Page 50 - C:\Users\Adik\Documents\Flip PDF Professional\Marketer PPT LR\
P. 50

impact resistance than most advanced engineering plastics. PAI resins are higher
       in thermal stability compared to PEI or polyester enamels.
       Strengths:  Self-lubricating,  Thermal  stability,  Exceptional  strength  and
       Dimensional stability, High elongation, Conformability (non-leaking)
       Limitations:  Very  high  temperature  processing,  Polyamide-imide  is  reactive,
       Molecular weight and so viscosity increases with temperature, Risk of “seizing”
       screw & barrel, Regrind STRONGLY discouraged
       Applications:  Aircraft  hardware  and  fasteners,  Mechanical  gears,  seals,
       fasteners,  slides,  bushing,  thrust  washers,  and  structural  components,
       Transmission and power train components, Coatings, composites, additives, Oil
       and  gas  exploration  and  recovery  equipment,  Electric  motor  components,
       Semiconductor fabrication and testing
         POLYARYLETHERKETONES (PAEK):
       Family of poly(aryletherketone) or PAEKs including PEK, PEEK, PEKK, PEEKK
       and  PEKEKK  have  been  described  as  the  world's  highest  performance
       thermoplastic polymers. The family members differ according to the proportion and
       sequence of ether (E) and ketone (K) components in the monomer, higher the ratio
       and  sequence  of  keto  groups,  the  rigidity  of  the  polymer  chain  and  melting
       temperature are increasing.
       48) Polyetheretherketone (PEEK):
       Are unique semi-crystalline, high purity polymers, the most widely used member of
       the PAEK family comprising of repeating monomers of two ether groups and a
       ketone group.
       Density                                   1.23 - 1.65 g/cm 3
       Glass transition temperature Tg           140 - 146 °C
       Max / Min continuous Service temperature  170 - 260 °C / - 65 to -70 °C
       Melting Point Tm                          334 - 380 °C
       PEEK can be processed using all conventional thermoplastic processes such as
       injection moulding, extrusion, compression and transfer moulding.
       Processing temperature of PEEK is 360 to 400°C.
       Pre drying is necessary: 3 hrs. at 150°C recommended.
       Injection Moulding: suitable for injection of very small parts with tight dimensional
       tolerances. Cooling temperature has a strong influence on crystallinity and thus on
       performances. Mould temperature of 160-200°C is recommended to obtain good
       crystallisation and minimise warping. Post crystallisation at 200°C is possible but it
       is not recommended for applications requiring high dimensional stability.
       Extrusion:  oriented,  bi-oriented  films  and  sheet  extrusion  possible.  Cooling
       cylinders at 50°C lead to amorphous material while cylinders at 170°C lead to
       opaque and highly crystalline material.
       PEEK  posses  excellent  mechanical  properties  with  dimensional  stability  and
       outstanding chemical resistance that are retained to high temperatures in a high-
       pressure steam and hot water environment. They are inert to all common solvents
       and resist a wide range of organic and inorganic liquids. It has maximum continuous
       working temp. in excess of 250°C and short term operating temperature is 300°C.


     DAVE TECHNICAL SERVICES            50
   45   46   47   48   49   50   51   52   53   54   55