MTE Solutions Conformal Coating Masking Dots/Discs Rubber Adhesive Discs, 1 ML Variety of Sizes
MTE Solutions Conformal Coating Masking Dots/Discs Rubber Adhesive Discs, 1 ML Variety of Sizes
MTE Solutions conformal coating masking dots provide die-cut circular masks for defined PCB keep-outs. The existing product specification identifies yellow polyester film with rubber adhesive, a 1 mil backing, and 2.5 mil total thickness. Select the diameter for the drawing's required boundary and validate adhesion, coating exposure, and removal on the actual assembly.
The legacy URL contains polyimide, but the listed construction for this conformal-coating product is polyester. Confirm the supplied material specification when qualifying an order; URL wording is not a material certification. Select the required size above and confirm package quantity when ordering.
Best Uses / Applications
- Circular contact areas and test points that the assembly drawing identifies as coating keep-outs.
- Repeat masking operations where a die-cut diameter can reduce hand-cutting variation.
- PCB coating process trials evaluating adhesive compatibility and de-masking quality.
- Other masking operations only after validating the full chemical and thermal exposure.
Listed Product Specifications
The following values are retained from the existing catalog specification. Obtain the applicable supplier documentation for process approval; these values do not establish universal compatibility.
| Brand | MTE Solutions |
|---|---|
| Listed film | Yellow polyester film; yellow/clear liner |
| Listed adhesive | Rubber; described in the catalog as silicone-free |
| Backing thickness | 1 mil; ASTM D-3652 |
| Total thickness | 2.5 mil; ASTM D-3652 |
| Adhesion to steel | 35 oz/in; ASTM D-3330 |
| Tensile strength | 16 lb/in; ASTM D-3759 |
| Elongation | 100%; ASTM D-3759 |
| Dielectric strength | 4,500 V; ASTM D-149 |
| Catalog temperature range | 0°F to 266°F; upper endpoint 130°C. Confirm allowable exposure duration and actual application. |
| Available diameters | 3/16, 1/4, 5/16, and 3/8 inch |
Key Features and Process Selection
Die-cut geometry supports consistent sizing. The listed rubber adhesive is an option to evaluate where a non-silicone adhesive is specified. This does not guarantee a contamination-free or residue-free assembly. Surface condition, dwell, coating solvents, temperature, and removal technique still require qualification.
Dots vs. Tape and Liquid Mask
| Method | Starting application | Check before approval |
|---|---|---|
| These circular dots | Defined round keep-outs | Diameter, positioning, edge sealing and complete removal |
| Masking tape | Linear boundaries and flat areas | Backing, adhesive, overlaps and removal damage |
| Peelable liquid mask | Irregular geometry | Cure, coating compatibility and access for peeling |
Frequently Asked Questions
Are these polyester or polyimide?
The existing specification for this product identifies polyester film. The legacy URL uses polyimide wording. Confirm the applicable supplier specification for the supplied material rather than inferring construction from the URL.
Does silicone-free mean no coating defects?
No. The catalog describes a silicone-free rubber adhesive, which addresses one material-selection consideration. It does not eliminate other contamination sources, residue, poor adhesion or coating-process defects.
How do I choose a diameter?
Use the required uncoated boundary and placement tolerance from the drawing. Check that the dot covers the intended feature without covering neighboring areas that need coating.
Can I use these for wave soldering or powder coating?
Do not approve those processes from the generic temperature range alone. Confirm the actual exposure, duration, substrate and supplier qualification evidence. No universal suitability for a soldering or powder-coating cycle is established here.
Are these a guaranteed replacement for another supplier's dots?
No interchangeability guarantee is made. Compare the exact film, adhesive, dimensions, exposure limits and removal performance before qualifying a replacement.
Are custom sizes available?
The existing catalog offers custom sizes on request. Contact us with the required dimensions and application details to confirm availability.
