PEEK – Polyetheretherketone – Polyether ether ketone .
Application: Technical plastics used in industry, airplanes, cars, pharmaceutical industry M. M. Is often used as an alternative to metals such as stainless steel and titanium.
Kabelisolering, electrical connectors and other heat-loaded particles.
Valves, pumpedele, gears, tenant, worm gear, hydraulikdele, slidringe, scrapers, kitchen equipment used at high temperature.
Fire: PEEK is difficult to ignite, self-extinguishing with very low smoke gas and, and meets fire class UL94 V0 down to a thickness of 1,45 mm. without the use of additives.
Electrical properties: Carbonforstærket PEEK is leading.
extrusion: Extrusion is best with 3 sect ions worm and a L / D ratio 22 to 30. The melting temperature in the range of 400 to 430OC and the feed temperature of at least 425OC is recommended. Up to 30 % recycling may be used.
Colors: Natural color is gray-brown. Mixtures are often black.
Moisture absorption: Up to 0.5 % (50% rh)
Physiological properties: Pure PEEK can be approved according to EU directives and the American FDA regulations concerning plastic materials used in contact with food.
Trade names: Victrex® PEEK, Ketron® PEEK .
History: PEEK was first manufactured in the UK in 1977 on ICI`s labetorium and was introduced on the market 1978.
Then came other manufacturers, bl.a. Du Pont , BASF og Hoechst.
Hydrolysis resistance: Can be used in thousands of hours in pressurized water and steam up to 250 ° C without special modification of properties.
Category: Delkrystallinsk thermoplastic.
Chemical resistance: God kemikaliebestandighed. Concentrated sulfuric acid may dissolve PEEK. The plastic is also affected by smoking, concentrated nitric acid. Stress cracking may arise in connection with acetone.
Peek withstand radiation – gamma- and the X-rays. Approved by the Japanese MITI.
Chemical structure: Density 1,28 – 1,32 g/cm³
Bonding: PEEK kan limes med lime som cyanoakrylat, epoxy og silicone. The surface may be pretreated mechanically.
Mechanical properties: PEEK has high strength, high toughness, rigidity and little cold flow at the load. Slid- and the fatigue resistance is good. PEEK has little kærvsejhed.
FRP types can withstand high static and dynamic loads at temperatures up to 300 ° C.
Optical properties: opaque.
Surface treatment: Can be metallised with conventional techniques for thermoplastic materials.
Cleaning: PEEK withstand sterilization in an autoclave, damp, Grim arme, ætylen oxide, and gamma radiation.
Injection molding: Injection molding runs best with an L / D ratio of 18 to 22. The melting temperature in the range of 370 to 400OC. Mold temperature should be between 160 to 215OC.
Injektionstryk he 1500 bar, decreasing to 1000 bar for the second stage. Injection speed can be high because the material is not damaged by decomposition through shearing. The screw speed can also be high.
Cutting: PEEK can be processed with cutting tools in general værktøjsmaskiner.Hvis cooling is required, may be used water or air.
Welding: Stuksvejsning materials and. Hot gas welding . ultrasound. Friction welding.
Thermal Properties. Melting point 343 ° C. På as Glasovergangstemperatur. 145°C.
PEEK may anvendes in the temperature range – 60 to 250 ° C. FRP types can be used temporarily up to 315 ° C. PEEK is notch sensitive and brittle at low temperature; is therefore often used with fiber reinforcement.
Dimensionsstabiliteten er god; with fiber reinforcement can be compared to steel.
PEEK added carbon can increase the thermal conductivity by about. 3,5 times of pure PEEK, which include. is used for cooling of the bearings M. M.
additives: PEEK can be supplied with cool- glass fiber reinforcement and UV stability and heat conductivity can be improved by the addition of carbon.
PTFE – graphite – carbonfibre
UV- Stability: PEEK is affected by UV rays, but degradation is slow. Depending on the thickness of approximately. 1 % reduction of strength in a year of outdoor exposure. UV stability may be increased by the addition of carbon, or can be painted with e.g.. carbonblack.
PEEK has good resistance to beta, gamma and X-rays.
Thermoforming (Termoformning): Difficult