Products Overview

Processor Modules

I/O Expansion Modules


Enclosures & Accessories


Custom Products

COM-based SBCs

2-in-1 SBCs

Custom Solutions


Lifecycle Extension



Industrial Automation




Support Overview

Technical Resources

Contact Technical Support

Request an RMA

About Diamond Systems

The Diamond Advantage

Markets & Applications


Career Opportunities

3.5" Form Factor
COM Express
ARM SBCs and Baseboards
Single Board Computers
I/O Modules
Power Supplies
Single Board Computers
I/O Modules
Power Supplies
I/O Modules
Single Board Computers
PCIe MiniCard
PCIe MiniCard
PCIe MiniCard
PCIe MiniCard
PCIe MiniCard
I/O Modules
Single Board Computers
I/O Modules
Small form factor
Ethernet Switch Modules
Single Board Computers
Ethernet Switches
Nano and NX Solutions
AGX Xavier Module Solutions
TX2 / TX2i Module Solutions
you are not logged in:
login | signup
lost password?

Designing Embedded Computers for Rugged Applications

Application Articles

Building Automation
Paper Processing
Train Controller
Wind Instrument
Lung Simulator
Gas Analyzer
Weapon System

Visit our Markets & Applications page.

Sign Up for our eNewsletter Today!

Conformal Coating


Conformal coating is a means of protecting an electronic circuit board from damage due to moisture or fungus. It is popular for products which will be used in outdoors environments or vehicles. The coating consists of a non-conductive compound that covers all surfaces except those required for electrical or thermal connections. It is clearly visible as a clear, shiny, paint-like material. Some coatings are hard, while others have a slightly rubbery texture. Most coatings include a marker that appears bright greenish-blue under a blacklight (UV). This marker enables easy inspection of the coating thoroughness. The conformal coating process is as follows:

  1. Board is cleaned and lightly etched to enable the coating to adhere reliably.
  2. Protected areas are masked off or disassembled (see below).
  3. Coating is applied using a spray process. Both sides, as well as the edges, are coated.
  4. Coating is cured using slightly elevated temperatures according to the coating type.
  5. Masking is removed and any removed parts are reassembled. Jumpers are reinstalled on jumper blocks.
  6. Board undergoes full production test to ensure reliable operation.

Eligible Products

Conformal coating is available for all board-level products manufactured by Diamond Systems, including CPU boards and I/O boards. It is also available for our flashdisk memory modules. Coating is not available for cables, hardware, accessories. For conformal coating on resale products, please contact us.

Coating Types

Diamond Systems offers 3 standard types of conformal coating. All coating is done by an outside service provider who specializes in conformal coating and provides services according to industry-standard practices.

  1. Acrylic Resin (AR): Humiseal 1B31 or 1B73. Acrylic is the most popular type, as it is the easiest to apply and easiest to rework afterwards should board repair become necessary. [datasheet 1] [datasheet 2]
  2. Urethane (UR): Hysol PC18M. [datasheet]
  3. Silicone (SI): Dow Corning 1-2620. Easy to rework; offers excellent adhesion to boards. [datasheet]

Masked / Uncoated Components

The following components are masked off before coating:

  • Contact surfaces of all I/O connectors
  • Contact surfaces of all bus connectors
  • Configuration jumper blocks
  • Component surfaces that contact heat sinks (heat sinks are removed prior to coating)
  • Board mounting holes

All these components will be fully functional after coating. The customer may specify additional areas to be protected from the coating if desired. Normally the serial number label and any other board labels are coated as well.

Price and Leadtime

The price for conformal coating is the same for all coating types but varies according to the type of board: COM-based SBCs, PC/104, EBX, or memory module. The cost includes a minimum lot charge. Once the minimum is met, the price per board is based on the type of board: PC/104, EBX, or Flashdisk. Conformal coating generally requires 8-10 business days. This additional time will be built into the delivery date quoted for your order.

Warranty and Repair

The Diamond Systems 2 year warranty still applies to most boards after conformal coating is applied. Consult with our Sales department for final determination.

The warranty will not apply if the customer attempts rework on the board, because reworking a coated board is more difficult and may result in to damage the component pads and traces if not done carefully. Components can still be removed and replaced if necessary by Diamond Systems’ repair department.

For more information, please contact your sales representative or Diamond Systems at:

(1) 650-810-2500 or email us at