Characteristics of the PES


Dimensional stability at high temperatures, low

coefficient of thermal expansion.

Good resistance to creep, even up to 150°C.

Good impact resistance, however, it is

susceptible to notching.

PES retains its toughness at low temperatures,

even at cryogenic temperatures.

Good electrical properties even at high

temperatures, i.e., above 200°C.

Good resistance to radiation, X-rays, beta rays,

and gamma rays.

Good chemical resistance.




Good resistance to ß, γ and X radiation.

FAR standard compliant because it gives off little


Good resistance to hydrolysis at a wide range of

pH values.

PES is well-suited for electrolytic or vacuum


Good adherence of ionic deposition of thin layers

of metal (copper, gold, aluminium).


PES is a very useful electrical insulator at high

temperatures because it maintains a low loss

factor, a good dielectric constant, and high

volume resistivity at temperatures over 200°C.

At 20°C, the dielectric constant is 3.5 for a

frequency range of 50 Hz to 10 kHz, and varies

very little when the material contains moisture.


This combination of a 3.5 dielectric constant and

a loss tangent of 0.001 is unusual.



PES has excellent creep resistance.

PES has good impact resistance.

At -100°C the material retains a useful impact


Good tensile strength: 76 N/mm² at 180°C.

Good flexural modulus: 2300 N/mm² at 180°C.


PES remains usable for thousands of hours at

200°C without significant loss of mechanical


Heat deflection temperature under load

(HDT - 1.8N/mm²) 203°C.

Glass transition temperature: around 220°C.


PES resists well against aqueous solutions of

acids and bases.

Good resistance to chlorinated or fluorinated

hydrocarbons. Unsuitable solvents: methylene

chloride, 1,1,2-trichloroethane, and chloroform.

At low stress, PES can withstand short-term

exposure to solvents such as benzene, xylene,

and toluene.

Polar aromatics dissolve PES.

Holds up well against most oils and greases,

even at high temperatures, except for oils

consisting of diesters and phosphate esters.

It can be used in contact with fuels and premium-

grade petrol. For high stress at high

temperatures, make use of the qualities of glass


PES is weakened by UV.


PES has a low level of flammability, and its

combustion gives off very little smoke and toxic



The PES range has V0 classification under the

UL 94 standard at a thickness of 0.43 mm, and

oxygen indices ranging between 34-41.