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        1. 材質應用

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          PTFE 材料表及參數

          作者: admin 時間:2017-09-04 來源: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
           

          材質應用

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