3 types of Conformal Coating: Acrylic Resin (AR)
→ This type of coating provides FAIR elasticity and general protection. It has high
dielectric strength, and fair moisture and abrasion resistance. This coating is different
from others because its facility for removal. This type are EASILY an...
IPC-A-610 TEST QUESTIONS AND
ANSWERS 2024/2025
3 types of Conformal Coating: Acrylic Resin (AR)
→ This type of coating provides FAIR elasticity and general protection. It has high
dielectric strength, and fair moisture and abrasion resistance. This coating is different
from others because its facility for removal. This type are EASILY and quickly removed
by a variety of solvents, often without requiring agitation. This makes rework and field
repair very practical and economical. This type doesn't protect against solvents and
solvent vapors.
3 types of Conformal Coating: Silicone Resin (SR)
→ This type of coating provides EXCELLENT protection in a very wide temperature range.
This coating provides good chemical resistance, moisture, and salt spray resistance,
and is very flexible. This type is NOT abrasion resistant because of its rubbery nature,
but this property does make it resilient against vibrational stresses. Commonly used in
high-humidity environments. Removal can be CHALLENGING. requiring specialized
solvents, long soak time, and agitation from a brush.
3 types of Conformal Coating: Urethane (Polyurethane) Resin (UR)
→ This type of coating is known for its EXCELLENT moisture and chemical resistance. It is
also very abrasion resistant. Combining those factors with its SOLVENT RESISTANCE
results in a conformal coating that is very difficult to remove. Like SR, full removal
generally requires special solvents, long soak time, and agitation with a brush. This is
common in aerospace application. ex: Conathane
5 Coating application methods: Manual Spraying
→ Aerosol can or handheld spray gun. Time consuming method of coating for a small
quantity of boards. Lots of masking beforehand. Quality and consistency of outcome
are operator- dependent.
5 Coating application methods: Automated spraying
→ Programmed spray system that moves the board on a CONVEYOR under an
alternative spray head that applies a conformal coating.
→ An automated conformal coating process that uses PROGRAMMABLE ROBOTIC SPRAY
NOZZLES to apply the coating to very specific areas on the circuit board. May
eliminate the need for masking using the program. The UV lamp in machine helps cure
the coating right after it is sprayed.
5 Coating application methods: Dipping
→ The circuit board is first immersed, Then withdrawn from the conformal coating solution.
Immersion speed, withdrawn speed, Immersion time, and Viscosity determine the
resulting film formation. Common for high volume processing. Masking may increase.
This method is good to coat both Front and Back of the board.
5 Coating application methods: Brushing
→ Simple application method used mainly in repair and rework. Conformal Coating is
applied with a BRUSH to specific areas on the board. Low-cost method but requires
lots of manual labor and is highly variable depending on operator proficiency and
consistency. This is the best for a small batch or a single board.
1. Solvent Removal
2. Peeling
3. Microblasting: using a concentrated mix of soft abrasive and compressed air to abrade the
coating.
4. Grinding/Scaping
→ What are the Conformal Coating Removal Methods by IPC? (4)
(6) Most Common Coating Defects and causes:
Capillary Flow
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