Conformal Coating

Conformal Coating

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Conformal Coating

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Conformal coating is a specialty polymeric film forming product that protects circuit boards, components, and other electronic devices from adverse environmental conditions. These coatings conform’ to the irregular landscape of the PCB providing increased dielectric resistance, operational integrity, and protection from corrosive atmospheres, humidity, heat, fungus, and airborne contamination such as dirt and dust.

Techspray offers a variety of conformal coating formulas to match field and engineering requirements and is IPC CC 830B and UL94-0 Qualified or rated. Specifications generally depend on the type of protection needed: e.g. thermal, moisture, and static resistance.

Coatings contain Opti/Scan (except LED Coating) to allow quality control inspection of coverage and evenness of the coating on a PCB. A coated board can be passed under a standard, low-cost UV (short-wave black) light, and the coated areas glow. The brighter the glow, the thicker the coating.

Application methods:

  • Dip – High volume method to fully coat boards. Thickness of the final coating is controlled by viscosity and withdrawal speed from the pot.
  • Conformal Coating Spray – Computer controlled selective spray systems, eliminate the need for masking. Higher viscosity than full coverage sprayer is generally needed (70-200 cps) to create precise edge definition and prevent splattering.
  • Manual Application – Aerosol and brushing are generally used for small production runs, rework and repair. If using for rework, the aerosol needs to be compatible with the original coating.

Conformal Coating Selection Guide

Fine-L-Kote SRV Silicone Conformal Coating
Silicone conformal coating that is high gloss, ultra-clear, moisture and abrasion resistant
Turbo-Coat Acrylic Conformal Coating Turbo-Coat Acrylic Conformed Coat
Acrylic Conformal Coating with the fastest cure, dry to touch in 3 minutes!
Fine-L-Kote AR Acrylic Conformal Coating Fine-L-Kote AR Acrylic Conforming Coats
Acrylic conformal coating for high dielectric strength & good moisture and abrasion resistance
Fine-L-Kote SR Silicone Conformal Coating SR Silicone Conformal Coating
Silicone Conformal Coating that's ideal for moisture, thermal and vibration protection
Fine-L-Kote LED2 Silicone Coating Fine-L-Kote LED Silicone Conformal Coating
Silicone conformal coating designed to coat over LEDs
Fine-L-Kote HT High-Temp Silicone Conformal Coating HT High-Temp Silicone Conformal Coating
Silicone coating engineered for superior thermal and moisture resistance
Fine-L-Kote UR Urethane Conformal Coating UR Urethane Conformal Coating
Tough coating with good chemical resistance
Turbo-Coat Thinner Turbo-Coat Thinner
Conformal coating thinner for Turbo-Coat
Conformal Coating Remover Conformal Coating Remover
Coating stripper for acrylic, silicone and urethane
Fine-L-Kote Conformal Coating Remover XT Conformal Coating Remover XT
Coating stripper for acrylic, silicone, urethane, and component epoxy coatings

FAQ's

How can you reduce chemical exposure?

Every organization using hazardous chemicals within their facility has the responsibility to equip their facility and personnel to maintain exposure levels below the TLV. Personal monitoring badges can be used to measure exposure of a specific material. Then, depending on the threshold limit and the application, exposure can be controlled with PPE like masks, face shields, respirators, and even coveralls. If they don’t reduce exposure below the recommended limit, you will need to consider a special ventilation hood or even containment booth. As you can see, as the exposure limit gets down to a certain level, the equipment required to safely use the solvent can get impractical. At that point, your best option is to consider a safer alternative.

What is the difference between dielectric strength and dielectric withstand voltage?

The dielectric strength is material intrinsic property and withstand voltage is surface property which depend on thickness of the material. They can be slightly different for thicker materials, but for conformal coating, the two numbers should be very close or the same. That is because we test coating at 3-5 mils thickness, calculate, then report the value per mil.

What type of UV light / black light should I use for QC inspection of the final conformal coating?

Conformal coating with UV tracer can be inspected with any typical UV lamp which has wavelength of 320-380 nm.

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