High tensile strength
Polyester film is a thermoplastic polymer formed by condensation of terephthalic acid and ethylene glycol. It has exceptional properties such as low water absorption and a high tensile strength of 137 MPa. Its melting point is approximately 254 degC. Optical clear polyester film has excellent toughness and dimensional stability, making it an ideal material for graphic arts films.
BOPET (biaxially-oriented polyethylene terephthalate) is the most important polyester film. This type of material has a higher modulus than standard PET films, and is highly resistant to tearing. It is also transparent and reflective. Moreover, it is resistant to heat and humidity and is ideal for food packaging applications.
Chemical resistance
The chemical resistance of a polyester film is dependent on several factors. These factors include molecular structure, mechanical load, type of additives, concentration of solvent or chemical reagent, exposure time, and temperature. The film's chemical resistance varies according to the application, but the following factors are considered the most important ones.
In general, the chemical resistance of polyester depends on several factors, including the presence of a hydrocarbon. The chemical resistance of a film can vary significantly depending on the copolymer composition. The stiffness of the resin is also a major factor affecting its hydrocarbon resistance. Generally, the stiffer a film is, the better.
Thermal stability
The thermal stability of polyester film is dependent on the type and composition of the polymer used. Thermal stability depends on bond energies, molecular weight, functional groups, and degree of unsaturation. The blend's compatibilizer is an important factor, as it produces a homogeneous microstructure and improved thermal stability.
Thermal and electrical insulation
A versatile and durable material, polyester film has many applications in the construction industry. It is a highly versatile product due to its high elongation at break and low extractable content. Its thermal and electrical insulation properties make it perfect for a wide variety of applications. In addition, it does not absorb moisture or discolor when exposed to high temperatures.
The most common uses for polyester film include interlayer insulation in transformers, the cover layer of relay coils, phase insulation, slot sleeve insulation, and insulating layer for electrical devices. These applications allow it to provide unique design possibilities for the electrical industry. Polyester film is highly resistant to most solvents and can be used in temperatures ranging from -70 deg C. to 150 degrees C.
