PI silicone tape
High-temperature masking tape is mainly used in the electronics industry, with temperature resistance performance typically ranging between 120℃ and 260℃. It is commonly used for masking in electroplating, powder coating, and painting processes, as well as for fixation in the manufacturing of electronic components, and masking of printed circuit boards (PCBs) during high-temperature processing. Types of high-temperature masking tape include polyimide high-temperature tape, high-temperature masking paper tape, and polyester green high-temperature tape, among others.
Detailed description
Golden yellow high-temperature tape uses PI (polyimide) film as the base material, coated with high-temperature resistant silicone pressure-sensitive adhesive. It is suitable for masking in electroplating, painting, and powder coating processes, with no residual adhesive left after removal at high temperatures.
Related Specifications
| Series | Product code | Adhesive | Material | Standard size) | Tack (N) | Adhesion (N/25mm) | Tensile strength (N/25mm) | Temperature resistance (℃) | ||
| Thickness (mm) | Width (mm) | Long (m) | ||||||||
| PI silicone tape | KA06 | Silicone | PI | 0.06 | 500 | 33 | 1↑ | 6↑ | 115↑ | 250 |
| PI silicone tape | KA08 | Silicone | PI | 0.08 | 500 | 33 | 4↑ | 6↑ | 115↑ | 250 |
FAQ
Lens Protection Tape Series
Specialized for encapsulating resin eyeglass lenses during high-temperature curing processes. Key features include high transparency, residue-free removal, and heat resistance up to 130°C (e.g., JT8860 for blue-light-blocking lenses)
Lithium Battery Tape Series
Includes termination tapes (for electrode insulation), PACK tapes (bundle fixation), and tab lead tapes (welding point protection). Made from PI/PET films with electrolytic corrosion resistance, critical for cylindrical/pouch cell safety
LED Encapsulation High-Temperature Tape Series
Designed for LED epoxy resin filling and curing (e.g., MY68C transparent tape for digital tubes). Withstands 150–180°C, prevents overflow, and leaves no residue after peeling
Connector Tapes Series
Insulating tapes for electronic connectors and terminals, ensuring stability in soldering (reflow peak: 260–300°C). Commonly uses PI films for dielectric strength
Insulation & Fixation Tapes Series
Glass fiber-reinforced tapes for coil binding in motors/transformers, offering mechanical strength and flame retardancy (180–220°C continuous use)
High-Temperature Double-Sided Tape Series
Features acrylic/silicone adhesives on PI/PET bases. Used for bonding heat sinks, battery modules, and composite materials, withstanding 120–180°C long-term
Masking Tapes Series
Includes high-temp masking paper and PET green tapes for spray painting, powder coating, and PCB gold finger protection. Resists solvents, leaves sharp edges, and operates at 150–230°C
Teflon Tape Series
PTFE-based tapes with ultra-low friction and 260–300°C continuous resistance. Applied in non-stick industrial conveyors, food packaging seals, and chemical equipment lining
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PI silicone tape is often better known as “Kapton tape” or “Gold Finger Tape.” It is a high-temperature tape made with a polyimide (PI) film backing and coated with a high-performance silicone pressure-sensitive adhesive.
Because the PI film itself is typically amber (brown or golden), the tape appears golden, hence the nickname “Gold Finger Tape.”
The core characteristics of PI silicone tape (also known as Kapton gold finger tape) can be summarized as four “superior” features, which make it an irreplaceable position in the demanding high-tech and industrial fields:
1. Extreme Temperature Resistance
This is PI tape’s most prominent and core feature, and the key that sets it apart from ordinary high-temperature tapes (such as green PET tape).
Specific features:
Long-term operating temperature: It can operate stably at temperatures up to 260°C (500°F) without failure.
Short-term temperature resistance: It can withstand transient high temperatures exceeding 300°C, even as high as 400°C (for example, a few minutes in a reflow oven).
Low-temperature resistance: It also exhibits excellent low-temperature resistance, maintaining its flexibility in extremely cold environments exceeding -100°C.
Why it’s key: Many cutting-edge manufacturing processes (such as reflow soldering and transformer varnish drying) exceed 220°C, making PI tape the only reliable option.
2. Superior Electrical Insulation
PI tape is a top-tier insulating material, with performance far exceeding that of other plastic films.
Specific Features:
High dielectric strength: A very thin layer of film can withstand thousands of volts without breakdown.
Stable performance at high temperatures: Crucially, its insulation performance degrades minimally at high temperatures, providing continuous and reliable Class H or Class C insulation protection for equipment that generates heat during operation, such as motors and transformers.
Why it’s key: PI tape is an ideal solution for miniaturized, highly integrated electronic components that require both high-temperature resistance and reliable electrical isolation, such as in the insulation wrapping of lithium battery tabs.
3. Excellent Dimensional Stability
This ensures its accuracy during precision machining.
Specific Performance: PI film has a very low coefficient of thermal expansion and contraction, whether at extremely high or low temperatures. It virtually avoids stretching, curling, or deformation due to sudden temperature fluctuations.
Why It Matters: When masking tiny gold fingers or delicate circuits, deformation of the tape can lead to masking failure. PI tape’s dimensional stability ensures absolutely clear masking edges and precise positioning.
4. Robust Overall Resistance
In addition to heat resistance and insulation, it also offers comprehensive protective properties.
Specific Performance:
Chemical Corrosion Resistance: Resistant to most industrial solvents, acids, alkalis, oils, and cleaning agents.
High Mechanical Strength: Despite its thinness, it offers exceptional stretch, tear, and puncture resistance, making it unbreakable.
Radiation Resistance: Excellent resistance to ionizing radiation, including alpha, beta, and gamma rays, makes it suitable for use in the nuclear and aerospace industries.
Why it’s key: This enables PI tape to provide reliable protection in a variety of complex and harsh industrial environments, from chemical processing tanks to space radiation environments.
The material composition of PI silicone tape (Gold Finger Tape/Kapton Tape) is very specific and well-defined. It is a composite of two high-performance core materials:
1. Backing Material: Polyimide Film (PI)
This is the amber (golden) film that forms the bulk of the tape.
Material Name: Polyimide. This is a top-notch polymer known for its excellent thermal stability and electrical properties.
Industry Synonym: In the industrial field, Kapton® brand PI film produced by DuPont™ is the most well-known, and therefore “Kapton Tape” has become synonymous with PI silicone tape. Therefore, high-quality PI tape backing material refers to Kapton®-grade polyimide film.
Why Choose PI Film?
Extremely High Temperature Resistance: Its glass transition temperature, with a melting point above 400°C, makes it an ideal substrate for ultra-high temperature resistance.
Top-tier insulator: Recognized as one of the highest-performing film insulation materials.
Stable Performance: Maintains excellent physical and electrical properties over a wide temperature range (-269°C to +400°C).
Chemically Inert: Inert to most chemicals and not susceptible to corrosion.
2. Adhesive: High-Performance Silicone Pressure-Sensitive Adhesive
This is the adhesive applied to the PI film.
Material Name: Silicone Pressure-Sensitive Adhesive.
Why Silicone?
Matched Temperature Resistance: Silicone is the only pressure-sensitive adhesive system that matches the temperature resistance of PI film. While conventional acrylic adhesives or rubbers rapidly age and fail above 150°C, high-performance silicone maintains stable adhesion above 260°C.
Clean Removal: Another core advantage of silicone. Even after high-temperature baking, it can be cleanly peeled from the surface it’s bonded to, leaving no adhesive residue. This is crucial for precision electronics manufacturing.
Chemical Stability: Like PI film, it also exhibits excellent chemical resistance.
It can be considered an “expert” tool for solving bonding, masking, and insulation problems in “extreme environments.”
The following are its main application areas:
1. Electronics & Electrical Industry
This is the core and most extensive application market for PI tape.
Printed Circuit Board (PCB) Manufacturing and Assembly:
Gold Finger Protection: This is its most classic application. During wave soldering or reflow soldering, it is used to protect the “gold fingers” (i.e., connector contacts) on the edge of the PCB board, preventing contamination and oxidation in high-temperature solder baths exceeding 260°C. After soldering, it can be removed without leaving any adhesive residue.
SMT Process Masking: During the SMT process, it is used to mask specific components, pads, or vias on the PCB to protect them during reflow or selective soldering.
High-End Motor, Transformer, and Coil Insulation:
As an H- or C-class insulation material, it is used to wrap and secure coils and lead wires within motors, transformers, relays, and other components. It provides long-term, stable, and reliable electrical insulation against short circuits even at high temperatures generated during operation.
Flexible Printed Circuit (FPC) Applications:
During the FPC production and assembly process, it is used for temporary fixation, reinforcement, or as an insulating layer.
2. New Energy Sector
PI tape is a key auxiliary material, particularly in lithium battery manufacturing.
Lithium Battery Insulation Wrapping:
Tab Wrapping: Used to wrap the positive and negative tabs (tabs) of lithium battery cells, providing insulation and protection to prevent internal short circuits caused by friction or contact.
Cell Fixing and Termination: In wound battery cells, it is used as a termination tape to secure the ends of the cells; it is also used for bundling and securing prismatic battery cells.
3. Aerospace & Automotive Industry
In these areas where reliability is paramount, PI tape is used to protect critical electronic components.
High-Temperature Area Wire Harness Wrapping: It is used to bundle and protect automotive or aircraft wiring harnesses near high-temperature areas such as the engine and exhaust system, providing insulation, abrasion resistance, and high-temperature resistance.
Sensor and Electronic Module Protection: It is used to secure, insulate, and protect various precision sensors and electronic control modules (ECUs).
4. Other High-Tech Applications
Semiconductor Manufacturing: It is used as a temporary masking material for high-temperature and chemical resistance during certain process steps in chip manufacturing.
3D Printing: Many high-end or professional FDM 3D printer users apply PI tape to the heated bed surface. Because it’s extremely durable, it can withstand repeated heating and cooling cycles and provides a smooth, well-adhesive printing surface for printed parts.
High-temperature powder coating or baking: PI tape is often used in place of green PET tape in specialized coating applications where masking accuracy and temperature resistance are extremely critical (for example, when masking very fine areas or baking temperatures exceeding 220°C).