Conformal coating for electronic assemblies
Justicia Marin is a B2B supplier of conformal coating (tropicalisation) for electronic boards and assemblies, for manufacturers and integrators. We start from your drawing, sample or specification: you define which areas must be coated and which must stay free, and we coordinate the supply with specialised manufacturers.
What it is and what sets it apart
Conformal coating: a thin layer, not a block of resin
Conformal coating consists of applying a thin protective film on the surface of an electronic board or assembly, covering only the areas defined for the project. In electronics, tropicalisation is the term commonly used in Spanish for applying a conformal coating. Unlike potting, which occupies or fills a volume, the coating follows the surface without appreciably increasing the size of the assembly. The protection achieved is not a fixed property: it depends on the material, the coverage defined and the expected environment.
- Surface protection without appreciable increase in volume
- Only the areas defined for the project are coated
- The interfaces that must stay free are agreed before production
- The approved criterion is documented so that it can be repeated
If the requirement is to fill a cavity or embed an area instead of coating the surface, it corresponds to potting and encapsulation. The process itself is detailed on the capability page for coating application.
Decision criteria
What conditions the conformal coating solution
There is no universal coating. What defines the solution is what has to be covered, what must stay free, with which material and what must be possible afterwards.
Coverage and free areas
Which areas must be coated and which must remain uncoated. Exclusion zones can be defined so that connectors, contacts or other interfaces stay free through masking.
Expected environment
What the equipment will be exposed to: humidity, condensation, industrial atmosphere or outdoor weather. The environment is not a promise of result; it is the data that makes it possible to define what protection the project needs.
Material and compatibility
The coating material must coexist with the components, the surface and the assembly process. If it is already specified in your documentation, that reference is coordinated; if not, it is defined with the manufacturer according to the requirements.
Rework and maintenance
If the assembly must allow later rework or maintenance, it is worth defining that beforehand: how easily the coating can be removed depends on the material and the coating process.
Starting data and criteria
What to define before applying conformal coating
The quote is prepared on the information available and sets out in writing the scope the selected manufacturer can take on.
- Drawing, sample or specification of the board or assembly
- Areas that must be coated
- Areas and interfaces that must stay free
- Material reference, if already defined
- Expected working environment of the equipment
- Coverage or thickness requirements, if specified
- Need for later rework or maintenance
- Initial quantity and expected later volume
Decision points
Documentation, sample and continuity before the supply is repeated
These three milestones turn an initial need into a configuration that can be ordered again without reinterpretation.
We define the areas
You state which areas must be protected and which stay free: connectors, test points, heat sinks or contact areas.
Coated sample
You validate the finish, the masking and the behaviour in your assembly or repair process.
Application to series
We fix the approved criterion in writing and coordinate deliveries keeping the same finish.
How we coordinate the supply
How we manage conformal coating
The critical detail is usually the masking: which areas must NOT be coated.
Starting documentation
Drawing, sample or photograph of the board, together with the areas to be coated and those that must stay free.
Process selection
We consult the network on which coating and which conditions fit your assembly and your volume, and what implications they have for the later assembly.
Sample and approval
When the project requires it a sample is prepared. You check the finish and the masking before committing to a quantity.
Recurring supply
The approved criterion is kept in writing and we coordinate deliveries keeping the same coverage and the same free areas.
Coordinated manufacturing
Conformal coating with specialised manufacturers
The right manufacturer depends on the coverage to be applied, the areas that must stay free, the material or requirement defined, the surface preparation conditions, the quantity and the agreed checks. We select and coordinate the one that fits that combination.
Do you need a supplier for conformal coating or tropicalisation?
Justicia Marin reviews the scope, selects the specialised manufacturer and coordinates the supply from your documentation and the requirements of the project. The coating is physically applied by the manufacturer; we centralise review, selection and delivery so that you work with a single point of contact.
What shapes conformal coating
Coverage — which areas of the board or assembly must be coated
Free areas — interfaces that must remain uncoated
Material — reference or requirements, when already defined
Preparation — surface conditions controlled by the manufacturer
Quantity and control — sample, repeat orders and agreed checks
From approved sample to recurring supply
When the project requires it, the manufacturer prepares a coated sample that you check before committing to a quantity. From then on we keep the approved coverage and free areas between orders, so that repeating the supply does not depend on reinterpreting the specification.
Justicia Marin does not apply the coating in facilities of its own: we review the scope, select the manufacturer and coordinate the supply. If the board is part of a larger assembly, it is handled as custom electromechanical assemblies.
Related information
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What this service actually covers
The coating is applied by a specialised manufacturer in the network; Justicia Marin coordinates and verifies. We do not attribute a specific protection rating or a standardised resistance to this process in a generic way: the real behaviour depends on the material, the thickness and the masking, and is defined for each project in the quote.
Questions before the quote
Conformal coating: frequently asked questions
- What exactly does conformal coating protect?
- Conformal coating protects the surface of a circuit board against moisture, condensation, dust and contamination that can lead to leakage currents or corrosion. The layer is thin and follows the shape of the components. It does not replace a housing or a seal: the final protection depends on the material, the layer thickness, the coverage and the environment in which the device works.
- When do you choose conformal coating and when potting?
- Conformal coating fits when a thin surface protection is enough and the board must remain light, compact and, where needed, repairable. Potting fits when an area has to be embedded mechanically or sealed more strongly. We discuss the environment, the load and the later maintenance with you before the process is chosen.
- Which areas must stay free of coating?
- Usually connectors, pin strips, test points, switch contacts, heat sinks and areas that will later be soldered or measured. These are masked before the coating is applied. State them clearly on the drawing or photograph: the masking is often the critical detail of the whole project.
- Are there standards for conformal coating?
- Yes, the industry uses, among others, IPC-HDBK-830 as a guide to selecting and applying coatings. Which criterion applies to your project, however, is fixed in the specification and confirmed with the manufacturer in the quote. We do not attribute performance or conformity to the process in general terms.
- Who applies the conformal coating?
- A specialised manufacturer that we choose based on the material, the coverage, the masking, the quantity and the agreed checks. Justicia Marin reviews the scope with you, coordinates sample and delivery and reviews the records. We do not have a coating line of our own.
- How is the coverage checked?
- Many coating materials contain a UV indicator, which makes the coverage visible under UV light; the free areas are checked in the same way. Sampled thickness measurements can also be agreed. The acceptance criterion is fixed before the order and the manufacturer checks it on the sample and on the batch.
- Can a coated board still be repaired later?
- That depends on the material: some coatings can be removed locally and reapplied, others hardly at all. If repair or maintenance matters, say so in the request. The choice of material and process then takes repair into account, and the criterion is recorded in writing.
Does your electronics work outside a clean environment?
Ask us about the right coating.
Tell us the type of board, the areas that must stay free and the expected working environment so that we can prepare a proposal.
What you can send us
- Bill of materials or part numbers (Excel, PDF or text)
- Drawing or schematic for custom assemblies (PDF, DXF or similar)
- Estimated quantity and expected repeat orders
- Your priority: competitive price, certification or lead time
- Required standards or documentation
- Target delivery date
Tell us what you need to buy
We reply within 1 working day.