Material Characteristics:

Base Material: Polyester (PET) film

Adhesive: Silicone or acrylic adhesive

Features: High temperature resistance, insulation, chemical resistance, and good dimensional stability

Primary Applications:

Insulation for electronic components

Protective masking during wave soldering or reflow processes

Battery pack insulation

Fixing, shielding, and gasketing functions in electronics

Image-by-Image Analysis

Image 1: Rectangular Die-Cuts with Center Holes

Likely used for screen shielding, PCB insulation, or battery terminal isolation.

The central cut-out is probably for allowing certain component contacts while insulating the surrounding area.

Image 2: Clover-Shaped Stickers on Release Paper

This shape suggests use in multi-point fixation or cushioning, possibly for curved or irregular surfaces like inside mobile phones or other compact electronics.

Image 3: Multi-Circle Strips

These could be used for wire bundling, sensor alignment, or ventilation/thermal dispersion in layered assemblies.

The concentric circle patterns suggest flexible or modular applications.

Image 4: Complex Die-Cuts with Geometric Patterns

The intricate shapes suggest use in heat dissipation, ventilation, or vibration-dampening setups.

Possibly designed for layered application in multi-functional insulation zones.

Manufacturing Notes

These parts are likely produced via rotary die cutting or laser cutting.

The backing and adhesive system suggest clean removal without residue, which is critical for electronics manufacturing.

Shapes are typically customized to fit specific device components.

Summary

What you have here are custom die-cut adhesive insulation pieces made from (green PET tape), suited for thermal, electrical, or mechanical insulation in precise industrial applications—especially electronics manufacturing.