When it comes to high-temperature masking and insulation tapes, two materials often dominate the market: PET (Polyethylene Terephthalate) tape and Polyimide (PI) tape, commonly known as Golden Finger Tape. Understanding their properties can help manufacturers select the right tape for their specific needs.

What Is PET High Temperature Tape?
PET tape features a polyester film backing with a heat-resistant adhesive. It typically withstands temperatures up to 200–220°C and offers excellent mechanical strength and chemical resistance.

What Is Polyimide (PI) Tape?
PI tape is made from polyimide film, known for its exceptional thermal stability, often resisting temperatures up to 260°C or higher. It is thinner and more flexible than PET tape and is widely used in electronics and PCB manufacturing.

Key Differences Between PET and PI Tape
Feature | PET Tape | PI Tape (Golden Finger Tape) |
---|
Max Temperature | Up to 220°C | Up to 260°C and beyond |
Thickness | Usually thicker (up to 50 microns) | Ultra-thin options (down to 12 microns) |
Flexibility | Moderate | Highly flexible and conformable |
Chemical Resistance | Good | Excellent |
Electrical Insulation | Good | Superior |
Peel Cleanliness | Good | Excellent, residue-free |
Typical Applications | Powder coating, masking, insulation | PCB masking, battery tab protection, electronics assembly |
When to Choose PET Tape?
• Applications involving moderate high temperatures
• Surface protection in powder coating or painting
• Masking in battery manufacturing where thicker tapes provide durability
• Situations requiring cost-effective and robust tape

When to Choose PI Tape?
• Electronics assembly requiring ultra-thin, flexible tape
• High temperature soldering (up to 260°C) or reflow processes
• Battery tab protection (Golden Finger Tape)
• Applications demanding superior electrical insulation

Lvzhimei Offers Both Solutions
Lvzhimei provides a wide range of PET and PI tapes, ensuring customers get customized solutionsfor their industry’s unique challenges. Our technical team can help select the best tape based on:
• Temperature requirements
• Mechanical stress and flexibility
• Electrical insulation needs
• Production process compatibility

Final Thoughts
Both PET and PI tapes have their place in high-temperature manufacturing environments. The key is matching tape properties to your application’s technical demands and budget considerations.