Heat Resistance of SUMIKAEXCEL PES

Table 1 indicates the thermal properties of SUMIKAEXCEL PES that are required for the design of moldings.

Tables 1 Thermal Properties of SUMIKAEXEL PES

Test Properties Test Method
(ASTM)
Units Non-reinforced Glass Fiber Reinforced
3600G
4100G
4800G
3601GL20
4101GL20
3601GL30
4101GL30
Thermal Propertie (DTUL) Deflection Temperature Under Load (0.45Ma) D648 deg C 210 - -
(DTUL) Deflection Temperature Under Load (1.82Ma) D648 deg C 203 210 216
Vicat softening Point (1kg) D1525 deg C 226 - -
Vicat softening Point (5kg) D1525 deg C 222 - -
Coefficient of Linear Expansion (MD) D696 10-5/K 5.5 2.6 2.3
Coefficient of Linear Expansion (TD) D696 10-5/K 5.7 4.8 4.3
Heat Conductivity C177 W/(m・K) 0.18 0.22 0.24
Specific Heat - J/(kg・K) 1,121 - -
Temperature Index UL746 deg C 180 180 190

Continuous Service Temperature

The UL temperature index for long-term continuous service of SUMIKAEXCEL PES is 180 - 190 deg C, which is the highest temperature value among most
amorphous resins.
Figure 1 depicts the tensile strength half-life of SUMIKAEXCEL PES. At a temperature of 180 deg C, SUMIKAEXCEL PES will lose a half of its original tensile strength after 20 years. At a temperature of 200 deg C, this half-life is shortened to 5 years.

Figure 1 Temperature Dependence of Tensile Strength Half-Life

Figure 1 Temperature Dependence of Tensile Strength Half-Life

Temperature Dependence of Flexural Modulus

Figure 2 depicts the temperature dependence of the flexural modulus. The flexural modulus is very stable at the temperatures ranging from -100 to +200 deg C. In particular, SUMIKAEXCEL PES has far better temperature dependence characteristics than glass fiber reinforced materials, such as PBT and PPS crystalline resins, at temperatures greater than 100 deg C, thus SUMIKAEXCEL PES is ranked at the top of its class among most thermoplastic resins.

Figure 2 Temperature Dependence of Flexural modulus

Figure 2 Temperature Dependence of Flexural modulus

Aging Characteristics (in Air and in Hot Water)

Heat Aging Characteristics

SUMIKAEXCEL PES has excellent long life heat stability. Even after SUMIKAEXCEL PES is aged in air at a temperature of 150 deg C, its strength does not deteriorate.

Figure 3 Effects of Aging on Tensile Strength, in Air at a Temperature of 150 deg C

Figure 3 Effects of Aging on Tensile Strength, in Air at a Temperature of 150 deg C

Hot Water Resistance

Changes in the tensile strength of SUMIKAEXCEL PES are minimal (Figure 4) after aging in both water (23 deg C) and in hot water (100 deg C).
SUMIKAEXCEL PES impact strength drops slightly upon initial exposure to hot water (100 deg C), however an adequate level of impact resistance (Figure 5) is maintained during subsequent exposure.

Figure 4 Aging Dependence in Hot Water for Tensile Strength

Figure 4 Aging Dependence in Hot Water for Tensile Strength

Figure 5 Aging Dependence in Hot Water for Impact Strength

Figure 5 Aging Dependence in Hot Water for Impact Strength

Steam Resistance (Effects from Steam Sterilization Cycle)

No changes to impact strength were observed as a result of cyclical tests using a steam pressure of 3.2 atmospheres (143 deg C) ↔ vacuum dehydration (room temperature).
However, when SUMIKAEXCEL PES is to be used at high temperatures or in hot water, testing should be performed prior to usage at actual operating temperatures, in accordance with the specified application.

Coefficient of Linear Expansion

SUMIKAEXCEL PES possesses the special properties of having both a low coefficient of linear expansion and a low temperature dependence. Figure 6 depicts the temperature dependence of the coefficient of linear expansion. The coefficient of linear expansion of crystalline PPS (40% GF) increases as the temperature rises. However, the coefficient of linear expansion of amorphous SUMIKAEXCEL PES is not temperature-dependent and maintains a constant value up until a temperature of 200 deg C. Furthermore, 4101GL30, a glass fiber reinforced grade, possesses a coefficient of linear expansion as low as that of aluminum, which is 2.3x10-5 /deg C. For this reason, 4101GL30 is considered to be a suitable material for usage in precision molding applications.

Figure 6 Temperature dependability of a coefficient of linear expansion

Figure 6 Temperature dependability of a coefficient of linear expansion
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