Lumirror®

Lumirror polyester film – high-performance PET film for industrial applications

In modern industry, high-quality materials are crucial for the success of technical applications. Lumirror polyester film from Toray Industries has established itself as one of the leading PET films for demanding industrial uses. The biaxially oriented polyester film offers an excellent combination of mechanical strength, thermal stability, and outstanding processing properties. Whether in electronics, the automotive industry, or LED applications – Lumirror impresses with consistently high quality and reliability.

What is Lumirror polyester film?

Lumirror polyester film is a biaxially oriented PET film from the Japanese manufacturer Toray Industries, one of the world’s leading producers of high-quality plastic materials. Production has been carried out for over 40 years using advanced technology, which ensures consistent quality and precise properties.

The special manufacturing process gives Lumirror film its characteristic crystal-clear transparency and excellent mechanical properties. Through biaxial orientation, the material is stretched in both longitudinal and transverse directions, leading to an optimal distribution of polymer chains and thus to superior performance characteristics.

The polyester film is available in various thicknesses from 1.4 µm to 500 µm, with each thickness offering specific properties for different applications. Standard widths are available, while custom dimensions can be realized depending on requirements. This flexibility makes Lumirror an ideal solution for a variety of industrial applications.

Properties and advantages of Lumirror polyester film

The exceptional properties of Lumirror polyester film make it a preferred material in numerous industries. Its high strength and stiffness enable its use in demanding applications where conventional films would reach their limits.

Mechanical properties

The mechanical strength of Lumirror is significantly above that of conventional plastic films. With tensile strength values between 18 and 24 kg/mm², the material offers exceptional load-bearing capacity. These values vary depending on thickness and orientation direction, with even thin films of 25 µm exhibiting remarkable tear resistance.

The tensile modulus of 400 kg/mm² surpasses alternative materials and ensures characteristic dimensional stability. This property is particularly important for precise applications in electronics and motor insulation, where even the smallest deformations can be critical.

Thermal and chemical resistance

An outstanding advantage of Lumirror polyester film is its excellent chemical and heat resistance, up to 150 °C for short periods. The operating temperature range extends from -70 °C to +150 °C, which opens up versatile application possibilities. This thermal stability makes the film ideal for applications exposed to extreme temperature fluctuations.

Its resistance to organic solvents, oils, and acids significantly expands the range of applications. In aggressive environments where other materials would fail, Lumirror retains its properties and ensures long-term reliability.

Electrical and optical properties

The excellent electrical insulation properties make Lumirror an excellent choice for electronic applications. Its low dielectric constant and high specific resistance ensure reliable insulation even at high voltages.

Optical clarity with minimal haze and high gloss is another crucial advantage. These properties, combined with UV resistance and aging resistance, make the polyester film ideal for long-term outdoor applications.

Film types & properties at Pütz Folien

The Lumirror range includes various special types optimized for specific applications. Each variant offers tailored properties for different industrial requirements.

Standard PET films (clear & hazy)

Standard hazy PET films

• Slightly milky or hazy appearance (“Haze”) due to light scattering
• Available in thicknesses from 4 to 250 µm
• Typical applications: electrical insulation, release liners, construction, safety applications, graphic arts industry, high-speed printing, adhesive tapes
• Variants with PCR/PIR content from 30% to 70%

Hazy PET films with high roughness

• Thickness: 36–125 µm
• Haze > 7%
• Applications: Release liners, siliconization, lacquering, coating, PSA tapes

Hazy PET films with low shrinkage

• Thickness: 50–125 µm
• Haze > 7.5%
• Low shrinkage at 150 °C (only 0.5% MD, 0.2% TD)
• Applications: RFID, electronics, flexible printed circuits, heat-resistant applications of all kinds

Clear & highly transparent PET films

Transparent films

• High transparency, Haze < 2%
• Different Surfaces and Coatings
• Typical thicknesses: 23–175 µm
• Applications: Packaging, graphic applications, labels

Highly transparent films

• Particularly smooth surface without “orange peel” effect
• Excellent optical quality, high transmission of UV-A light
• Available in 75–175 µm
• Applications: high-quality packaging, coatings, optical applications, high-precision printing applications, surface finishing

Specialty films

XTRM PVW (white, opaque PET film)

• Thicknesses: 50, 160, 170 µm
• Patented technology for photovoltaic backsheets since 2011
• Properties: high aging resistance, improved hydrolysis resistance, excellent opacity and light stability
• Applications: Solar panels (backsheets), durable outdoor applications

XTRM PVG (transparent PET film)

• Thicknesses: 50, 160 µm
• Very good long-term aging behavior
• One side without additives for better adhesion
• Applications: Solar panels, transparent layers

XTRM UVS

• Very thin transparent PET films (20–33 µm)
• Especially for UV-stable applications in the graphic arts sector
• Applications: Overlaminates, labels, adhesive applications

XCW (white PET film with high roughness)

• Thicknesses: 125, 190, 250 µm
• Improved Hydrolysis Resistance
• Very good processability due to high roughness
• Applications: Solar panels, electrical insulation, labels

Matte PET films

Matte to glossy

• Copolyester Base Material
• Thicknesses: 12 & 20 µm
• One side co-extruded (improved printability), one side sealable
• Satin or matte finish for high-quality print results

Matte

• Thicknesses: 50, 75 & 100 µm
• Permanently matted surface with high roughness
• Applications: Carrier films, release liners, matte surface transfers

White PET films

White films

• Milky opaque, high roughness
• UL94 VTM-2 & UL746B certified (RTI 105 °C)
• Thicknesses: 23–250 µm
• Applications: electrical insulation, release liners, mold release

White opaque high-gloss film

• White, opaque films with a glossy to high-gloss surface
• Printable variants (possible with up to 30% PCR content)
• Typical applications: Food packaging (lidding films), security printing, labels, laminations

Application areas and industries

The versatile properties of Lumirror polyester film enable its use in an impressive variety of industries and applications. From electronics to medical technology, the material has proven to be a reliable solution.

Electronics and electrical engineering

In the electronics and electrical engineering industry, Lumirror is an excellent choice for insulating motors, transformers, and cables. Its excellent dielectric properties in combination with thermal stability make the film ideal for high-performance applications.

Flexible Printed Circuits (FPC) benefit from dimensional stability and precise mechanical properties. The film retains its shape even under thermal cycles and mechanical stresses, which is crucial for the reliability of electronic systems.

Capacitors use Lumirror as a dielectric, where its constant electrical properties over a wide temperature range ensure precise capacitance values. Its long lifespan and aging resistance reduce maintenance costs and increase system reliability.

Automotive and industrial applications

The automotive industry uses Lumirror polyester film in flexible printed circuits (FPC) and membrane switches. Its resistance to chemicals and extreme temperatures makes the material ideal for the demanding automotive environment.

Membrane switches with Lumirror backing offer precise switching characteristics and durability. The combination of mechanical strength and flexibility enables millions of switching cycles without performance degradation.

LED lighting and optical systems

In LED lighting systems, Lumirror functions as a highly efficient reflective film for luminaires and light boxes. The special white variant (REF-White) maximizes light output and significantly improves the energy efficiency of lighting systems.

Its high reflection in combination with UV resistance ensures consistent performance over the entire lifespan of LED systems. This is particularly important for professional lighting applications where color consistency and light quality are crucial.

Packaging industry

As a high-quality packaging film, Lumirror offers excellent barrier properties and optical quality. Its excellent printability and laminability enable attractive packaging designs with functional properties.

Labels made from Lumirror are characterized by dimensional stability and weather resistance. These properties are particularly important for outdoor applications and industrial labeling, where durability is required.

Medical technology and pharma

Medical technology uses sterilizable Lumirror films for medical devices and packaging. Its resistance to sterilization methods such as steam, gamma radiation, and ethylene oxide makes the material ideal for critical medical applications.

Diagnostic devices benefit from special low-fluorescent variants that minimize background signals and improve measurement accuracy. This property is crucial for sensitive analytical procedures in laboratory diagnostics.

Furniture industry

In the furniture industry, Lumirror is used for decorative surfaces and lamination. The combination of optical clarity and mechanical resistance enables high-quality surface finishes that retain their quality long-term.

Its chemical resistance makes the film ideal for kitchen and bathroom furniture, where cleaning agents and moisture pose a challenge. The scratch-resistant surface ensures lasting aesthetics even with intensive use.

Processing and converting

The processing of Lumirror polyester film is carried out with state-of-the-art equipment and precise procedures to ensure the highest quality standards. Precise cutting on state-of-the-art systems enables exact dimensions according to customer requirements.

Converting options

Converting as roll goods offers maximum flexibility for continuous production processes. Standard rolls are available in various lengths and widths, while custom dimensions can be realized.

Rectangular cuts are produced with the highest precision to ensure an exact fit in end applications. The clean cut edges minimize the risk of damage during further processing.

Die-cut parts are also possible upon request.

Surface treatments and combinations

Delivery self-adhesive or non-adhesive on a roll significantly expands the application possibilities. Special adhesive systems are selected depending on the application to ensure optimal adhesion and long-term durability.

The combination with other materials through lamination opens up new functionalities. Multi-layer structures can offer specific properties such as increased barrier effect or electromagnetic shielding.

Corona or plasma treatments improve surface adhesion for printing inks and adhesives. These treatments are precisely tailored to the respective application to achieve optimal results.

Delivery and service

Short-term availability and fast delivery times are crucial factors for the economic viability of industrial projects. The established logistics network ensures reliable deliveries even for short-term requirements.

Technical consulting and support accompany the entire development and implementation process. Our sales team assists in selecting the optimal material variant and developing customized solutions.

Quality certificates and batch protocols document the properties of each delivery and enable seamless traceability. This documentation is particularly important for regulated industries such as medical technology and aerospace.

The continuous further development of new product variants ensures that Lumirror polyester film also meets future requirements. Innovative coatings and surface modifications continuously expand the range of applications.

Conclusion

Lumirror polyester film from Toray Industries represents the pinnacle of modern PET film technology. Its excellent combination of mechanical strength, thermal stability, and good processing properties makes it the ideal choice for demanding industrial applications.

The variety of available product variants makes it possible to find the optimal solution for a wide range of applications. From electronics to the automotive industry to medical technology – Lumirror has proven to be a reliable material that meets the highest quality standards.

Continuous innovation and the availability of customized solutions ensure that Lumirror polyester film also meets future technological developments. For companies that rely on the highest material quality, Lumirror offers the perfect basis for successful product developments.

If you have specific requirements for PET film or need technical advice on Lumirror products, you should contact Pütz Folien by email.