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PTFE 材料表及参数

作者: admin 时间:2017-09-04 来源:未知
摘要:CONSISTS OF DEFINITION OF FILL 5% Glass Fiber 10% Glass Fiber 15% Glass Fiber 20% Glass Fiber 25% Glass Fiber 30% Glass Fiber Milled glass fibers have the least effect on chemical and electrical properties and add greatly to the mechanical...

CONSISTS OF DEFINITION OF FILL
5% Glass Fiber
10% Glass Fiber
15% Glass Fiber
20% Glass Fiber
25% Glass Fiber
30% Glass Fiber
 
Milled glass fibers have the least effect on chemical and electrical properties and add greatly to the mechanical properties of unfilled PTFE. Addition of glass improves compressive properties by as much as 40% and improves wear resistance greatly. These compounds resist acids and oxidation but can be attacked by alkali.
 
30% Graphite
5% Graphite
10% Graphite
15% Graphite
20% Graphite
25% Graphite
 
Graphite has good chemical resistance to corrosive environments and exhibits good initial wear and rubbing/sliding characteristics in dry and water applications. Commonly blended with carbon and PTFE.
 
25% Bronze
40% Bronze
60% Bronze
This filler has better wear, creep resistance, and higher thermal conductivity than glass fiber with PTFE. The compound is easily machined, but has poor chemical resistance in the presence of acids and alkali. Useful in applications which undergo high mechanical loads or high-speed rubbing contacts where the bronze filler supplies the strength and conductivity to carry away excess, unwanted heat.
 
5% Molybdenum Disulfide This filler is used frequently in combination with others to increase surface hardness, stiffness, and to reduce the starting coefficient of friction and steady-state wear. Its effect on electrical and chemical properties is negligible.
 
5% Carbon
10% Carbon
15% Carbon
20% Carbon
25% Carbon
33% Carbon
Carbon has good chemical resistance to corrosive environments. It exhibits good initial wear and rubbing or sliding contact characteristics, both dry and water applications. It is frequently used in piston rings to reduce cylinder wall wear by entrapping abrasive foreign particles in their relatively soft surfaces.
 
10% Carbon-Graphite
20% Carbon-Graphite
25% Carbon Graphite
These fillers are used both separately and together in PTFE compounds.
 
5% Calcium Fluoride
10% Calcium Fluoride
15% Calcium Fluoride
ALTERNATIVE TO GLASS FILL.
 
15% Glass Fiber, 5% Moly
20% Glass Fiber, 5% Moly
5% Carbon-Graphite
23% Glass Fiber, 2% Moly
25% Glass Fiber, 5% Moly
SEE ABOVE FOR INDIVIDUAL DEFINITIONS.
 
10% Glass Fiber, 10% Graphite
5% Glass Fiber, 5% Graphite
20% Glass Fiber, 5% Graphite
SEE ABOVE FOR INDIVIDUAL DEFINITIONS.
 
10% Glass Fiber, 5% Carbon
5% Glass Fiber, 10% Carbon
SEE ABOVE FOR INDIVIDUAL DEFINITIONS.
 
40% Bronze, 5% Moly
40% Bronze, 10% Moly
55% Bronze, 5% Moly
65% Bronze, 5% Moly
SEE ABOVE FOR INDIVIDUAL DEFINITIONS.
 
TYPICAL PHYSICAL PROPERTIES OF VIRGIN PTFE PRODUCTS
 PTFE Material Virgin Virgin
"Super"
PTFE
Reprocessed Virgin PTFE blended with:
Filler None None None Glass Fiber Bronze Graphite Carbon Glass,
MoS2
Filler Content By Weight 0% 0% 0% 25% 40% 10% 10% 23%, 2%
PROPERTIES
Specific Gravity 2.16 2.16 2.16 2.22 3.30 2.13 2.13 2.25
Tensile Strength @ Break (PSI) 3,000 4,500 1,500 2,500 2,300 2,700 2,800 2,500
Elongation @ Break 200% 800% 75% 50% 60% 60% 50% 50%
Shore D Hardness 54 54 56 63 65 57 62 64
Dielectric (Volts/Mil) 1300 2100 600 - - - - -
 
Mechanical Properties
Property ASTM Standard Unit Teflon® PTFE Teflon® FEP Teflon® PFA Teflon® ETFE
Specific Gravity D792 -- 2.15 2.15 2.15 1.76
Tensile Strength D1457
D1708
D638
MPa
(psi)
21-34
(3,000-5,000)
23
(3,400)
25
(3,600)
40-46
(5,800-6,700)
Elongation D1457
D1708
D638
% 300-500 325 300 150-300
Flexural Modulus D790 MPa
(psi)
496
(72,000)
586
(85,000)
586
(85,000)
1,172
(170,000)
Folding Endurance D2176 (MIT)
cycles
>106 5-80 x 103 10-500 x 103 10-27 x 103
Impact Strength D256 J/m
(ft·lb/in)
189
(3.5)
No Break No Break No Break
Hardness D2240 Shore D pencil 50-65 HB 56
HB
60 72
Coefficient of Friction, Dynamic D1894 -- 0.05-0.10 0.08-0.3 -- 0.3-0.4
 
Thermal Properties
Property ASTM Standard Unit Teflon®
PTFE
Teflon® FEP Teflon® PFA Teflon® ETFE
Melting Point D3418 °C
(°F)
327
(621)
260
(500)
306
(582)
267
(512)
Cure
Temperature
-- °C
(°F)
379-429
(715-805)
360-385
(680-725)
379-399
(715-750)
302-323
(575-615)
Flame Rating* UL94 -- V0 V0 V0 V0
Limiting Oxygen Index D2863 % >95 >95 >95 30-36
Heat of Combustion D240 MJ/kg
(Btu/lb)
5.1
(2,200)
5.1
(2,200)
5.3
(2,300)
13.7
(5,900)
* Statements regarding behavior in a flame situation are not intended to reflect hazards presented by this or any other material when under actual fire conditions.
Chemical Properties
Property ASTM Standard Unit Teflon®
PTFE
Teflon®
FEP
Teflon®
PFA
Teflon®
ETFE
Chemical/Solvent Resistance D543 -- Excellent Excellent Excellent Excellent
Water Absorption, 24 h D570 % <0.01 <0.01 <0.03 <0.03
Salt Spray Resistance (1)
-on aluminum
-on steel
B-117
Hours
Hours

744+
192

744+
--

1000
--

1000
--
Detergent Resistance (2)
-on aluminum
-on grit-blasted aluminum
-on grit-blasted steel
--
Hours
Hours
Hours

264
624
24

744
600
480

--
--
--

--
--
--
Weather Resistance Florida Exposure Years Unaffected 20 20 10 15
Notes:
1. Salt Spray Resistance: 5% NaCl at 35°C/95°F, hours to failure
2. Detergent Resistance: hours to failure
Electrical Properties
Property ASTM Standard Unit Teflon®
PTFE
Teflon® FEP Teflon® PFA Teflon® ETFE
Dielectric Constant D150 1 MHz 2.1 2.1 2.1 2.6
Dielectic Strength* D149 V/µm 18 53 80 79
Dissipation Factor D150 1 MHz <0.0001 0.0006 0.0001 0.007
Arc Resistance D495 sec >300 300 >180 122
Volume Resistivity D257 ohm·cm >1018 >1018 >1018 >1017
Surface Resistivity D257 ohm/sq >1018 >1016 >1017 >1015
* Dielectric Strength: 100 micrometers film
Vapor Transmission Rates
Vapor Transmission Rates of Teflon® FEP Film, 25 µm (1 mil) thickness/per ASTM E-96 (modified)
Values measured on thicker specimens and converted to 25 µm (1 mil)
Vapor Temperature, °C g/100 sq in. or g/625 sq cm (24 hr)
Acetic Acid 35 0.41
Acetone 35 0.95
Acetophenone 25 0.50
Benzene 35 0.64
Carbon Tetrachloride 35 0.31
Etyl Acetate 35 0.76
Hexane 35 0.56
Hydrochloric Acid, 20% 25 <0.01
Piperidine 25 0.04
Red Fuming Nitric Acid 25 7.5-1.4
Sodium Hydroxide, 50% 25 <0.01
Sulfuric Acid, 98% 25 0.00001
Water 39.5 0.40
 

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