1. Mainstream self-fluxing/self-adhesive layer materials (sorted by common usage)

1. Polyamide (PA, the most commonly used)

Type: aliphatic polyamide, aromatic polyamide (high temperature resistant)

Characteristics: High bonding strength, good heat resistance, high resoftening temperature; partial moisture absorption

Heat resistance level: 155℃, 180℃, 200℃+

Application: motors, voice coils, high-frequency coils, automotive electronics

2. Polyvinyl butyral (PVB, traditional classic)

Characteristics: good processability, low cost, easy welding; moderate heat resistance

Heat resistance: 130℃ (Class B)

Application: Miniature air-core coil, RFID, ordinary voice coil

3. Polyester / Modified polyester

Characteristics: Resistant to wet adhesion, solvent-resistant, suitable for ultrasonic/electrical heating

Heat resistance: 155℃

Application: Implantable coils, household appliances, precision windings

4. Epoxy resin (thermosetting)

Characteristics: High heat resistance, good strength, non-re-softening; requires strong heat/electricity for curing

Heat resistance: 180℃+

Application: High reliability, high temperature, vibration-resistant coil

5. Others (niche/specialty)

Polyvinyl formal (PVF), phenolic modification, water-based self-adhesive paint, etc