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IPC A 610 EXAM LATEST 2026-2027 ACTUAL EXAM 100 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES|AGRADE
- IPC A 610 EXAM LATEST 2026-2027 ACTUAL EXAM 100
- QUESTIONS AND CORRECT DETAILED ANSWERS WITH
- RATIONALES|AGRADE
- What is the purpose of Conformal Coating? - ANSWER- Conformal
- coatings can be used in a wide range of environments to protect printed
- circuit boards from moisture, salt spray, chemicals and temperature
- extremes in order to prevent such things as corrosion, mold growth, and
- electrical failures.
- Measuring wet coating (2)
- Wet Film Comb - ANSWER- Most common method to measure wet
- coating. The gauge consists of a series of combs with different distance
- between the marked points and the baseline. After placing the comb into
- the wet coating film, the thickness can be measured in Microns or Mils.
- Measurement determined by the number between the last tooth coated
- and the following tooth which is free of coating.
- Measuring wet coating (2)
- Wet Film Wheel - ANSWER- Method to measure wet coating using two
- outer wheels fixed to a central spindle wheel. Thickness is measured by
- rolling the wheel on the maximum scale towards accurately ground zero.
- When rolling the wheel on the coated board, the central wheel will touch
- the coating. The first point of contact on the central wheel determines
- the wet film thickness.
- Measling - ANSWER- Internal condition occurring in laminated base
- material in which the glass fibers are separated from the resin at the
- weave intersection. This condition manifests itself in the form of discrete
- white spots or crosses below the surface of the base material, and is
- usually related to THERMALLY INDUCED STRESS.
- Crazing - ANSWER- Internal condition occurring in the laminated base
- material in which the glass fibers are separated from the resin at the
- weave intersections. This condition manifests itself in the form of
- CONNECTED white spots or crosses below the surface of the base
- material and usually related to MECHANICALLY INDUCED STRESS.
- Blistering - ANSWER- Delamination in the form of a localized swelling
- and separation between any of the layers of a lamination base material,
- or between base material and conductive foil or protective coating.
- Delamination - ANSWER- Separation between plies within base
- material, between a base material and a conductive foil or any other
- planar separation within a printed board.
- Weave Texture - ANSWER- Surface condition of a base material in
- which a weave pattern of glass cloth is apparent although the unbroken
- fibers are completely covered with resin.
- Weave Exposure - ANSWER- Surface condition of a base material in
- which the unbroken fibers of woven glass cloth are NOT completely
- covered by resin.
- Haloing - ANSWER- condition existing in the base material in the form
- of a light area around holes or other machined areas on or below the
- surface of the base material. Mechanically induced fracturing or
- delamination on or below the surface of the base material; a Light area
- around the holes, other machined areas or both.
- (a light ring around a hole on a circuit board)
- FOD (Foreign Object Debris) - ANSWER- A generic term for a
- substance, debris, particulate matter or article alien to the assembly or
- system.
- ex: wire and lead clippings, hair, dust, non-ESD safe objects.
- Solder Mask Coating - ANSWER- Heat-resisting coating material
- applied to selected areas to prevent the deposition of solder upon those
- areas during subsequent soldering. Solder Mask material may be applied
- as a liquid or a dry film. (ex: pink masking)
- Conformal Coating - ANSWER- Provides a barrier layer to the surface
- of an electronic assembly to provide protection against the end use
- environment.
- -distribution depends partly on the method of application and may affect
- visual appearance and corner coverage.
- Dipping - ANSWER- May have a drip line or localized build-up on the
- edge of the board. This build-up may contain small amount of bubbles
- but it will not affect the functionality or reliability of the coating.
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