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The Plastics Today for the Technologies of Tomorrow

Performance Plastics Overview

The group of plastics within this section have been assigned the collective title of Performance Plastics. Included within this section are: Hydlar Z, Kevlar fiber reinforced Nylon 6/6; Kapton, polyimide film; PEEK, polyetheretherketone; Polysulfone; Ryton, polyphenyl sulfide; Torlon polyamideimide; Ultem 1000, polyetherimide high heat polymer; and Vespel, high-performance polyimide.

The Performance Plastics group generally exhibits better thermal stability at high temperatures than other plastics. They are also more flame retardant as well. These plastics also have unique properties that make them well suited to a number of specific, specialized applications. For example, both Envex and Vespel are specified for their low vacuum outgas characteristics. PEEK and Ultem 1000 are used successfully in applications where low smoke is a consideration.

Occasionally, within this group, inorganic fillers are added to increase creep resistance and heat resistance. However, this produces a material that is very difficult to machine and also generates a high wear rate on extrusion equipment.

This set of materials is at the forefront of modern-day plastic technology. They are all relatively advanced and high on the evolutionary chain of plastic materials. They represent themselves well as valuable additions to the market of commercially available plastics.

Even though many of these formulations and composites were developed with the automotive market in mind (because of their stability at high temperatures), they have found a number of uses in other markets as well. Due to the rapid growth in the number of these materials (in the last five to ten years), potential applications exist in many untapped areas.

Performance Plastics are available in a wide assortment of sizes in sheet, rods, and films.

Performance Plastics
HYD-LAR KAPTON PEEK POLY-SULFONE RYTON (PPS) TORLON ULTEM VESPEL
PHYSICAL
SPECIFIC GRAVITY 1.16 1.32 1.3 1.51 1.27 1.36 1.36 - 1.43
WATER ABSORPTION, 24 hr. (%) .8 0.1 - .5 .3 <0.02 0.33 0.25 0.24
MECHANICAL
TENSILE
Strength, Yield (10³ psi) @ 73°F 20.0 .207 14.5 10.2 9.5 - 12.8 22.0 15.2 10.5 - 17.1
Elongation, Ultimate (%) @ 73°F 4.0 72 30 - 150 1 - 3 15 8 8 - 10
Modulus, Yield (10³ psi) @ 73°F 1,300 522 360 480 - 540 770 430 300
FLEXURAL
Strength (10³ psi) @ 73°F 23.0 16.0 15.4 14.0 - 21.2 34.9 22.0 19.0 - 28.8
Modulus, Yield (10³ psi) @ 73°F 900 550 390 550 730 480 450 - 500
COMPRESSIVE STRENGTH
2% Offset (10³ psi)
18.0 14.0 32.1 21.9 30.0 - 40.0
IMPACT STRENGTH
Izod, Notched (ft-lb/in.) @ 73°F
2.7 .58 1.60
R126
1.30
R120
<0.5
R123
2.7
E86
1.0
M109
1.5
M97-99
HARDNESS
COEFFICIENT OF STATIC FRICTION
Against self 0.20 0.300
Against steel
THERMAL
CONDUCTIVITY (BTU/hr/sq ft/°F/in.) 1.8 2.3 - 2.6
COEFFICIENT OF THERMAL EXPANSION (10⁻⁶/°F) 22 2.1 - 2.4 2.7 1.7 3.1 2.5 - 2.8
SPECIFIC HEAT (BTU/lb/°F) 1.09
HEAT DEFLECTION TEMP (°F)
At 66 psi 470 568 - 608 221 - 275 532 410 530 - 680
At 264 psi 600 500 392 500 - 800
MAX. CONTINUOUS TEMP. (°F)
ELECTRICAL
VOLUME RESISTIVITY (Ohm/cm) 1.40×10⁷ 4.9×10⁶ 5×10¹⁶ 8×10¹⁶ 6.6×10¹⁷ >10¹⁵
DIELECTRIC STRENGTH (V/mil) 6,900 480 425 380 - 410 580 831 310 - 560
DIELECTRIC CONSTANT
At 60 Hz 3.1 3.07 - 3.03 3.9 3.6 - 4.1
At 1 MHz 3.5 - 3.9
DISSIPATION FACTOR
At 60 Hz .0015 .0008 - .0034 0.031 0.0013 0.002 - 0.003
At 1 MHz 0.004 - 0.011
ARC RESISTANCE (SECONDS) 122 120 126 152 - 230