IPC-A-610 TEST QUESTIONS WITH CORRECT
VERIFIED ANSWERS 2025 – 2026 UPDATE.
3.types.of.Conformal.Coating:.Acrylic.Resin.(AR)..ANS.-
.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..Thi
s.type.are.EASILY.and.quickly.removed.by.a.variety.of.solvents,.often.without.requiring.agitation..This.mak
es.rework.and.field.repair.very.practical.and.economical..This.type.doesn't.protect.against.solvents.and.sol
vent.vapors.
3.types.of.Conformal.Coating:.Silicone.Resin.(SR)..ANS.-
.This.type.of.coating.provides.EXCELLENT.protection.in.a.very.wide.temperature.range..This.coating.provid
es.good.chemical.resistance,.moisture,.and.salt.spray.resistance,.and.is.very.flexible..This.type.is.NOT.abra
sion.resistant.because.of.its.rubbery.nature,.but.this.property.does.make.it.resilient.against.vibrational.str
esses..Commonly.used.in.high-
humidity.environments..Removal.can.be.CHALLENGING..requiring.specialized.solvents,.long.soak.time,.an
d.agitation.from.a.brush.
3.types.of.Conformal.Coating:.Urethane.(Polyurethane).Resin.(UR)..ANS.-
.This.type.of.coating.is.known.for.its.EXCELLENT.moisture.and.chemical.resistance..It.is.also.very.abrasion.r
esistant..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..ANS.-
.Aerosol.can.or.handheld.spray.gun..Time.consuming.method.of.coating.for.a.small.quantity.of.boards..Lot
s.of.masking.beforehand..Quality.and.consistency.of.outcome.are.operator-.dependent.
5.Coating.application.methods:.Automated.spraying..ANS.-
.Programmed.spray.system.that.moves.the.board.on.a.CONVEYOR.under.an.alternative.spray.head.that.ap
plies.a.conformal.coating.
5.Coating.application.methods:.Selective.coating..ANS.-
.An.automated.conformal.coating.process.that.uses.PROGRAMMABLE.ROBOTIC.SPRAY.NOZZLES.to.apply.t
he.coating.to.very.specific.areas.on.the.circuit.board..May.eliminate.the.need.for.masking.using.the.progra
m..The.UV.lamp.in.machine.helps.cure.the.coating.right.after.it.is.sprayed.
, 5.Coating.application.methods:.Dipping..ANS.-
.The.circuit.board.is.first.immersed,.Then.withdrawn.from.the.conformal.coating.solution..Immersion.spee
d,.withdrawn.speed,.Immersion.time,.and.Viscosity.determine.the.resulting.film.formation..Common.for.h
igh.volume.processing..Masking.may.increase..This.method.is.good.to.coat.both.Front.and.Back.of.the.boa
rd.
5.Coating.application.methods:.Brushing..ANS.-
.Simple.application.method.used.mainly.in.repair.and.rework..Conformal.Coating.is.applied.with.a.BRUSH.t
o.specific.areas.on.the.board..Low-
cost.method.but.requires.lots.of.manual.labor.and.is.highly.variable.depending.on.operator.proficiency.an
d.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..ANS.-.What.are.the.Conformal.Coating.Removal.Methods.by.IPC?.(4)
(6).Most.Common.Coating.Defects.and.causes:.
.Capillary.Flow..ANS.-
.occurs.when.coating.migrates.from.one.area.of.a.board.to.another,.leaving.behind.an.inconsistent,.uneve
n.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..ANS.-.Visual.cracks.and.creases.on.components..
Causes:.-coating.is.too.thick
.-.thermal.shock
.-.coating.cured.too.quickly
(6).Most.Common.Coating.Defects.and.causes:
VERIFIED ANSWERS 2025 – 2026 UPDATE.
3.types.of.Conformal.Coating:.Acrylic.Resin.(AR)..ANS.-
.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..Thi
s.type.are.EASILY.and.quickly.removed.by.a.variety.of.solvents,.often.without.requiring.agitation..This.mak
es.rework.and.field.repair.very.practical.and.economical..This.type.doesn't.protect.against.solvents.and.sol
vent.vapors.
3.types.of.Conformal.Coating:.Silicone.Resin.(SR)..ANS.-
.This.type.of.coating.provides.EXCELLENT.protection.in.a.very.wide.temperature.range..This.coating.provid
es.good.chemical.resistance,.moisture,.and.salt.spray.resistance,.and.is.very.flexible..This.type.is.NOT.abra
sion.resistant.because.of.its.rubbery.nature,.but.this.property.does.make.it.resilient.against.vibrational.str
esses..Commonly.used.in.high-
humidity.environments..Removal.can.be.CHALLENGING..requiring.specialized.solvents,.long.soak.time,.an
d.agitation.from.a.brush.
3.types.of.Conformal.Coating:.Urethane.(Polyurethane).Resin.(UR)..ANS.-
.This.type.of.coating.is.known.for.its.EXCELLENT.moisture.and.chemical.resistance..It.is.also.very.abrasion.r
esistant..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..ANS.-
.Aerosol.can.or.handheld.spray.gun..Time.consuming.method.of.coating.for.a.small.quantity.of.boards..Lot
s.of.masking.beforehand..Quality.and.consistency.of.outcome.are.operator-.dependent.
5.Coating.application.methods:.Automated.spraying..ANS.-
.Programmed.spray.system.that.moves.the.board.on.a.CONVEYOR.under.an.alternative.spray.head.that.ap
plies.a.conformal.coating.
5.Coating.application.methods:.Selective.coating..ANS.-
.An.automated.conformal.coating.process.that.uses.PROGRAMMABLE.ROBOTIC.SPRAY.NOZZLES.to.apply.t
he.coating.to.very.specific.areas.on.the.circuit.board..May.eliminate.the.need.for.masking.using.the.progra
m..The.UV.lamp.in.machine.helps.cure.the.coating.right.after.it.is.sprayed.
, 5.Coating.application.methods:.Dipping..ANS.-
.The.circuit.board.is.first.immersed,.Then.withdrawn.from.the.conformal.coating.solution..Immersion.spee
d,.withdrawn.speed,.Immersion.time,.and.Viscosity.determine.the.resulting.film.formation..Common.for.h
igh.volume.processing..Masking.may.increase..This.method.is.good.to.coat.both.Front.and.Back.of.the.boa
rd.
5.Coating.application.methods:.Brushing..ANS.-
.Simple.application.method.used.mainly.in.repair.and.rework..Conformal.Coating.is.applied.with.a.BRUSH.t
o.specific.areas.on.the.board..Low-
cost.method.but.requires.lots.of.manual.labor.and.is.highly.variable.depending.on.operator.proficiency.an
d.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..ANS.-.What.are.the.Conformal.Coating.Removal.Methods.by.IPC?.(4)
(6).Most.Common.Coating.Defects.and.causes:.
.Capillary.Flow..ANS.-
.occurs.when.coating.migrates.from.one.area.of.a.board.to.another,.leaving.behind.an.inconsistent,.uneve
n.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..ANS.-.Visual.cracks.and.creases.on.components..
Causes:.-coating.is.too.thick
.-.thermal.shock
.-.coating.cured.too.quickly
(6).Most.Common.Coating.Defects.and.causes:
