Heat and Cold Resistance

Long-Term Thermal Resistance

Below is an Arrhenius plot showing the relationship between the temperature and the time taken to reduce Torelina™'s tensile strength, tensile elongation, and dielectric strength by half of their initial values, when forced aging is applied at various temperatures. Fig. P1 estimates Torelina™'s durability when it is used over extended periods of time at high temperatures.

Long-Term Thermal Resistance

Long-Term Thermal Resistance of Torelina™

  Standards Minimum Thickness (μm) Upper Limit of Usable Temperature (°C)
Elongation Strength Electrical Properties
U.S. UL746B 9 (160) 160 200
Japan Material registration according to the Electrical Appliance and Material Control Law 9 155 170 180

Short-Term Thermal Resistance

For short periods of time, such as several seconds to hours, Torelina™ can withstand even higher temperatures than the aforementioned long-term thermal resistance. Table P2 shows the variation of mechanical properties after Torelina™ has been heated for one hour at 230°C and 260°C. Virtually no deterioration is found in mechanical properties of Torelina™ under these testing conditions.

Table 2: Short-Term Thermal Resistance of Torelina™ at High Temperatures

Film Thickness (µm) Property Heating Conditions
No Heat Treatment 230°C × 1 hr. 260°C × 1 hr.
12 Tensile Strength (MPa) 250 220 200
Tensile Elongation (%) 67 71 87
Dielectric Strength (kV/mm, AC) 213 213 228
25 Tensile Strength (MPa) 250 220 170
Tensile Elongation (%) 73 68 72
Dielectric Strength (kV/mm, AC) 247 239 264
75 Tensile Strength (MPa) 250 220 210
Tensile Elongation (%) 72 63 79
Dielectric Strength (kV/mm, AC) 165 166 163
  • Tensile strength and elongation measured using ASTM D882-64T across the film length
    Dielectric breakdown strength JIS C-2151

Torelina™ Technical Information