Features of SUMIKAEXCEL PES

Introduction

SUMIKAEXCEL PES (Polyethersulphone) is a heat resistant amorphous resin that Sumitomo Chemical manufactures in Japan under license from Imperial Chemical Industries PLC. The molecular structure is shown in the figure below.

The molecular structure of SUMIKAEXCEL PES (Polyethersulphone)

SUMIKAEXCEL PES is a transparent resin with a slightly amber color. It possesses a variety of useful properties, such as heat resistance, creep resistance, dimensional stability, flame resistance and hot water resistance. SUMIKAEXCEL PES is utilized as a molding material in many different applications, including : electronic components, such as relays and burn-in sockets ; IC trays ; printers; photocopier components; sterile medical and dental instruments ; and LCD substrate films for pagers and mobile phones.
In addition, SUMIKAEXCEL PES is also available in powder grades. Powder grades are utilized for a wide range of applications, including: impact modifier for epoxy-based composites used in aircraft ; heat resistant coatings; adhesives; flat films and hollow-fiber membranes used in the medical and other industries.

Features of SUMIKAEXCEL PES

Heat Resistance

The DTUL (Deflection Temperature Under Load) for SUMIKAEXCEL PES ranges from 200 - 220 deg C and the UL temperature index designates its continuous service temperature as 180 - 190 deg C.
Its flexural modulus is very stable at temperatures ranging from -100 to +200 deg C. In particular, at temperatures of 100 deg C or greater, SUMIKAEXCEL PES shows the highest flexural modulus among most thermoplastic resins (Figure 1). As well, due to its excellent thermal stability during the molding process, the amount of gas trapped within moldings is much lower than in other engineering plastics (Figure 2).

Figure 1 : Temperature Dependency of Flexural Modulus

Figure 1 : Temperature Dependency of Flexural Modulus

Figure 2 : Molding Temperature and Emission Gas from Moldings

Figure 2 : Molding Temperature and Emission Gas from Moldings

(Dumbells molded at each temperature were heated to 120 deg C for 20 hrs, and the emission gas was analyzed using head space gas chromatograph.)

Impact Resistance

SUMIKAEXCEL PES possesses a good impact strength. Snap-fit products can be produced with natural grades, however, additional precautions must be observed, as SUMIKAEXCEL PES is susceptible to breakage at sharp notches.

Creep Resistance

At temperatures ranging up to 180 deg C, SUMIKAEXCEL PES exhibits the highest creep resistance among all thermoplastic resins.

Light Transmittance

SUMIKAEXCEL PES possesses a high level of light transmittance, outstanding among most heat resistant engineering plastics.

Figure 3 : Light transmittance of SUMIKAEXCEL PES

Figure 2 : Light transmittance of PES

Dimensional Stability

SUMIKAEXCEL PES exhibits both a low coefficient of linear expansion and a low temperature dependence. In particular, the coefficient of linear expansion of grades having high glass fiber content (4101GL30) is 2.3 10-5/deg C. This value is similar to that of aluminum, and is maintained up to nearly 200 deg C.

Figure 4 : Temperature Dependency of Coefficient of Linear Expansion

Figure 4 : Temperature Dependency of Coefficient of Linear Expansion

Flame Resistance

SUMIKAEXCEL PES has been certified as UL94V-0 (0.43 mm) without any flame retardants. In addition, according to the results of testing conducted by the American National Bureau of Standards, it is commonly understood that, during combustion, SUMIKAEXCEL PES generates the lowest amounts of smoke among all plastics.

Figure 5 : Results of Smoke Chamber Tests of U.S. NBS

Figure 5 : Results of Smoke Chamber Tests of U.S. NBS

(flaming up state 1/8" sample)

Hot water Resistance

SUMIKAEXCEL PES is not susceptible to hydrolysis, thus enabling its usage in hot water and steam having a high temperature of 160 deg C. However, attentions must be given to potential changes in its properties that may occur due to the absorption of water.

Chemical Resistance

SUMIKAEXCEL PES can withstand cleaning solvents, oil and grease, such as Chlorothene Freon, gasoline and engine oil. However, SUMIKAEXCEL PES is affected by polar solvents such as acetone and chloroform. Therefore, additional precautions must be taken whenever these solvents are used. SUMIKAEXCEL PES possesses the highest resistance to stress cracking among most amorphous resins (Table 1).
SUMIKAEXCEL PES is also resistant to the effects of acid and alkali solutions, even at high temperatures. However, an assessment of effects should be conducted on actual moldings prior to usage.

Table 1 : Chemical Resistance, Stress Cracking Resistance

  Immersion Test Stress Cracking Resistance Test
4800G 4800G Polysulfone
Ammonia A - -
50% NaOH A - -
Conc. hydrochloric acid A - -
10% Nitric acid A - -
Conc. nitric acid C - -
Hydrogen peroxide A - -
Benzene A a c
Xylene B a c
Acetone C c c
Methyl ethyl ketone C c c
Heptane A a a
Cyclohexane A a a
Glycerine A a a
Ethylene glycol A a a
Carbon tetrachloride A a a
Gasoline A a b
Ethyl acetate C b c

A: No effect
B: Some effect
C: Unfit for use.
a: Can be used, except under large loads.
b: Can only be used when the load is small.
c: Unfit for use.

Weather Resistance

SUMIKAEXCEL PES does not possess good weather resistance. However, for certain applications, the addition of carbon black to a grade may render it adequate for outdoor usage.

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