TECASINT 2011 is unfilled, while TECASINT 2021 contains 15% graphite which offer improved wear resistance and a lower coefficient of friction. TECASINT 2000 series with their superior physical properties, are ideal for application in the aerospace, nuclear, automotive, electrical/electronics, and chemical processing industries. Improved sliding properties due to 15w% graphite. The electrical conductivity is also better comparing to the natural Tecasint 2011. Series of Tecasint 2000: have very high modulus, high rigidity, but compared to series of 1000 reduced moisture adsorption beside higher toughness and machining capability. Tecasint 2021, Vespel SP-21, Duratron PI D7015G Filler 15% Graphite Color Black Density (g/cm^3) 1.46 D 792 Mechanical. Property Value Typical ASTM Test; Modulus of Elasticity (Tensile Test) (psi) 638000.

2021

Ensinger’s Tecasint® family and DuPont’s Vespel® family of high-performance polyimide resins out perform most engineering thermoplastics in thermally aggressive bearing and seal applications. With or without lubrication these materials function over a wide range of temperatures and stresses while retaining outstanding creep strength, abrasion resistance, and compressive strength. Their superior thermal resistance allows them to carry loads at temperatures beyond the reach of most plastic materials and do so while exhibiting extremely low creep.

The extraordinary properties of Tecasint® and Vespel® make them the optimal choice for thermally aggressive applications in the automotive, off-road vehicle, jet engine and semiconductor manufacturing sectors. Polyimides do not become brittle, even at -400° F and have continuous service temperatures approaching 600° F. Close tolerance machining can be achieved with standard metal-working equipment with experience, however special techniques are employed to achieve extremely close tolerances and surface finishes less than 10 rms. Typical applications include sleeve and flanged bearings, rotary seal rings, wafer guides and carriers, insulators, valve seats, gaskets and thrust washers.

Grades

Tecasint 2021Tecasint 2021

Bearing Grade Polyimides most commonly used as bearing and wear components are;

Tecasint® 2021, Vespel® SP-21, where 15% graphite by weight is added to the base resin for increased wear resistance and reduced friction in applications such as bearings, thrust washes, bushings, seal rings, slide blocks and other wear surfaces. These have the highest mechanical properties of the graphite-filled grades.

Tecasint® 2031, Vespel® SP-22, where 40% graphite by weight is added to the base resin for enhanced resistance to wear and friction and good dimensional and oxidative stability. These have the lowest coefficient of thermal expansion of the graphite-filled grades.

Vespel® SP-211, where 10% Teflon (PTFE) and 15% graphite by weight are added to the base resin for the lowest coefficient of friction over a wide range of operating conditions. Vespel® SP-211 has excellent wear resistance up to 300° F.

Vespel® SP-3, where 15% molybdenum disulfide by weight is added to the base resin for bearing and wear components in vacuum and moisture-free environments.

Tecasint® is a registered trademark of Ensinger, Vespel® is a registered trademark of E.I. Dupont

Specifications for Tecasint® 2031 and Vespel® SP-22 (40% Graphite Filled Polyimide)TestValueUnits
Specific Gravity, 73°FD792 .0596Lb/in.3
Tensile Strength @ Yield, 73°FD638 9430psi
Tensile Modulus of Elasticity, 73°FD638psi
Tensile Elongation (at break), 73°FD638 2.2%
Flexural Strength, 73°FD790 12700psi
Flexural Modulus of ElasticityD790 755.2ksi
Shear Strength, 73°FD732psi
Compressive Strength – Ultimate 16,300psi
Compressive Strength at 2% DeformationD695 6,000psi
Compressive Strength at 10% DeformationD695 16,300psi
Deformation Under Load%
Compressive Modulus of Elasticity, 73°FD695 294 ksi
Compressive Strength ⊥ to Laminate (Modulus)psi
Compressive Strength ⊥ to Laminate (Yield)psi
Compressive Strength ⊥ to Laminate (Ultimate)psi
Hardness, Durometer (Shore “D” scale)D2240 84
Hardness, Rockwell (Scale as noted)D785Rockwell M
Izod Impact, Notched @ 73°FD256 Type A 1.57ft.lbs/in. of notch
Coefficient of Friction (Dry vs Steel) StaticPTM55007 .27
Coefficient of Friction (Dry vs Steel) DynamicPTM55007 .2
Maximum Static Bearing Load (P)PTM55007 6,000psi
Maximum Unlubricated No Load Bearing Velocity (V)PTM55007 1,000ft/minute
Maximum Limiting PV (Unlubricated)PTM55007 300,000psi x ft/min.
Wear Factor “K” x 10-10PTM55010Cubic in.-min/ft.lbs.hr
Sand Wheel Wear/Abrasion TestUHMW=100
Minimum Mating Surface HardnessRockwell (Brinnell)
Coefficient of Linear Thermal ExpansionE-831(TMA) 1.67in/in/°F x 10-5
Coefficient of Thermal Expansion // to LaminatesE-831(TMA) 1.67in/in/°F x 10-5
Coefficient of Thermal Expansion Perpendicular to LaminatesE-831(TMA) 1.67in/in/°F x 10-5
Softening Point°F
Heat Deflection Temperature 264 psiD648 613°F
Embrittlement Temperature <400°F Min.
Continuous Service Temperature in Air 572°F Max.
Short Term Service Temperature 600°F Max.
Tg-Glass Transition (Amorphous)D3418 698°F
Melting Point (Crystalline Peak)D3418 N/A°F
Thermal ConductivityF433 12.0BTU-in/(hr/ft2°F)
Dielectric Strength Short TermD149Volts/mil
Volume ResistivityD257 1012-1013ohm/cm
Surface ResistivityD257ohm/cm
Dielectric Constant, 106 HzD150
Dissipation Factor, 106 HzD150
Flammability @ 3.1mm(1/8 in.) UL94UL94 V-0
Arc Resistanceseconds
Water Absorption, Immersion 24 HoursD570 (2) 1.2%
Water Absorption, Immersion SaturationD570 (2) 2.1%
Machinability Rating 51=easy, 10=difficult
Rod Diameter Availability (Call for Availability)1 3inches
Sheet Thickness Availability (Call for Availability).25 2inches

Tecasint 2021 Mercedes

Characteristics / AttributesSuperior Temperature & Chemical Resistance, Highest PV Rating, Excellent Bearing and Wear Properties, High Cost