Vespel® SCP-5050

Vespel® SCP-5050

Vespel® S polyimide family of parts and shapes with differing sets of attributes The Vespel® S Family of products are highly durable polyimides and are used in demanding applications where exceptional thermal resistance, low wear and/or low friction, strength and impact resistance are desired.

DuPont™ Vespel® SCP-5050 parts and shapes improve high temperature performance and wear resistance to allow for the replacement of metal and graphite parts. Vespel® SCP-5050 parts and shapes enable more efficient and durable systems, increased performance and reduced maintenance costs. SCP-5050 has a Coefficient of Thermal Expansion (CTE) similar to steel.

Applications
  • A shroud is a segmented ring with holes drilled radially outward for variable vane stems used inside a jet engine compressor. Some are split.
  • For seals, insulators and more An unfilled grade in the SCP series, Vespel® SCP-5000 uses the same base polyimide as SCP-5050. It delivers major benefits in applications such as insulators requiring dielectric properties or seals and valve seats needing enhanced high-temperature performance and chemical compatibility. To learn more, please visit vespel.dupont.com or contact the nearest DuPont location listed here.
  • Grooves are cut into shroud to accept metal connecting ring, frequently with an abradable seal.
  • Inner shrouds typically float on the engine axis.
  • Jet engines Leading global manufacturers use Vespel® SCP-5050 parts in engine applications, upgrading the wear performance of traditional polyimide parts and replacing metal parts in high temperature environments where traditional polyimides have not been used because of previous temperature limitations. Typical applications include wear pads and strips, thrust washers, bushings, bearings, bumpers and more.
  • Other aerospace uses The outstanding wear performance of Vespel® SCP parts can also provide benefits where temperatures are less severe than within the engines.
  • Other industries Vespel® SCP-5050 parts are delivering cost and performance benefits in vehicles, as well as industrial equipment requiring higher temperature capabilities, wear resistance and dimensional stability than traditional polyimides and metal bearings. In glass manufacturing, SCP-5050 exhibits lower conductivity and oil absorption while offering higher impact resistance than graphite components.
  • Shrouds are typically aluminum, stainless steel, or titanium.
  • Shrouds utilize bushings to enhance wear and reduce friction for variable vane stems.
Special Warnings
  • Components need to withstand thermal excursions for duration of expected engine life.
  • Damage can occur to expensive metal components such as vanes if bushings wear out prematurely
  • Shrouds need to be designed to allow simultaneous assembly with multiple vanes.
  • Shrouds need to withstand impact, loading, and maintain relative location of vanes.
Solutions
  • Design shrouds in light weight, high temperature, wear resistant Vespel® SCP-5050 composite material instead of metal.
 
 
 

Features & benefits

Stiff when Hot
  • Stiff when Hot
    		•
    Stiff when hot
  • Stiff when hot
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    Lower system cost through part consolidation.
  • Lower system cost through part consolidation.
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    Proven impact resistance.
  • Proven impact resistance.
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    Potential weight savings of 40% over aluminum and 75% over stainless steel and titanium due to lower density of composite materials.
  • Potential weight savings of 40% over aluminum and 75% over stainless steel and titanium due to lower density of composite materials.
    		•
    Extended part life
  • Vespel® SCP-5050 parts have superior thermal oxidative stability and wear resistance at elevated temperature and can last longer than traditional polyimides in high temperature wear environments.
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    Lighter weight
  • Vespel® SCP-5050 parts allow you to save weight by replacing metal in more high temperature environments. They are much stiffer than traditional filled polyimides at elevated temperature. Their low coefficient of thermal expansion allows closer fits and easier-to-manage tolerance stackups for your designs. The CTE of SCP-5050 parts is a near match for that of stainless steel.
    		•
    More hot wear resistance
  • More hot wear resistance
    		•
    Fewer parts to stock and assemble through bushing elimination.
  • Fewer parts to stock and assemble through bushing elimination.
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    Superior heat stability
  • Superior heat stability
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    Lower friction vs. metal with dynamic coefficient of .2 or less.
  • Lower friction vs. metal with dynamic coefficient of .2 or less.
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    More Hot Wear Resistance
  • More Hot Wear Resistance
    		•
    Vibration dampening properties of composites versus metals.
  • Vibration dampening properties of composites versus metals.
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    Provide largest subassembly possible.
  • Provide largest subassembly possible.
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    Metal-like dimensional stability
  • Metal-like dimensional stability
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    Reduced costs
  • Replacing metal with Vespel® SCP-5050 parts can save on both initial and lifetime costs. • Lower initial cost than hard-faced or specially treated metallic for parts like bushings. • Less wear on mating high-value components—jet engine stators for example—can sharply cut maintenance costs.
    		•
    High temperature material capabilities in application environments in excess of 600 °F/315 °C.
  • High temperature material capabilities in application environments in excess of 600 °F/315 °C.
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    Longer component life due to reduced wear interfaces, utilization of bearing material for entire shroud, and elimination of bushing life issues.
  • Longer component life due to reduced wear interfaces, utilization of bearing material for entire shroud, and elimination of bushing life issues.
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    Available Sizes

    Gross Weight Net Weight Carton Each Carton Length Carton Weight Carton Height
    0 0 0
    0 0 0
    0 0 0
     
     
     

    Electrical Property

    Property Value Unit Method
    Surface Resistivity Volume Resistivity Dielectric Strength ASTM D-257 Ohm/sq Ohm·cm (Ohm·in) Volt/m (Volt/in) 4.1 x 105 9.4 x 107 (3.7 x 107) Conductive
    Dielectric Constant, 102 Hz 104 Hz 106 Hz ASTM D-150 — 21.1 20.6 19.1
    Dissipation Factor, 102 Hz 104 Hz 106 Hz ASTM D-150 — 0.0075 0.0112 0.0165

    Other Property

    Property Value Unit Method
    Water Absorption after 24 hr ASTM D-570 % weight change 0.04
    Specific Gravity ASTM D-792 — 1.76

    Thermal Property

    Property Value Unit Method
    Coefficient of Thermal Expansion parallel Z perpendicular X-Y ASTM E-831 m/m·°C (in/in·°F) 51 x 10–6 (29 x 10–6) 16 x 10–6 (9 x 10–6)
    Specific Heat ASTM E-1269 J/kg°C (Btu/lb°F) 887 (0.212) 920 (0.22)
    Coefficient of Thermal Expansion ASTM E-831 m/m·°C or m/m·K (in/in·°F) 29 x 10–6 (16 x 10–6)
    Thermal Conductivity ASTM F-433 W/mK (Btu/hr in °F) 1.65 (0.08) 1.78 (0.09) 1.38 (0.07)

    Wear Property

    Property Value Unit Method
    Coefficient of Friction, Unlubricated, Air 25K PV 100K PV Falex — 0.20 0.08
    Wear Factor, Unlubricated, Air 25K PV 100K PV Falex mm-sec/MPa-m-hr (in3-min/ft-lb-hr) 4.0 x 10–3 (55 x 10–10) 1.9 x 10–3 (26 x 10–10)
    Water Absorption ASTM D-570 % weight change 0.07

    Mechanical Property

    Property Value Unit Method
    Compressive Strain, Ultimate ASTM D-695 % 13 27
    Deformation Under Load, 10 min 24 hr ASTM D-621 % deformation 0.00 0.04
    Compressive Modulus ASTM D-695 MPa (kpsi) 2,997 (435) 3,138 (455)
    Deformation Under Load 24 hr, 14 MPa (2 kpsi) ASTM D-621 % deformation 0.03
    Compressive Strength ASTM D-695 MPa (kpsi) 154 (22) 106 (15) 219 (32) 240 (35)
    Compressive Creep, 10 hr 100 hr 1000 hr ASTM D-2990 % 0.05 0.07 0.09
    Flexural Modulus ASTM D-790 MPa (kpsi) 7820 (1130) 5270 (764) 7,800 (1,130) 5,080 (740)
    Tensile Elongation ASTM D-638 E-8 Specimen ASTM D-638 D-1708 Specimen % 2.3 3.1 2.5 5.3
    Compressive Stress at 10% Strain ASTM D-695 MPa (kpsi) 156 (23) 73 (11) 172 (25.0) 184 (26.7)
    Flexural Strength ASTM D-790 MPa (kpsi) 120 (17) 73 (11) 130 (19) 73 (11)
    Young’s Modulus ASTM D-638 E-8 Specimen ASTM D-638 D-1708 Specimen MPa (kpsi) 9590 (1390) 3860 (561) 8,928 (1,295) 2,931 (425)
    Tensile Strength ASTM D-638 E-8 Specimen ASTM D-638 D-1708 Specimen MPa (kpsi) 79 (11.5) 41 (6.0) 72 (10.5) 38 (5.6)
    Rockwell “E” Hardness ASTM D-785 — 12 63
    Poisson’s Ratio ASTM D-638 — 0.22 0.23
     
     
     
    Product Details

    Fabric/material

    SCP SHROUDS (TRILOK CG)

    Design

    SHROUDS

    Seam

    SCP (PI)

    Packaging

    SHROUD SEGMENT, STAINLESS

    Hazard

    Coated Material

    ASB (TRILOK CG) PARTS

    Features

    DF2 ISO
     
     
     
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