Conformal Coating Masking Solutions

Masking is a critical step in conformal coating, preventing coating ingress into connectors, test points, keep-out zones, and other defined areas on electronic assemblies.

The right masking approach improves first-pass yield, reduces rework, and supports consistent coating quality — especially in high-mix or regulated manufacturing environments.

SCH masking products are selected for:

• Reliable adhesion during coating and curing
• Clean edge definition for sharp mask boundaries
• Residue-free removal after processing
• Consistent performance across batches

We supply masking formats in paper-based and high-temperature polyimide constructions, including dots, tapes, and custom-cut shapes — allowing you to match the material to your process temperature, chemistry, and production volume.

Note on polyimide masking materials: Kapton® is a registered trademark of DuPont. Where referenced, it is used only to indicate applications where Kapton® tape is commonly specified. SCH supplies high-performance polyimide masking materials and does not claim supply, affiliation, or endorsement by DuPont unless explicitly stated.

• Masking Dot Rolls — best for repeatable, higher-volume production where operators require continuous use and consistent placement across long production runs.
  Available in paper-based and polyimide options depending on temperature and process requirements.
• A4 Masking Dot Sheets — best for fast workstation handling, quick dot selection, and short lead times.
  Ideal for prototype builds, low-volume production, and high-mix manufacturing.
  Available in paper-based and polyimide options depending on temperature and process requirements.
• Masking Tapes — ideal for edges, larger keep-out zones, and linear masking where clean boundaries and lift resistance are essential.
  Paper and polyimide constructions are available depending on your process needs.

In addition to standard masking dot rolls, sheets, and tapes, SCH offers custom masking sheets and bespoke masking shapes where standard formats are not suitable.

These can be supplied in paper-based or polyimide constructions depending on temperature, coating chemistry, and handling requirements.

Custom masking is particularly effective for:

• Complex connectors
• Non-circular features
• Unusual component layouts
• Defined keep-out zones
• Repeatable high-precision masking

Shapes can be produced to match specific component geometries, footprints, or design constraints — supporting consistent placement, faster preparation, and repeatable results.

Custom masking sheets are manufactured to order and supplied in A4 format. All designs are reviewed prior to manufacture so feasibility, lead time, and supply are confirmed before production begins.

• Connectors and headers
• Test points and vias
• LEDs and optical features
• Defined PCB keep-out areas
• Component interfaces and mating surfaces

If you are unsure which masking format is most suitable for your process:
👉 start with dot sheets for flexibility,
👉 choose dot rolls for repeatability at scale, and
👉 use tapes for edge masking.
For non-standard requirements, custom masking can be produced to match your exact application needs.