- Torelina* is the world's first PPS film that was commercialized by Toray. Torelina* excels in electrical properties and dimensional stability. Its UL-certified high temperature durability exceeds that of Lumirror*. Therefore, this material is extensively used in various applications such as mold releaser and for electronic components.
Resistance to high and low temperatures
- Torelina* has UL 746B-approved long-term thermal resistance indices of 160°C(mechanical) and 200°C(electrical), enabling its continuous use at extremely high temperatures. Under some conditions, Torelina* can be used within a 230°C to 260°C temperature range for a short period of time. Torelina* also features superior resistance to low temperatures, and has excellent mechanical properties under liquid helium temperature conditions. Torelina*, a biaxially-oriented crystalline film, does not exhibit the stress-cracking and solvent-cracking behavior observed in non-oriented films of amorphous polymer.
Nonflammability
- Torelina* is a self-extinguishing film. Film thicker than 25µm is approved by UL 94 as VTM-0 grade.
Chemical Resistance
- Torelina* shows excellent chemical resistance to virtually all of types of chemicals. No organic solvents can dissolve PPS at room temperature. The properties of Torelina* are also stable even when encountering acid and base.
Moisture absorption and hydrolysis resistance
- Torelina* features a moisture absorption of 0.05% and a hygroscopic expansion coefficient of 1.5*10-6%RH-1, both of which are one digit lower than the figures for polyester film. Torelina*fs various properties are not affected by humidity variations. Furthermore, PPS film shows exceptional resistance to hydrolysis. No deterioration is observed in vapor at high temperatures, a problem found in polyester and polyimide films.
Electrical Properties
- Despite a relatively high dielectric constant of 3.0, Torelina*fs electrical properties are stable over a 0°C to 100-120°C temperature range and a frequency range up to the gigahertz level. This provides exceptional temperature and frequency characteristics. Its glass transition temperature is approximately 20°C higher than that of polyester film, thus maintaining minimal dielectric loss at even higher temperatures.
Creep Characteristics
- In Comparison with other films, Torelina* exhibits a lower dimensional change ever after being subject to stress for long periods of time.
Applications and Processability
- Torelina* is used for various applications such as capasitor,motor/transformer insulation,industrial tapes, releasing.
Polyphenylene Sulfide (PPS)
As shown below, PPS is a polymer simply composed of a series of alternating aromatic rings and sulfur atoms. This material was first discovered in the late 19th century, as is evidenced in studies by Friedel and Crafts.
However, the history of PPS as an industrial material is relatively short. In the 1940's and 1950's, many engineers failed in their attempts to produce PPS for industrial use. In 1967, however, Edmonds and Hill of Phillips Petroleum Company devised a method for producing PPS through the synthesis of para-dichlorobenzene and sodium sulfide. This marked the beginning of industrial-scale commercialization of PPS.
In 1972, Phillips Petroleum used its original manufacturing technology to begin commercial-scale production of PPS. They called the product Ryton* and it was soon noted for having effectively balanced thermal and chemical resistances, nonflammability and electrical properties. Ryton* is highly renowned today in the field of injection molding as a rapidly growing heat-resistant polymer.
