About Films

xxPolyonics manufacturers tapes, label materials and flexible substrates that include polyimide (PI), polyester (PET), Nylon, aluminum, polyethylene naphthalate (PEN), polyetherimide (PEI), polyether ether ketone (PEEK), and Nomex films. The films are specifically selected for their ability to survive harsh environments including high temperatures and exposure to chemicals. The materials continue to protect, mask, identify, insulate, isolate and bond heat and static sensitive devices as well as help prevent the propagation of fire.

The film portion of the construction is a major factor in determining the material’s overall physical properties. These include tensile strength, thermal, UV, chemical and electrical resistances, thermal conductivity, surface roughness, dimensional stability, stiffness, ease of die cutting, etc. Depending on the type of film used and the application, it can account for up to 70% of the overall product cost with higher performances relating to higher film costs.

The three most popular materials used in the Polyonics product lines are PI, PET and aluminum.

PI is the primary film used by Polyonics due to its superior performance in harsh environments. Polyimide has the ability to remain dimensionally stable at temperatures up to 500° C (1000°F) as well as to resist prolonged exposures to chemicals typical of the PCB manufacturing process. PI is also a highly rated flame retardant material.

PI films are available in amber and semi gloss black. The films must be coated with an opaque top-coat for printing applications such as high resolution bar codes on PCB labels. PI is available in 13µm (0.5mil) to 125 µm (5mil) thicknesses.

PET is a more economical film than PI and has lower performance values as well. PET is available in white or clear and in 25µm (1mil) and 50µm (2mil) thicknesses. It’s rated for 300°C (572°F), has a lower dielectric strength, is less dimensionally stabile and offers a lower UL94 flame retardant rating.
Aluminum is available in 50µm (2mil) thicknesses and is applicable to a wide array of applications that require prolonged exposure to extreme temperatures. These include tags, labels and tapes for use on furnaces and in foundries and low temperature, cryogenic labels, etc. Additional tape applications include vapor barriers, RFI and EMI absorption and isolation, heat radiation and high temperature fire prevention.

Label Material
Operating Temperature F (C°)
Short-term Temperature F (C°)
Vinyl or PolyVinyl Chloride (PVC)
165° (74°)
General purpose film; excellent moisture, solvent, abrasion & smudge resistant and outdoor durability. Flexible, tamper evident, flame retardant; available in various colors.
175° (79°)
Thermoplastic with hard, rigid surface. Material is unaffected by moisture; typically used on timber tags- stapled to the end of finished timber. Also available in a brittle tamper-evident version.
200° (93°)
Low cost synthetic, commonly used for general purpose and economy label solutions. Better solvent/chemical resistance than paper. Used mostly in indoor applications
212° (100°)
Typically less expensive than film, provides limited resistance to moisture, temperature, and chemicals. Generally used for short-term indoor applications
Tedlar (or PVF, Polyvinylfluoride)
225° (107°)
375° (191°)
Has excellent flame retardant properties, as well as extraordinary resistance to UV. Highly chemical resistant and expensive. Widely used in wire and cable marking applications
Polycarbonate *(Lexan)
250° (121°)
Low temperature material, used in network identification and is a flame retardant material.
Polypropylene (PP)
300° (149°)
Excellent substitute for Vinyl labels. Hard & rigid to the touch. Stretches in only one direction. Designed for 6 months outdoor exposure. Resistant to blood, alcohol and oils.
Polyester (PET)*
325° (163°)
400° (204°)
Tough, high performance film provide excellent outdoor durability, chemical & heat resistance. Displays excellent dimensional stability and high tensile strength. Popular applications include rating plates and fixed asset identification..
polyethylene naphthalate (PEN) *
400° (204°)
Moderate stiffness, stretches in all directions, but will tear quite easily. Designed for 6 months outdoor use. Useful for labeling products that expand and contract.
Polyetherimide *
450° (232°)
High temperature & chemical resistance, superior tensile strength and tear resistance. Unaffected by process used in PCB application. Recent problem with availability
Kapton (Polyimide) *
500° (260°)
Dupont's trade name for Polyimide. Very tough material, provides highest level of performance to meet the most challenging applications. Extremely high temperature & chemical resistance, superior tensile strength and tear resistance.
Aluminum Foil *
700° (371°)
1112° (600°)
Long term heat exposure, alternative cheaper label construction for high temperature solutions
850° (454°)
used for extreme applications where conventional labels are not durable enough.

* Materials offered at Polyonics.

Polyonics, Inc.

28 Industrial Park Drive
Westmoreland N.H. 03467
Ph: +1.603.352.1415
Fax: +1.603.352.1936
Email: [email protected]

Polyonics products are intended for industrial use only

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Polyonics, Inc.

Rm. 1804 Gaosheng Commercial Mansion
HongTu Rd. Nancheng
Dongguan, Guangdong, China 523082
Phone: 86.755.8825.0441
Fax: 86.755.8825.2429
Email: [email protected]