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IPC-A-610 Test Study Guide with Complete Solutions
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IPC-A-610 Test Study Guide with Complete Solutions 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 be...

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IPC-A-610 Test Study Guide with
Complete Solutions

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


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, GRACEAMELIA 2024/2025 ACADEMIC YEAR ©2024. ALL RIGHTS
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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.

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