IPC 610 Test Questions with Correct Answers
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.
5 Coating application methods: Selective 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The circuit board is first immersed, Then withdrawn from the conformal coating solution.
Immersion speed, withdrawn speed, Immersion time, and Viscosity determine the resulting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 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.
5 Coating application methods: Selective 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
