Fluoropolymeres - Basis of our Products
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Transcript of Fluoropolymeres - Basis of our Products
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Fluoropolymeres - Basis of our Products
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Fluoropolymeres
Material properties
Resistance to chemicals
Surface condition
Purity (Leaching)
Permeation
PTFE
TFM-PTFE
PFA
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Fluoropolymeres
Outstandig chemical stability
Service temperatures up to 260°C
Extremely anti-adhesive, smooth surface
Ultra-high purity
Superior electrical insulator
Hydro-phobic
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Fluoropolymeres - Material Properties
-[CH2-CF2]n-
-[CF2-CF2]n-
PP
PVDF
PTFE
TFM
PFA
Fluorine
Carbon
Oxygen
Fluorine
Carbon
Oxygen
Fluorine
PTFE
TFM
PFA
-CH2-CH n
-CH3
-
(CF2)2-CF- CF2 n
-(CF )2 2
O
CF3
-
(CF2) -CF- n
-(CF )2 2
O
CF3
4 5(CF2)
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Composition and Poperties of PTFE
Perfluorinated plastic with melting point of 327 °C, molecular weight approx. 108 g/mol
Complete protection of C-C-bonds by F-atoms
Processable by pressing, sintering and chip removing technics
Nearly universal resistance to chemicals
Service temperature: - 250 °C to + 250 °C
High purity, excellent dielectrical properties
No embrittlement, no aging
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Composition and Poperties of modified PTFE: TFM-PTFE
Molecular weight is about 1/5 of the molecular weight of PTFE
Contains the same perfluorinated modifier as PFA, but less than 1 %
Therefore TFM-PTFE closes the cap between classical PTFE and PFA
Weldable by special technics, thanks to the „shift versus thermoplastic properties“
Cold-flow, pore content and stretch-void-index are improved
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Composition and Poperties of PFA
Thermoplastic processable perfluorinated polymere
Molecular weight approx. 1 % of PTFE, therfore processable by fusion
4 to 10 % modifier
melting point: 305 to 290°C
Highly modified highly amorph: high transparency, improved alternate bending and good chemical resistance to stress crack
Chemical stability and service temperature comparable with PTFE
Processing methods: injection molding, extrusion, transfer molding
Thermoplastic processing technics open up new applications for this „material with PTFE-properties“
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Fluoropolymeres - Material Properties
PTFE TFM PFA PVDF
temperature range [°C] - 250 - 250 - 250 -60
to to to to
+ 250 + 250 + 250 + 150
persistence to chemicals very high very high very high high; reacts with
strong bases (NH3)
molecular weight ~ 108 g/mol 2 x 107 g/mol 106 g/mol
tensile strength 20 - 40 N/mm2 41 N/mm2 15 - 30 N/mm2 40 - 60 N/mm2
(ISO 12 086)
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Fluoropolymeres - Resistance to Chemicals
Chemical Effect
fluorinated hydrocarbons swelling, reversible at short-term exposition
alkali metals, dissolved or molten elimination of fluorine and polymere decomposition
halogenes, elemental fluorine, chloro trifluoride chem. reaction possible at elevated temperatures,
material decomposition, possibly violent reaction
nitrating acid (H2SO4 / HNO3) above 100°C slow material decomposition,
carbonisation
monomeres: styrene, butadiene, acrylnitrile ... could penetrate into the material; at spontanous
polymerisation: swelling or polymere decomposition.
popcorn-effect
high-energy radiation -radiation: dose of 10kGy could reduce the
mechanical properties by more than 50%
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Fluoropolymeres - Surface Condition
Chip removing productionwithout polishing
Injection molding
PTFE TFM PFA
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Fluoropolymeres - Purity (Leaching of Fluoropolymeres)
Extraction time: 2 daysMedium: 2% HNO3
Temperature: 20 °CResult: ng/cm2
PTFE TFM PFA-HP
Mg 2,58 1,40 1,18Al 3,73 2,20 5,00Li < 0,0002 < 0,0002 < 0,002B 0,085 0,091 < 0,01F 1173 1320 3522Na 18,10 10,00 5,38P < 4 < 4 < 5S 598 500 1164Cl 21 21 27K 18,40 10,00 5,32Ca 21,90 11,00 14,00Cr 0,085 0,10 0,19Mn 0,098 < 0,002 < 0,002Fe 5,04 3,10 2,97Ni 0,63 0,38 < 0,003Cu 21,4 24,3 0,049Zn 6,43 4,00 1,23Br 4 4 5Mo 0,31 0,061 < 0,001Pb 2,52 1,80 0,33
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0
5
10
15
20
25
30
35
40ppb
Na Al Mg Cu Cr Fe
2 % HNO
49 % HF
DI Wasser
3
36,037,0
< 2,9
< 1,5 < 0,9
9,5
5,7
13,0
< 1,5
3,8
< 0,6
9,0
4,8
n.d.*
14,5
6,07,2
1,44
Fluoropolymeres - Purity (Leaching of PTFE-TFM)
Conclusion:
Purity in accordance with specification for PFA-HP
lower concentrations of Cr, Ni, Mo than in PFA-HP
Conditions:
2 mm plate material
2% HNO3, 49% HF : 20 °C, 7 days
DI water 80°C, 7 days
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Fluoropolymeres - Permeation
0
500
1000
1500
2000
0 2000 4000 6000 8000 10000
PTFE
TFM
PFA
Per
mea
tion
in
Thickness in µm
cm³
m²·
day·
bar
Permeation of HCl-Gas at 100°C
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Permeation of water vapour at 100°C
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10,00
15,00
20,00
25,00
0 1000 2000 3000 4000 5000 6000 7000 8000 9000
PTFE
TFM
PFA
Thickness in µmPer
mea
tion
incm
³m
²·da
y·ba
rFluoropolymeres - Permeation
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Your Benefit
Hiogh competence through in house production
Customized solutions possible
PTFE and TFM-PTFE comparable with PFA
Solid, longevity PTFE-TFM-products (inserts, pressure vessels etc.)