Black Matte PC Insulation Mylar Film Protection Board Fireproof High Temperature

A black matte PC insulation Mylar film die cut as the insulating membrane for lithium battery protection boards. The part sits between the protection board PCB and the aluminum shell, heatsink or pack frame, isolating the board and its MOSFET tabs from the metal body. The matte black surface is the defining feature: it suppresses reflection and light spill inside a sealed pack, and it takes clean laser marking, so board model, batch code and polarity marks can be marked directly onto the film instead of a separate label. Because the protection board runs next to the cells, the film is made from flame retardant polycarbonate that is both fireproof and dimensionally stable at high temperature, and it is cut with screw holes, connector windows and edge relief to match the board outline.

• Black matte surface finish — low reflectivity and anti glare, hides board layout, and gives high contrast for laser marking of model and batch codes.
• Protection board dedicated profile — die cut to the BMS / PCM board outline with screw holes, connector windows and edge relief at +/-0.1mm.
• Fireproof polycarbonate film — UL94 V-0 flame retardant, self-extinguishing, no dripping next to the cells and MOSFETs.
• High dielectric strength — above 30 kV/mm, isolating the board and MOSFET tabs from the aluminum shell.
• High temperature stable — -40°C to 140°C, keeps flat and does not yellow or shrink during pack assembly and service.
• Clean matte cut edge — burr free edges avoid scratching the PCB solder mask or the aluminum shell during fitting.

The base material is a biaxially stretched PET polyester film produced from dimethyl terephthalate and ethylene glycol by ester exchange and vacuum polycondensation. The following typical property values apply to both the flame retardant series and the standard series.

Reference standards: ISO 1183, ASTM D1003, ASTM D570, ISO 527, ISO 178, ISO 306, ISO 11359, IEC 60250, IEC 60243, IEC 60093, UL 94 / UL Bulletin 94. The above figures are typical values obtained under standard test methods and are not a guarantee of performance under unstable application conditions. Test reports for each batch are available on request.

• Lithium battery BMS and PCM protection board insulation
• Cylindrical and prismatic battery pack internal isolation
• Power tool, e-bike and scooter battery packs
• Portable power stations and household energy storage modules
• Drive power supplies, inverters and controllers
• Transformer, cable and terminal insulation

• Board level precision — we cut from your BMS board drawing, including small connector windows and 2mm screw pads, at +/-0.1mm.
• Matte finish control — consistent matte gloss level across batches, so laser marking contrast is identical order after order.
• Free samples in 3-5 working days — standard thickness sample, custom die cut sample in 7 days for an assembly trial.
• Export service — FOB / CIF / EXW, T/T, L/C and Western Union, flat carton packing to keep sheets warp free.