PTFE Powder CGF-218
(for making seal tapes by paste extrusion)
Latest update: May 2006
- Molecular Formula: [CF2--CF2]n
- CAS No. 9002-84-0
Description
:
In addtion to
all excellent properties of PTFE material, CGF-218 series powders has outstanding
performance in paste extrusion to manufacture sealing tape, etc.. The resin are
processed by mixing them with some organic solvents to obtain paste which are made into coherent,
smooth and flat semifinished products after ram extrusion. Druing this progression the
extruding pressure remains steady .The semifinished products can be further processed to
produce unsintered tape by calendering, enlongating and removing solvent with heat, and
also to manufacture sintered coherent thin-walled tubing , continuous long rod, and
wire & cable coating, etc..
Typical
properties :
GRADE |
CGF-218H |
CGF-218K |
Bulk Density |
420 +/- 100 g/l |
Average Particles
Size |
750+/- 150 um |
| Moisture content |
max. 0.04% |
| Specific Gravity |
2.19
- 2.25 |
| Melting Point |
327
degree C |
Tensile Strength |
24 MPa |
23 MPa |
Elongation at break |
350 % |
300% |
| Heat Instability Index |
30
|
50
|
Main Applications |
Oil-free unsintered broad tape
for cutting apart |
| Tape width |
250mm
or more available |
Extrusion pressure |
20 +/- 5 MPa |
| Extrudate appearance |
flat, smooth and coherent |
Comparison
of the typical physical properties of the tapes (streching
ratio: 24:1, tape thickness 0.03 - 0.08 mm)
Seal
tape properties |
CGF-218H |
CGF-218K |
Whiteness |
Better
|
Good |
Clarity |
opaque
|
Slightly transparent |
| Tensile Strength |
15 MPa |
12 MPa |
Elongation at break |
30 % |
25% |
Typical
processing conditions for making seal tape:
- Liquid
Extrusion Aid: Aero Kerosene
- Mixing
ratio of the PTFE powder to the liquid extrusion aid: 100 g : 20.3 ~ 20.4 g .
- Temp. and time for
extrusion aid infiltration before extrusion : 8 ~ 10 hr. at 45 ~ 55 OC
- Ram extrusion temp.: 50OC
~ 60 OC
- Calendering temp. : 60 +
- 10 OC
- Oil removing temp. (for
drying) : 200 + - 10 OC
- Elongating temp. : 285 +
- 15 OC
Tape thickness : 0.060 + -
0.005 mm
Packaging,
storage and transportation
- 20kg net packed in double PE plastic bags
with a cardboard drum outside.
- Store in clean, cool ( preferably 5-20
degree C) and dry place
- Open containers and use the material in clean environment only.
 PTFE Powder CGF-206 for
narrower width tape (12mm, 15mm, 20mm, 25mm )
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