Polyimide Kapton Tape and Dots
Polyimide Kapton Tape and Dots
Polyimide Kapton tape and dots are high-temperature masking materials used in electronics manufacturing, PCB assembly, wave soldering, reflow soldering, and conformal coating processes. Made from DuPont Kapton polyimide film with a silicone adhesive backing, these tapes withstand continuous temperatures up to 260°C (500°F) without adhesive bleed, delamination, or residue — making them the standard masking solution for heat-intensive assembly operations. MTE Solutions offers polyimide tape and dots under the MTE brand at competitive pricing.
Frequently Asked Questions
What is polyimide Kapton tape and what are its key specifications?
Polyimide tape — commonly called Kapton tape after DuPont’s trademarked film — is a thin, amber-colored tape made from polyimide film with a silicone pressure-sensitive adhesive. Key specifications include a continuous service temperature of up to 260°C (500°F), excellent dielectric strength (typically 7,000–8,000 V/mil), low outgassing, and chemical resistance to most solvents used in electronics cleaning. The silicone adhesive leaves no residue after removal, which is critical for masking applications where adhesive contamination of PCB surfaces or contacts would cause failures. MTE Solutions polyimide tape and dots are available in multiple widths and sizes to fit standard masking applications.
What are polyimide Kapton dots used for?
Polyimide dots are pre-cut circular discs of the same polyimide film and silicone adhesive used in Kapton tape. They are used to mask specific points on a PCB — such as test points, vias, connector pads, and component leads — during wave soldering, selective soldering, conformal coating, and powder coating operations. Using pre-cut dots eliminates the need to cut tape by hand for round or small masking areas, improving consistency and reducing masking time on the production line. Dots are available in a range of diameters to match standard pad and via sizes.
How is polyimide tape used in wave soldering and reflow processes?
In wave soldering, polyimide tape is applied to areas of the PCB that must be protected from solder contact — including gold fingers, edge connectors, SMD components on the top side, and areas reserved for post-solder assembly. The tape withstands the solder wave temperature (typically 250–260°C) without lifting, burning, or leaving adhesive residue. In reflow soldering, tape is used to mask heat-sensitive components or areas where solder paste must not flow. After soldering, the tape peels cleanly without requiring solvents or leaving contamination that could affect electrical performance.
How do I select the right width and format — tape roll vs. dots?
Choose tape rolls for masking linear features such as edge connectors, board edges, and rows of contacts where a continuous strip can be applied efficiently. Choose dots for masking discrete circular features — test points, vias, and round pads — where cutting tape by hand would be imprecise or time-consuming. For high-volume production, pre-cut dots on a release liner significantly reduce masking labor. Width selection for tape should match the feature being masked as closely as possible — oversized tape increases material waste and may cover adjacent areas unintentionally. Browse MTE Solutions polyimide tape and dot sizes to find the right format for your application.
