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PEEK has high strength and stiffness, are resistance to wear, chemical
environments, hydrolysis, sterilisation and fire together with biocompatibility, purity,
low smoke and toxic gas emission and electrical performances. Being very pure;
introduce virtually no contamination during use, are one of the only polymers that
can be used as a metal replacement for high temperature applications and among
few plastics compatible with vacuum applications. They have low coefficient of
friction and very good tribological properties.
Unfilled PEEK is highly robust; naturally abrasion resistant, has very high strength
and Young´s Modulus, combined with high ductility. When reinforced with glass and
carbon fibers provide enhanced mechanical and thermal properties.
Strengths: PEEKS have excellent machinability, wear and slide properties, are
flame retardant and can be sterilized with gamma and steam repeatedly. PEEK is
53% harder than Acetal, has 36% greater tensile strength than nylon 6, 6 and is
almost 60% stiffer. Its short term operating temperature is 40 degrees more than
PTFE, that's 15% higher.
Limitations: limits its application to high value items due to high cost, high
processing temperature, anisotropic, attacked some halogenated compounds at
high temperatures, dissolves completely in conc. sulfuric acid at room temperature.
Applications: Industrial chains, bearings, bushings, gears, piston parts, valves
and seals, HPLC columns, wire coatings, electric heat insulation, connectors and
pump housings, automotive suspension parts, gear, transmission thrust bearings
and washers, ABS brake systems, Semiconductor machinery components, silicon
wafer carriers, aerospace parts and interior, used in construction of solar, wind,
nuclear, geothermal and hydropower equipment and components, oil and gas
industry underwater piping and connectors, multiple sterilised medical devices and
surgical instruments, medical implants, fixation plates, arthroscopic bone screws,
finger joints, hip and femoral bone replacements, dental abutments, healing caps.
49) Polyetherketoneketone (PEKK):
is a semi-crystalline thermoplastic, member of PAEK family, having high heat
resistance, chemical resistance and the ability to withstand high mechanical loads.
PEKK has superior temperature resistance than other Ketone base polymers (PEK
& PEEK). PEKK also material of choice in applications, where long-term exposure
to repeated stress and in wet environment is involved, have better aesthetics.
Density 1.28 - 1.60 g/cm 3
Glass transition temperature Tg 155 - 160°C
Max continuous Service temperature 250 °C
Melting Point Tm 306 - 360°C
Pre-drying is necessary: 3 hours at 150°C recommended
Processable by extrusion, thermoforming, injection moulding, compression
moulding, rotomoulding, laser sintering and calendaring. PEKK has the lowest melt
temperature while highest glass transition temperature in the PAEK
(polyaryletherketone) material family.
PEKK has excellent compressive strength, creep resistance, wear and radiation
resistance, high toughness and damage tolerance, low water uptake and indefinite
shelf life at room temperature. It is inherently flame retardant and has excellent heat
release, low smoke generation and low toxicity. Because of these characteristics, it
exhibits superior ablative characteristics & is biocompatible.

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