PTFE Powder CGF-218

Productname:PTFE Powder CGF-218

Details

PTFE Powder CGF-218
(for making seal tapes by paste extrusion)

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:
1. Liquid Extrusion Aid: Aero Kerosene
2. Mixing ratio of the PTFE powder to the liquid extrusion aid: 100 g :  20.3 ~ 20.4 g .
3. Temp. and time for extrusion aid infiltration  before extrusion :  8 ~ 10 hr. at 45 ~ 55 OC
4. Ram extrusion temp.: 50OC ~ 60 OC
5. Calendering temp. : 60 + - 10 OC
6. Oil removing temp. (for drying) : 200 + - 10 OC
7. Elongating temp. : 285 + - 15 OC
8. 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.