In the assembly and production of electronic components, Mylar Tape is a frequently used industrial consumable. This thin yet tough tape can be found in everything from high-performance transformers and lithium battery packs to precision circuit boards.
Definition and Core Material of Mylar Tape
Acrylic pressure-sensitive or flame-retardant adhesive is applied on biaxially oriented polyethylene terephthalate (BOPET) film, which serves as the basis material for Mylar Tape, sometimes referred to as Polyester Film Tape in academia.
Why was Mylar selected as the basic material?
The premium polyester film known as Mylar was created and has the following physical attributes:
Extremely high dielectric strength: Even at extremely thin thicknesses, it can tolerate high voltages of thousands of volts.
Excellent mechanical strength: Strong tensile strength, not easily torn or punctured.
Dimensional stability: Maintains its physical shape even in a working environment of 130℃, without thermal shrinkage.
Core Functions of Mylar Tape in Electronics Manufacturing
As a purchasing or design engineer, understanding its functions helps in making better choices in the Bill of Materials (BOM):
Electrical Insulation and Dielectric Strength:
This is the most basic function of Mylar tape. In transformer coil windings, it is used for interlayer insulation.
Technical data: Standard 0.025mm thick Mylar tape typically has a breakdown voltage of over 5.0kV.
High-Temperature Barrier (Class B Insulation Rating):
Electronic devices generate a lot of heat during operation. Mylar tape usually meets the UL Class B (130℃) insulation rating, protecting circuits in high-temperature environments for extended periods, preventing adhesive leakage or material carbonization.
Physical Protection and Bundling:
Mylar tape is frequently used in the manufacturing of lithium batteries to bundle battery cells and insulate electrode edges. It successfully stops electrolytic corrosion of the interior structure because it is resistant to acids, alkalis, and chemical solvents.
Tamper-evident and color-coded:
There are several different colors of Mylar tape (yellow, black, green, blue, transparent, and white).In complex circuit layouts, engineers use different colors to distinguish different circuit modules or voltage levels.
Technical Parameter Quick Reference Table
| Parameter (Properties) | Typical Values | Standard |
| Total Thickness | 0.055 mm ± 0.005 | ASTM D3652 |
| Dielectric Breakdown | ≥5.5 kV | ASTM D149 |
| Tensile Strength | ≥ 45 N/10mm | ASTM D3759 |
| Flammability | UL 510 Certified | UL 510 |
| Temperature Resistance | -40℃ to 130℃ | --- |
How to identify high-quality Mylar tape?
As a professional supplier, we recommend testing from the following three dimensions:
Adhesive residue test:
Apply the tape to a stainless steel plate and bake at 130℃ for 2 hours. After removal, there should be no adhesive residue on the surface.
Dielectric breakdown consistency:
Randomly select different locations on the tape for high-voltage testing to ensure that the breakdown voltage fluctuation is within 10%.
Flame retardant certification:
Check if the supplier can provide a genuine UL Yellow Card.
Mylar tape is not just a tape; it's an "invisible protective umbrella" for the safe operation of electronic products. In today's pursuit of miniaturization and high reliability, choosing Mylar tape that meets UL standards and has stable physical properties is crucial.
