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Ipc a 610 exam latest actual exam 120 questions and correct detailed answers (verified answers) with rationales| graded a+| brand-new!!!$27.99
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Ipc a 610 exam latest 2024-
2025 actual exam 120
questions and correct
detailed answers (verified
answers) with rationales|
graded a+| brand-new!!!
3 types of Conformal Coating: Acrylic Resin (AR)
✔✔✔✔✔✔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)
✔✔✔✔✔✔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)
✔✔✔✔✔✔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
✔✔✔✔✔✔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
✔✔✔✔✔✔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
✔✔✔✔✔✔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 ✔✔✔✔✔✔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
✔✔✔✔✔✔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.
1. Solvent Removal
2. Peeling
3. Microblasting: using a concentrated mix of soft abrasive and
compressed air to abrade the coating.
4. Grinding/Scaping ✔✔✔✔✔✔ANSWER➖What are the Conformal
Coating Removal Methods by IPC? (4)
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