Silicone Polyimide Tape(K-620)
High-Temperature PI Film Tape with Silicone Adhesive for Wave Solder Masking, Powder Coating Masking, and Electrical Insulation
For Wave Solder Masking, Powder-Coating Masking & Electrical Insulation
Silicone Polyimide Tape is made with a polyimide (PI) film backing and a high-temperature silicone pressure-sensitive adhesive (PSA). It is used in high-temperature masking and electrical insulation applications where dimensional stability, heat resistance, and reliable adhesion are required, especially in PCB solder masking, powder coating masking, and selected electrical manufacturing processes.
Typical formats: small rolls, log/jumbo rolls, sheets, and die-cut parts for production.
Key Features & Benefits
High-temperature silicone PSA for demanding masking and electrical insulation processes
High-temperature masking capability for demanding process windows; suitability depends on peak temperature, dwell time, and process conditions. Please confirm with the TDS for your exact grade.
PI film backing provides excellent dimensional stability and electrical insulation at elevated temperatures
Good shear holding for secure masking and fixation during thermal cycles
Converting-ready supply: slitting, rolls, sheets, and die-cut shapes available
Standard color: amber/brown. Black polyimide tape for selected light-blocking applications may be available upon request
Typical Applications
PCB Assembly & Electronics
- Wave Solder and Solder Dip Masking:Used for masking pads, terminals, keep-out areas, and selected contact areas during PCB assembly.
- Gold Finger Protection:Suitable for selected gold finger and contact-area masking applications during wave solder processes.
- Rework and Reflow-Related Protection:Can be used for selected high-temperature masking in rework and solder reflow-related processes.
See our PCB Solder Masking Guide.
Powder Coating & Industrial High-Temperature Masking
- Powder Coating Masking:Used for masking parts during powder coating and paint curing cycles.
- High-Temperature Process Protection:Suitable for selected masking applications in industrial finishing processes requiring heat resistance and dimensional stability.
See our Powder Coating Masking Guide.
Motors, Transformers & Coils
- Coil Wrapping and Phase Insulation: Used for coil wrapping, loop packing, phase insulation, and outer insulation in motors and transformers.
- Wire and Lead Insulation: Suitable for wire wrapping, lead insulation, and selected barrier insulation applications.
- Fixation and Protection in Electrical Manufacturing: Used for part fixation, insulation reinforcement, and thermal protection in high-temperature electrical equipment.
See our Electrical Insulation Guide.
Silicone Kapton tape is commonly used for PCB masking, soldering protection, reflow support, and high-temperature electrical wrapping where heat resistance and controlled removal are important. For application checks, see our PCB solder masking guide and Electrical Insulation guide.
Technical Specifications
Typical values shown below are for reference only and should not be used as product specifications. Please request the official TDS for grade-specific values and test conditions.
| Ordering Code | Total Thickness | Adhesive | Adhesion to Steel | Tensile Strength | Elongation | Temp Rating | Dielectric Breakdown | Roll Length |
| K-620-60 | 0.06 mm | Silicone PSA | 6 N/25 mm | 50 N/10 mm | ≥ 80% | 260°C | ≥4.5 kV | 33 m |
| K-620-80 | 0.08 mm | Silicone PSA | 6 N/25 mm | 80 N/10 mm | ≥ 45% | 260°C | ≥6.0 kV | 33 m |
Typical test methods may include:
- Peel adhesion: ASTM D3330 or FINAT FTM-1
- Tensile strength / elongation: ASTM D3759
- Dielectric breakdown: ASTM D149
Silicone vs Acrylic Polyimide Tape
| Decision Factor | Silicone Polyimide Tape | Acrylic Polyimide Tape |
| Best for | Higher-temperature masking windows & solder masking | Non-silicone requirements, general electrical tape use cases |
| Temperature positioning | Often selected for higher-temperature masking profiles and solder masking applications
| Commonly used in lower-temperature Class F or similar process windows, depending on grade |
| Contamination sensitivity | Some customers restrict silicone in coating/bonding lines | Non-silicone acrylic grades are often used to reduce silicone contamination risk |
| Cost trend | Often higher for high-temp silicone PSA systems (depends on thickness/volume/converting) | Often lower for general acrylic PSA systems (depends on spec) |
Quick recommendation:
Choose silicone PI tape when your masking window includes higher peak temperatures or solder masking tasks.
Choose acrylic PI tape when your process has a strict “no silicone” requirement or your temperature window fits acrylic grades.
Common Failures to Avoid in Solder Masking
To reduce rework and scrap in wave solder masking, watch for these common issues:
- Edge Lift → Solder Leakage
Cause: insufficient surface preparation, incorrect tape width, or an overly aggressive thermal profile.
Prevention: clean and dry the substrate, apply firm pressure, and choose the correct thickness and masking geometry. - Adhesive Transfer After Heat Aging
Cause: excessive dwell time at high temperature, low-surface-energy substrates, or improper peel angle.
Prevention: validate the tape grade for your dwell time, peel slowly at a low angle, and run sample trials before production. - Mis-Masking Due to Dimensional Drift
Cause: masking materials with poor dimensional stability.
Prevention: use polyimide film constructions with stable backing and select the correct converting tolerance.
Converting & Customization
- Custom slitting to required widths
- Rolls, sheets, log rolls, and jumbo rolls
- Die-cut parts including dots, discs, sheets, and custom shapes
- OEM packaging and private label support
- Samples available for evaluation; scalable supply for long-term projects
Quality, Documentation & Traceability
- Incoming inspection of key raw materials, including PI film and silicone adhesive system
- In-process control for thickness, adhesion, and appearance consistency
- Lot traceability for repeatable production
- Technical documents available upon request.
Downloads
Download TDS (PDF)
View All Datasheets
Request a Quote:
FAQ
Why choose silicone polyimide tape instead of acrylic polyimide tape?
Can silicone polyimide tape be used for wave solder masking?
Will it remove cleanly after high-temperature exposure?
How do I choose thickness (mil) for masking?
Will silicone adhesive affect painting/coating/bonding processes?
Need custom widths, wholesale rolls, or factory-direct supply?
Learn more about our Polyimide Tape Manufacturer capability for PCB masking, FPC assembly, and electrical insulation.
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Comparison Articles – Product comparisons and feature analysis
Troubleshooting – Common issues and solutions
