CIS Conformal Coating & Encapsulation

Question 1

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

Accepted Answer

Epoxy Resin

Answer

ER designates Epoxy Resin per IPC-CC-830, the standard qualification specification for conformal coatings.

Question 2

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

Accepted Answer

Epoxy (ER)

Answer

Epoxy (ER) coatings are thermoset and chemically cross-linked after curing, making them extremely resistant to solvents and very difficult to remove for rework.

Question 3

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

Accepted Answer

Silicone (SR)

Answer

Silicone (SR) coatings retain flexibility and protective properties from approximately -65°C to +200°C, outperforming all other coating types at temperature extremes.

Question 4

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

Accepted Answer

Vacuum plasma deposition

Answer

Standard conformal coating application methods include brush, dip, spray, and selective coating; vacuum plasma deposition is not a recognized IPC application method for conformal coatings.

Question 5

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

Accepted Answer

Defect

Answer

Delamination of conformal coating exposes the assembly to environmental attack and represents a failure of the protective function, making it a defect per IPC-A-610.

(CIS) Certified IPC Specialist Practice Test

(CIS) Certified IPC Specialist Practice Test

CIS Conformal Coating & Encapsulation