IPC A 610 EXAM 2025 LATEST ACTUAL
EXAM 100 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH
RATIONALES |A+ GRADE
3 types of Conformal Coating: Acrylic Resin (AR) Correct
Answer 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)
Correct Answer 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) Correct Answer 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 Correct
Answer 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
Correct Answer 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 Correct
Answer 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 Correct Answer
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 Correct Answer
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.
What are the Conformal Coating Removal Methods by
IPC? (4) Correct Answer
1. Solvent Removal
2. Peeling
3. Microblasting: using a concentrated mix of soft abrasive
and compressed air to abrade the coating.
4. Grinding/Scaping
(6) Most Common Coating Defects and causes:
Capillary Flow Correct Answer occurs when coating
migrates from one area of a board to another, leaving
behind an inconsistent, uneven finish on the surface.
Causes: -application of too much coating
- coating with low viscosity or high surface tension.
- low surface energy of component being coated.
(6) Most Common Coating Defects and causes:
Cracking and Ripples Correct Answer Visual cracks and
creases on components.
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