Job work

Services

Two on-site job work programmes: protective conformal coating of assembled PCBs, and ESD conductive paint systems for the environment those boards are built in.

Conformal Coating Job Work

Application, UV optical inspection, curing, thickness testing, removal and final inspection, delivered on site by 30+ trained engineers.

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EMS Technologies engineer applying ELPEGUARD conformal coating to a PCB assembly during on-site job work

Product

Conformal Coating Job Work

Rather than supplying the coating and leaving you to run it, EMS puts trained engineers on your line and takes the whole process: operating the coating machine, application, UV optical inspection, touch-up, drying and curing, thickness testing, removal, reworking and final inspection. The team is 30+ trained B.Tech engineers, all trained under Lackwerke Peters, working at client locations across India.

  • Brush, spray, dip and automatic selective application methods
  • UV optical inspection of every board, with touch-up and re-check
  • Cure schedules run to the Peters datasheet for the coating used
  • Thickness measured and recorded, with rework where needed
  • 30+ trained engineers deployed on site at your own line
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ESD Paint Job Work

ProtectA Pro ESD conductive and anti-static paints applied to floors, walls, work surfaces and bins, with earthing and resistance testing.

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ProtectA Pro ESD conductive paint applied to polypropylene bins and work surfaces, EMS Technologies job work

Product

ESD Paint Job Work

On-site application of ProtectA Pro ESD conductive and anti-static paints across floors, walls, work surfaces, conveyor systems and polypropylene bins. Built on a conductive polymer matrix, the system gives a charge a controlled path to ground instead of letting it build until it discharges into a component. We prepare the substrate, lay earthing bonded to the facility ground, apply the topcoat and test the result.

  • Surface preparation, conductive primer and copper earthing
  • Floors, walls, benches, conveyors, bins and racking
  • Point-to-point and point-to-ground resistance testing on completion
  • Applied under your site’s own permit-to-work and safety procedures
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How we work

From enquiry to released lot

Coating is a process, not a purchase. Every EMS job work engagement runs the same six stages, so the parameters that produced an acceptable sample are the parameters that produce lot number four hundred.

  1. 01 — Enquiry & assembly review

    You send the board details: substrate, component mix, connectors and keep-out areas, expected volume and the environment the assembly has to survive. Our engineers review whether the requirement is best met by acrylic, polyurethane, silicone, thick-film or aqua ELPEGUARD chemistry.

    You receiveA recommended coating system and application method, in writing.

  2. 02 — Sample / pilot lot

    A small lot is coated first at your line and inspected end to end so masking, coverage, thickness and cure behaviour are proven on your actual assembly before a production commitment is made.

    You receiveA coated sample with its UV inspection and thickness record.

  3. 03 — Process sign-off

    The proven parameters are fixed: coating system, application method, masking scheme, thickness target and band, cure schedule and the inspection criteria the lot will be judged against.

    You receiveAn agreed process sheet used for every subsequent lot.

  4. 04 — Production job work

    Our engineers run the agreed process on site at your facility, with the same masking and inspection steps applied lot after lot.

    You receiveCoated assemblies, lot-traceable to the process sheet.

  5. 05 — Inspection & release

    Every lot is inspected under UV for coverage, checked for thickness, and confirmed clear on keep-out areas. Anything outside the band is touched up and re-inspected rather than passed on.

    You receiveAn inspection record accompanying the released lot.

  6. 06 — Rework & aftercare

    Boards needing a component change come back for selective coating removal, repair support and re-coating, so a coated assembly is not a one-way decision.

    You receiveRe-coated, re-inspected boards and a rework record.

Quality

What every lot is checked against

Conformal coating fails quietly: a thin patch or a coated contact does not show up on the line, it shows up in the field. These are the checks that stand between the two.

UV coverage inspection, 100% of boards

ELPEGUARD coatings carry a UV tracer, so every coated board is inspected under UV light rather than sampled. Thin patches, pinholes, bridging, runs and coating that has crept onto a keep-out area are all visible before the board moves on.

Coating thickness measurement

Dry film thickness is measured against the band agreed at process sign-off. IPC-CC-830B and IPC-A-610 both treat thickness as a measured property, not a visual one, and lots outside the band are reworked rather than released.

Keep-out and connector verification

Connectors, test points, gold fingers, sockets and heatsink interfaces are masked before coating and verified clear afterwards, because a coated contact is a field failure that inspection at the customer rarely catches in time.

Cure confirmation before handling

Boards are released for handling and packing only after the cure schedule for that chemistry has completed — tack-free is not the same as cured, and moving a board too early is a common source of surface defects.

Workmanship criteria: IPC-A-610

Coated assemblies are judged against IPC-A-610 conformal coating workmanship criteria at the acceptance class agreed for the product — Class 2 for most industrial and automotive electronics, Class 3 where the assembly is life- or safety-critical.

Material qualification: IPC-CC-830B

The ELPEGUARD systems we apply come from Lackwerke Peters with their own qualification data. IPC-CC-830B is the current qualification standard for conformal coating material, having superseded the withdrawn MIL-I-46058C QPL.

ESD-controlled handling throughout

Boards are handled, staged and packed under ESD control using EMS-manufactured anti-static bags, bins and trays, so the assembly is not put at risk between coating and despatch.

Not sure which acceptance class applies to your product? Our standards explainer walks through IPC-A-610 classes, IPC-CC-830B and what happened to MIL-I-46058C.

Frequently asked

Job work questions

How does a conformal coating job work engagement run?

An enquiry is reviewed against the board and the environment it has to survive, and a coating system and application method are recommended in writing. A sample or pilot lot is coated and inspected first so masking, coverage, thickness and cure are proven on your actual assembly, then the parameters are fixed on a process sheet and repeat lots run to it on site at your line. Timing is confirmed against your lot size, board and location at quotation.

What quality standards does EMS apply to conformal coating?

Coated assemblies are judged against IPC-A-610 conformal coating workmanship criteria at the acceptance class agreed for the product — usually Class 2 for industrial and automotive electronics, Class 3 for life- or safety-critical assemblies. The ELPEGUARD materials applied are qualified by Lackwerke Peters against IPC-CC-830B, the standard that superseded the withdrawn MIL-I-46058C QPL. Every board is inspected under UV light rather than sampled, and dry film thickness is measured against an agreed band.

Does EMS coat at our factory or at its own site?

Both. EMS deploys 30+ trained engineers to run the agreed coating process on site at customer facilities across India, and also accepts boards sent to its Hyderabad facility. Which route suits you depends on lot size, board handling constraints and how much of the line the coating step has to sit inside.

Can a conformal coated board be reworked?

Yes. EMS provides selective coating removal, repair support and re-coating as part of the same job work programme. Acrylic coatings are the easiest to rework, polyurethane and silicone need more deliberate removal, and the choice of chemistry at the design stage largely decides how straightforward field repair will be.

What does ESD paint job work cover?

On-site application of ProtectA Pro ESD conductive and anti-static paints to floors, walls, work surfaces and polypropylene bins, including surface preparation, earthing of the applied system and resistance testing after cure to confirm the finished surface reads in the intended dissipative range.

Send us the board, get the process back

Tell us the assembly, the environment it has to survive and the volume. Our engineers come back with a coating system, an application method and a window.

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