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Conformal Coating

A thin polymeric film that conforms to the contours of a printed circuit board to protect the components of the board is a conformal coating material. Usually applied at a thickness of 25-250 μm[1](micrometers), Conformal coating is applied to electronic circuits to protect against extreme humidity, dust, chemicals, and temperature.It is possible to apply coatings in a variety of ways, including cleaning, spraying, dispensing,

Application

If insulating surfaces become contaminated with ionic substances such as fingerprint residues, which can become weakly conductive in the presence of moisture, precision analog circuitry can experience degraded precision. (Sudden drops in performance at high humidity, for example when a technician breathes on it, are the classical indication of micro-contamination on an analog circuit board). A suitably chosen conformal coating can reduce the effects of mechanical stress and vibrations on the circuit and its ability to perform in extreme temperatures.

For example, a silicon die is mounted on the board with an adhesive or a soldering process in a chip-on-board assembly process, then electrically linked by wire bonding, usually with gold or aluminum wire of.001 inch diameter. The chip and wire are fragile, so they are encapsulated in a conformal coating version called "glob top." This protects the wires or the chip from being harmed by unintentional touch. Increasing the voltage rating of a dense circuit assembly is another application of conformal coating[5]. Particularly at high altitudes, an insulating coating can withstand a far stronger electrical field than air.

Acrylic
Ease of rework
Simple drying process
Good moisture resistance
High fluorescence level
Ease of viscosity adjustment

Polyurethane
Good dielectric properties
Good moisture resistance
Solvent resistance
Less reversion potential
Abrasion resistance

Silicones
Stable over wide temperature range (in general, -40C to 200C)[-40F to 392F]
Flexible, provides dampening and impact protection
Good moisture resistance
High dielectric strength
Low surface energy for better wetting

Bectron AC 111N (Acrylic)

Properties

Property	Conditions	Unit	Value
Color & Appearance [*]	Visual	—	Clear, light yellow liquid
Viscosity by Brookfield [*]	at 25°C	mPa.s	5 – 50
Density [*]	at 25°C	g/ml	0.85 – 0.95
Solid content [][*]	1 gm – 120°C/1 hr	%	14 – 16, 21 – 23, 32 – 34
Storage stability [*]	stored in original sealed container at 25°C	Months	12
[] These properties form our sales specification [*] Available in three solid contents based on application requirement

Drying conditions (Typical):

Property	Conditions	Unit	Value
Dry film thickness	-	Micron	20
Touch dry time	at 25°C	Minute	15
Full dry time	at 25°C	Hours	24

Recommended Curing Cycle:

25°C 24 hours or50°C 1 hours The curing schedules suggested are for general guidance. It has been suggested based on specified temperature, thickness & other controlled conditions. However, this time should be decided in each case depending upon application conditions.

Cured film properties (Typical):

Property	Conditions	Unit	Value
Cross cut test	at 25°C	-	Pass
Volume resistivity	at 25°C	Ω.cm	10¹⁵
Salt Sprat test	at 35°C – 48 hrs	-	Pass

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