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Max / Min continuous Service temperature 175 - 185 °C / -98 to -101°C
Processing temperature: 340 to 390°C
Drying recommended : % of water < 0.04 %: 4 hr. at 150°C or 2 hr. at 180°C.
Injection Moulding: Mouldings of very small parts with tight dimensional
tolerances. Melt temperature of 360°C & mould temperature of around 150°C is
recommended.
Extrusion temperature: Screw with L/D of 20 is recommended. Elasticity is
generally high, so the orientation is weak.
PESU is tough, rigid having high strength and stiffness with excellent thermal
o
stability, an ability to withstand loads at temperatures of up to 180 C for long periods
and an ability to retain many mechanical and electrical properties at temperatures
o
up to 210 C. Hard to burn, flame retardant with very low smoke and toxic gas
emissions on burning. Possess excellent electrical insulation properties, good
creep performance especially when glass reinforced, good resistance to hydrolysis
and most common sterilisation methods. PESU has good chemical resistance to
oils, petrol, to a wide pH range of acids and alkalis, aliphatic hydrocarbons,
alcohols, benzene, fats and cleaning and degreasing agents.
PESU can be welded by friction, heat and ultrasound welding, solvent weld with
methylene chloride, be vacuum metallised, electroplated, painted or etched
Strengths: high temperature performance and rigidity even at high temperature,
excellent sterilization resistance, good creep resistance, excellent insulation
properties, hydrolysis resistance under pressure up to 150°C, biocompatible and
intrinsic flame retardant
Limitations: Very high cost, Narrow processing window and high temperatures,
attacked by polar solvents such as ketones, chlorinated solvents and aromatic
hydrocarbons, poor UV light resistance, poor tracking resistance, relatively low
notch sensitivity, charpy and impact resistance.
Applications: Switch parts, cores for solenoids, lamp holders, connector housings,
condensator film, gears, in hydrolysing or aggressive environments, automotive
cooling system, fans, engine parts, drive parts, bulb reflectors, interior parts for
aircrafts, parts for irons, coffee machines, micro wave, hot water meters and valve,
parts for medical devices, Dyaliser, sterilisation trays, laboratory centrifuges, dental
equipment, weapons components, plastic bearing cages, oven components.
44) Polyphenylsulphone (PPSU):
Is an amorphous transparent plastic having a high melting temperature with quite
low moisture absorption. Furthermore, it has better impact strength and chemical
resistance than PSU and PESU from the polysulphone group. Also, PPSU can be
better sterilized with superheated steam than other members of this group of
polymers, and is resistant to detergents and disinfectants.
Density 1.29 - 1.3 g/cm 3
Glass transition temperature 220 °C
Max continuous Service temperature 149 - 210°C
Processing temperature: 365 to 390°C
Drying is needed: 2 hr. at 175°C or 4 h at 150°C.
As many amorphous polymer, melt viscosity is quite high.
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