CIS Conformal Coating & Encapsulation

Question 1

In IPC conformal coating designations, what does 'ER' stand for?

Accepted Answer

Epoxy Resin

Answer

Ethylene Resin

Answer

Ester Resin

Answer

Elastomeric Rubber

Question 2

Which conformal coating type is most difficult to rework once fully cured?

Accepted Answer

Epoxy (ER)

Answer

Acrylic (AR)

Answer

Silicone (SR)

Answer

Urethane (UR)

Question 3

Which conformal coating type offers the widest operating temperature range and best high-temperature performance?

Accepted Answer

Silicone (SR)

Answer

Acrylic (AR)

Answer

Urethane (UR)

Answer

Epoxy (ER)

Question 4

Which of the following is NOT a standard method for applying conformal coating to electronic assemblies?

Accepted Answer

Vacuum plasma deposition

Answer

Brush application

Answer

Selective robotic coating

Answer

Dip coating

Question 5

Per IPC-A-610, conformal coating that exhibits delamination from the board surface is classified as which condition?

Accepted Answer

Defect

Answer

Target condition

Answer

Acceptable condition

Answer

Process indicator

Question 6

What primary function does conformal coating serve on a completed electronic assembly?

Accepted Answer

Protect against moisture, chemical attack, and environmental contaminants

Answer

Improve electrical conductivity between components

Answer

Increase the mechanical strength of individual solder joints

Answer

Reduce the overall weight of the board assembly

Question 7

Why do most commercial conformal coatings contain fluorescent UV additives?

Accepted Answer

To allow visual verification of coating coverage using a UV black light

Answer

To accelerate the curing process under UV lamps

Answer

To improve the coating's moisture resistance properties

Answer

To meet RoHS compliance requirements