MTE Solutions Polyimide Dots/Discs Rubber Adhesive Discs, Mustard Color, Variety of Sizes 1000 Discs/Roll
MTE Solutions Polyimide Masking Dots/Discs, Mustard Color, 1.5 Mil Silicone Adhesive, 1,000 Discs/Roll
MTE Solutions polyimide masking dots are die-cut discs made from mustard-color polyimide film with a 1.5 mil silicone adhesive backing, designed for high-temperature masking applications up to 500°F (260°C). They are widely used for masking printed circuit boards (PCBs) during wave soldering, reflow soldering, and conformal coating, as well as for masking threaded holes, connectors, and precision surfaces during powder coating and paint operations. The silicone adhesive bonds securely during processing and releases cleanly without adhesive residue. Available in 5/8" and 3/4" diameters; custom sizes and shapes available on request.
Sold in rolls of 1,000 discs.
Specifications
| Brand | MTE Solutions |
|---|---|
| Material | Polyimide film (Kapton®-type), mustard color |
| Adhesive | 1.5 mil silicone |
| Max Temperature | 500°F (260°C) |
| Available Diameters | 5/8" (SKU: 380-PD-0625), 3/4" (SKU: 380-PD-0750) |
| Quantity | 1,000 discs/roll |
| Adhesive Residue | Clean removal — no adhesive residue after processing |
| Custom Sizes | Available on request |
| Application | PCB masking (wave solder, reflow, conformal coating), powder coating masking, paint masking, connector and hole masking |
Frequently Asked Questions
What are polyimide masking dots used for?
Polyimide masking dots are used to protect specific areas of a PCB or metal part during high-temperature processing. On PCBs, they mask gold contacts, connectors, test points, and component areas that must not be exposed to solder, flux, or conformal coating. In powder coating and paint operations, they mask threaded holes, precision bores, mating surfaces, and any area that must remain uncoated. The polyimide film withstands the high temperatures of these processes while the silicone adhesive holds the disc in place and releases cleanly afterward.
What is the maximum temperature these discs can withstand?
MTE Solutions polyimide masking dots are rated for continuous use up to 500°F (260°C), making them suitable for wave soldering (typically 500°F peak), reflow soldering ovens, and powder coating cure ovens (typically 350–450°F). Always verify your specific process temperature against the disc rating before use.
Will the silicone adhesive leave residue after removal?
No. The 1.5 mil silicone adhesive is formulated for clean removal after high-temperature processing. Unlike acrylic adhesive tapes that can leave residue or bond permanently at elevated temperatures, silicone adhesive maintains its release properties through the full temperature range, leaving the masked surface clean and residue-free.
Are custom sizes available?
Yes. MTE Solutions offers custom sizes and shapes for polyimide masking dots and discs. Contact us with your required dimensions and we can provide a quote for custom die-cut polyimide masking products.
