For the production of porous rods, tubes and tiles, PTFE particles are melted together.
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The pore size can be determined both by the selection of the PTFE granules and the process parameters.
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Due to the non-adhesive surface, filtering devices made of fluoroplastics (PTFE/PFA) are easy to clean and have a long durability.
Microporous PTFE has the same unique properties like “normal” PTFE:
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PTFE
Porous PTFE
Furthermore, using a combination of specially developed starting raw materials and taking advantage of the up-to-date technologies and know how, Flontech is able to supply different grades of porous PTFE powders, characterized by controlled pore size and distribution, permeability and water intrusion pressure (WIP). Flontech technical assistance can give the best support in the designing of the final required characteristics and can offer tailor-made specific porous powders upon request.
Typically applied in chemical, semiconductor, automotive and packaging industry and in the field of filters and sensor (lamda sensor, headlights, injection control, airbag…), where the porous PTFE features are ideal for hostile environments.
Porous PTFE is mainly used for the production of filters (dust and water purification filters as well as precision filters for medical/clinical and life science applications ), optical parts (reflectors, spectrometers, photometers), acoustic / sound dampening components (wind screens for microphones, air regulator for speakers) and electrical / electronic insulating items.
Porous PTFE represents a competitive alternative to the expanded e-PTFE and it is characterized by the following main properties:
- Air flow rates: up to 20 l/hr/cm² at 20 mbar
- Water intrusion pressure (WIP): up to 1,2 bar
- Average pore diameter: up to 50 μm
Main Typical Properties of Flontech porous PTFE
Typical Properties\ Grade
Test
Method
Units
FT-POR-2
FT-POR-5
FT-POR-10
FT-POR-125
General
Porosity
degree
-
-
Very high
porosity
High porosity
Medium porosity
Low porosity
Physical & mechanical
Bulk density
ASTM
D
g/L
750
730
710
690
Specific gravity
INTERNAL
g/cm3
1,35
1,40
1,50
1,70
Tensile strength (CD)
ASTM
D
MPa
4,0
5,0
6,0
8,0
Elongation at break (CD)
ASTM
D
%
40
50
60
80
Porosimetric
Water
intrusion pressure (P H2O)
INTERNAL
bar
0,20
0,30
0,40
0,55
Air Flow (ΔP 10 mbar)
ASTM
D737
l/hr.cm²
2,20
1,70
0,70
0,40
Air Flow
(ΔP 20 mbar)
ASTM D737
l/hr.cm²
4,30
3,50
1,40
0,80
Accessible
porosity
INTERNAL
%
37,0
32,0
27,0
25,0
Total
pore volume
INTERNAL
/g
280,0
210,0
180,0
160,0
Average pore radius
INTERNAL
µm
5,0
4,0
3,0
2,5
CD: cross direction
Specific grades are available upon request.
(1) determined on a disk of 47x1 mm
Reference:
The mechanical properties have been evaluated from a 50x50 mm rod. moulded at 30 Mpa and sintered with a total time cycle of 15 hrs, with 2 hrs and 40 min at max temperature of 370°C