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【】 Properties 【】
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【】 Properties 【】
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♦ PTFE Properties
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PTFE Properties |
ATM
Method |
Units |
Virgin PTFE |
Reprocessed
PTFE |
25% Glass
PTFE |
|
Specific Gravity
|
D792 |
|
2.14-2.20 |
2.15-2.20 |
220-230 |
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Tensile Strength
|
D638 |
PSI |
1500-3500 |
1500-2400 |
2000-3000 |
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Tensile Strength
|
D638 |
PSI |
1500-3500 |
1500-2400 |
2000-3000 |
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Elongation
|
D638 |
%
|
250-350 |
75-200 |
100-260 |
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Hardness
|
D1700 |
Durometer "D" |
50-60 |
N/A
|
55-65 |
|
Deformation %
73 0 F, 1500 psi, 24 hours |
D621 |
N/A
|
4-8 |
N/A
|
1.73 |
|
Deformation %
100 0 F, 1500 psi, 24 hours |
D621 |
N/A
|
10-18 |
N/A
|
1.91 |
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Deformation %
200 0 F, 1500 psi, 24 hours |
D621 |
N/A
|
20-25 |
N/A
|
4.57 |
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Impact Strength,
Izod
730 0 F Average
170 0 F Average |
D256 |
Ft./Lb./In. |
3.00
6.00 |
N/A
|
2.54
3.69 |
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Water Absorption
|
D570 |
%
|
0.001 |
N/A
|
0.013 |
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Coefficient of
Friction
(Static) 73 0 F |
*3 |
N/A
|
0.04 |
N/A
|
0.085 |
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Dielectric
Constant
(100 CPS) |
D150 |
N/A
|
2.00 |
2.26 |
2.4 |
|
Dielectric
Strength (4) (air) |
D257 |
Volts |
1000 |
450 |
235 |
|
Coefficient of
Thermal Expansion 73 0 F |
D696 |
In./In./Ft. |
5.5 x 10.3 |
N/A
|
2.75 x 10.3 |
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Coefficient of
Thermal Conductivity |
*5 |
Btu/hr/ftz |
1.7 |
N/A
|
3.12 |
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PV at 900
ft./min |
N/A
|
N/A
|
2500 |
N/A
|
15,000 |
|
Color
|
*6 |
N/A
|
white |
off white |
brownish white |
|
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♦ PTFE
and Teflon History
Polytetrafluoroethylene (PTFE) resin is in a class of paraffinic
polymers that have some or all of the hydrogen replaced by
fluoride. The original PTFE resin was first discovered on April
6, 1938 by Dr Roy J. Plunkett. While working at DuPont's Jackson
Laboratory in New Jersey on another project, Dr. Plunkett found
that a frozen, compressed amount of tetrafluoroethylene gas had
polymerized into a waxy white solid substance, forming
polytetrafluoroethylene (PTFE). DuPont registered the original
PTFE resin under the trademark Teflon® in 1945, and the first
commercial products were sold under this trademark in 1946.
Interestingly, PTFE was produced on a limited scale in the early
1940s, and was used shortly thereafter by the Manhattan Project
in containers for highly corrosive elements during uranium
separation experiments.
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♦ PTFE Characteristics &
Benefits
The extraordinary characteristics of
PTFE make it the ideal choice in a wide range of products and
applications. PTFE has a coefficient of friction that is one of
the lowest of any material. PTFE is extremely abrasion
resistant, making it adaptable to the harshest environments. In
addition, PTFE can withstand a wide range of temperatures, from
260 Degrees Centigrade down to -270 Degrees Centigrade, and can
even handle brief exposures at higher temperatures. PTFE also
has excellent flame resistance due to its extremely high melting
point, along with a very low rate of smoke generation and heat
release. Another advantage of PTFE is that it is chemically
inert and pure, and has no additional stabilizers, lubricants or
plasticizers that would taint process fluids.
PTFE products have an extremely long
service life, primarily due to PTFE retaining its original
properties over a long period of time, even at extreme
temperatures, in ultraviolet (UV) light, and when exposed to
oils, oxidizing agents and solvents. PTFE also is extremely
corrosion resistant, especially to acids, and harsh inorganic
and organic chemicals. Additionally, the original properties
PTFE remain the same even after extended time periods in water.
Furthermore, PTFE is resistant to atmospheric aging in the form
of discoloration, oxidation, and, as previously noted, is not
affected by ultraviolet light
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【】 Properties 【】
