article properties
*Particle size distribution: Mass % comprising (0.7 ~1.3 times) average particle diameter
*Shrinkage: Percent change after sintering with respect to the metal die diameter .
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