TORAYCON® PBT Resin

Technical Information | Thermal properties

Thermal properties

Table 6 shows the thermal properties of Toray's TORAYCON® PBT resin.

Table 6: Thermal properties of Toray's TORAYCON® PBT resin
Category Unit Non-reinforced grade Glass-fiber reinforced grade
1401X06 1101G-30
Melting point   °C 224 224
Linear expansion coefficient   10-5/°C 9.4 2.0
Deflection temperature under load 0.45MPa °C 154 220
  1.82MPa °C 58 212
Heat-sag temperature   °C 190 220

Ⅰ. Deflection temperature under load

As mentioned earlier, TORAYCON® has a high melting point (224°C) and exhibits a high deflection temperature under low loads relative to other non-reinforced grades.
The glass-fiber reinforced grade exhibits a deflection temperature (212°C) under high loads that is close to its melting point.
Figure 13 shows heat sag temperature under no load. The values shown are extremely high--190°C for the non-reinforced grade (1401X06) and 220°C for the glass-fiber reinforced grade (1101G-30).
Even under high temperatures, TORAYCON® is the most heat-resistant among thermoplastic resins. That makes TORAYCON® the best resin for applications requiring exposure to high temperatures for extended durations of time.
Figures 14 and 15 compare the deflection temperatures under load of different resins.

Figure 13: Heat-sag and discoloration temperatures for different types of plastics

Figure 13: Heat-sag and discoloration temperatures for different types of plastics

Figure 14: Deflection temperature under load (1.82 MPa) of different plastics (reinforced types)

Figure 14: Deflection temperature under load (1.82 MPa) of different plastics (reinforced types)

Figure 15: Deflection temperature under load (0.45 MPa) of different plastics (non-reinforced types)

Figure 15: Deflection temperature under load (0.45 MPa) of different plastics (non-reinforced types)

Ⅱ. Resistance to thermal degradation

TORAYCON® PBT resin exhibits superb heat-resistance and little deterioration of physical properties when exposed to high temperatures for extended durations of time.
Figures 16-1 through 16-3 and 17 show the dry-heat resistance properties of TORAYCON®.
The glass-fiber reinforced grade (1101G-30) withstands continuous use at 130-150°C and can even be used in applications requiring exposure to 200°C intermittently or for short durations of time.
The non-reinforced grade (1401X06) withstands continuous use at 120-140°C and can be used in applications requiring exposure to 170°C intermittently or for short durations of time.

  • Figure 16-1: Dry-heat resistance of 1401X06 (130°C) Figure 16-1: Dry-heat resistance of 1401X06 (130°C)
  • Figure 16-2: Dry-heat resistance of 1401X06 (130°C) Figure 16-2: Dry-heat resistance of 1401X06 (130°C)
  • Figure 16-3: Dry-heat resistance of 1401X06 (130°C) Figure 16-3: Dry-heat resistance of 1401X06 (130°C)
  • Figure 17: Dry-heat resistance of glass-fiber reinforced resins Figure 17: Dry-heat resistance of glass-fiber reinforced resins

Ⅲ. Solder resistance

TORAYCON® glass-fiber reinforced grade (1101G-30) has excellent solder resistance compared to other thermoplastic resins, withstanding temperatures up to 260°C for limited durations of time.
Table 7 shows the solder resistance (at 260°C) of various glass-fiber reinforced grades.

Table 7: Solder resistance of various glass-fiber reinforced grades (260°C)
Name of resin Soaking time tolerance (s)
1101G-30 3
PET G30 2
Nylon 6 G30 2
Modified PPO G30 No more than 1

Ⅳ. Linear expansion coefficient

Figure 18: Comparison of linear expansion coefficients

Figure 18: Comparison of linear expansion coefficients

The linear expansion coefficient of TORAYCON® glass-fiber reinforced grade (1101G-30) is 2.0 x 10-5/°C—a small value relative to other thermoplastic resins and very close to that of aluminum or zinc. For that reason, 1101G-30 can be used in place of aluminum or zinc die casts in some applications. Figure 18 shows a comparison of linear expansion coefficients for various materials.