IPC-A-610 TEST QUESTIONS WITH VERIFIED
SOLUTIONS NEW MODIFIED GRADED A+ BEST
QUALITY TESTED AND VERRIFIED 2026 LATEST
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board is first immersed, Then withdrawn from the conformal coating solution.
Immersion speed, withdrawn speed, Immersion time, and Viscosity determine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.
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.
Page | 1
,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.
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.
Page | 2
, - 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.
Causes: -coating is too thick
- thermal shock
- coating cured too quickly
(6) Most Common Coating Defects and causes:
Dewetting --CORRECT ANSWER--Coating will not evenly coat the surface to
which its applied.
Causes: - uneven coating application.
- improper mixture of two- part material.
- Residue on coating surface.
- Surface tension and surface energy.
(6) Most Common Coating Defects and causes:
Delamination --CORRECT ANSWER--When coating has lifted up and away
from the board. This hinders protection because the area below the coating is
left exposed. (Ex:Ripping off more coating after demasking and pulling off too
much coating around the area.
Page | 3
SOLUTIONS NEW MODIFIED GRADED A+ BEST
QUALITY TESTED AND VERRIFIED 2026 LATEST
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.
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.
Page | 1
,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.
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.
Page | 2
, - 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.
Causes: -coating is too thick
- thermal shock
- coating cured too quickly
(6) Most Common Coating Defects and causes:
Dewetting --CORRECT ANSWER--Coating will not evenly coat the surface to
which its applied.
Causes: - uneven coating application.
- improper mixture of two- part material.
- Residue on coating surface.
- Surface tension and surface energy.
(6) Most Common Coating Defects and causes:
Delamination --CORRECT ANSWER--When coating has lifted up and away
from the board. This hinders protection because the area below the coating is
left exposed. (Ex:Ripping off more coating after demasking and pulling off too
much coating around the area.
Page | 3
