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PEEK™

Polyether-ether-keytone, better know as PEEK™ (PEEK is a trade mark of Victex, PLC.), is a high-temperature thermoplastic. This aromatic ketone material offers outstanding thermal and combustion characteristics and resistance to a wide range of solvents and proprietary fluids. PEEK™ can also be reinforced with glass, carbon or special additives for applications such as bearings.

CHEMISTRY AND PROPERTIES

MECHANICAL	Unfilled	30% Glass Filled	30%Carbon Filled
Tensile Strength: @73°F (Break/Yield) @250°C (Break/Yield)	14,100(y) 1740 (y)	22,620(b) 4930(b)	33,785(b) 6235(b)
Flexural Modulus: @73°F @250°F @482°F	594,500 580,000 43,500	1,450,000 1,334,000 435,000	2,929,000 2,697,000 739,500
Ixod Impact Strength: 73°F Notched 0.25mm radius 3.5mm depth	1.57	1.8	1.59
Thermal: Glass transition temperature. Tg (onset value) Unit °F	289	289	289

PEEK™'s structure contributes to its high-temperature performance and very low water absorption. Its crystalline character gives it important advantages including resistance to organic solvents, dynamic fatigue and retention of ductility.

MECHANICAL
At room temperature, PEEK™ functions as a typical engineering thermoplastic. It is tough, strong, rigid, has good loadbearing properties over long periods, and it is resistance to both abrasion and dynamic fatigue.

THERMAL
PEEK™'s continuous service UV rating is 482°F (250°C) for unfilled and 500°F (260°C) for glass filled grades. PEEK™ also offers high temperature mechanical properties making it suitable for some application up to 600°F. (315.).

FLAMMABILITY
PEEK™ has a high "Oxygen Index" and meets UL 94 -VO requirements, and demonstrates extremely low smoke emission. It contains no flame-retardant additives or halogens.

CHEMICAL RESISTANCE
PEEK™ has good resistance to aqueous reagents and long-term performance in superheated water at 500°F. (260°C.). Its resistance to attack is good over a wide pH range from 60% sulfuric acid to 40% sodium hydroxide at elevated temperatures. Attack can occur with some concentrated acids.

HYDROLYSIS RESISTANCE
PEEK™ can be used for thousands of hours at temperatures in excess of 480°F. (250°C.) in steam or high-pressure water environments without significant degradation in properties.

RADIATION RESISTANCE
Preliminary tests suggest that radiation resistance is extremely good.

PROCESSING
PEEK™ is easily processed using a wide range of conventional thermoplastic processing equipment. Injection molded items do not require post-treatment.

The tensile properties of PEEK™ exceed those of most engineering plastics and can be reinforced with carbon fiber resulting in a tensile strength of over 29,000 psi (200 MPa) with excellent properties being retained up to 570°F. (300°C.).

The exceptional stiffness of PEEK™ is reflected in its flexural modulus which is among the best of any thermoplastic. Glass or carbon fiber reinforcement gives further improvement up to very high temperatures.

PEEK™ combines excellent tribological properties with moldability and outstanding performance at high temperatures. Carbon fiber-reinforced PEEK™ is probably the only injection moldable bearing material that has a measurable wear factor at over 500°F. (260°C.); all the thermoplastics fail at or below this temperature.

Parkway Products, Inc. is one of the leading molders of PEEK™ in Northern America. Parkway provides complete design, engineering, mold making and secondary machining in house.