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Desirable Material Properties When selecting a coating, the entire suite of material properties must be considered in order to choose the best coating for the application. Unfortunately there is no one size fits all solution, but many different coatings, each suited to different applications, as shown in Table 41.1. The following are some of the properties to consider:

Ease of application and producability The intended production environment may determine the cure process and application process that is best for the job, and will narrow the field of alternatives Compatibility The coating must not be inhibited from curing by any material on the completed assembly Often the best way to address this is to ask the manufacturer and try out the coating in question on a sample of the materials that you are going to use Moisture resistance Dielectric constant For RF and high-speed circuits, a material with a low dielectric constant will change circuit performance less than a material with a higher one Dielectric strength For high-voltage application, materials with a high dielectric strength should be used For a valid comparison, tests must be performed on samples of equivalent thickness, since thin samples will break down at a higher volt/mil than thick samples of the same material.

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eliminate the effect of dispersion but not of axial flow On the other hand, axial feed slots eliminate the effect of non-axial flow but not of dispersion Circumferential feed slots are usually preferred in

Insulation resistance Also known as resistivity, insulation resistance is of concern in highvoltage or high-impedance circuits, where the resistance in the circuit is very high (>10M ohm) and is significant compared to the resistance of the coating and PWB laminate For these applications, choose a coating with high (>10^15 ohm-cm) resistivity and excellent moisture resistance Hardness For products that need to withstand cold temperatures < 10 C, a soft coating is recommended so that at cold temperatures the coating will not exert excessive force on fragile components (see Fig 417) For products that need good abrasion resistance and protection from external handling damage, a harder coating must be used Glass transition temperature (Tg) For assemblies that need to withstand cold environments, select a coating that either has a Tg below the coldest temperature required or a Tg of 25 C and above.

Coatings that have a low Tg in the range of operation will suddenly get hard at cold temperatures and impose great stress on the surrounding components..

2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4

Elongation Materials with high elongation are resistant to cracking and abrasion. Reworkability AR coatings are the easiest to rework, whereas XY and ER are the hardest. Abrasion resistance This is ability of the coating to withstand damage from handling and later assembly operations, as well as in the field.

Areas to Mask During the design, the designer needs to consider all the areas and parts on the board that need to be uncoated and identify them on the assembly drawing, shop instructions, or other paperwork that the coating technician will use. Although it is obvious to the design engineer that an expensive infrared (IR) sensor element should not be coated, it may not be so obvious to the technician holding a drawing that says, Coat entire board, and nothing else. Being specific on the drawing clarifies what should be coated and how. Consider the following areas:

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Coating on connector pins can cause open circuits, and may interfere with the full mating of the connector. It is necessary to mask the back of the open back connectors as well as the front, to keep the coating from flowing along the back of the pin into the active area. Also, pin alignment depends on a certain amount of looseness on the pins, and filling the connector shell with coating will defeat this feature. Coating should be kept from the edges of plug-in CCAs where the card guides travel. The coating will interfere with proper operation of the card guide and may prevent proper grounding of the card. Mounting holes for screws should be masked to keep the coating from filling or reducing the size of the hole and to ensure that the PWB is properly grounded. Test points should be masked so that they can be reliably accessed during testing. The adjustment screws of adjustable components. If the adjustable components have openings in them, the openings should be masked also.

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