CCT CCT Surface Preparation & Bonding

Question 1

What is the primary purpose of abrading a composite surface before bonding?

Accepted Answer

To increase surface area and remove contaminants for better adhesion

Answer

To reduce the weight of the part

Answer

To check for subsurface delaminations

Answer

To apply a primer coat

Question 2

Which solvent is most commonly used for wiping composite surfaces prior to bonding?

Accepted Answer

Acetone or MEK (methyl ethyl ketone)

Answer

Hydraulic fluid

Answer

Motor oil

Answer

Water

Question 3

What does the term 'peel ply' refer to in composite surface preparation?

Accepted Answer

A sacrificial fabric layer left on a surface that, when removed, exposes a bondable surface

Answer

A protective film applied after painting

Answer

A type of fiberglass cloth used for structural reinforcement

Answer

A rubber seal around the vacuum bag

Question 4

What is the maximum allowable time between surface preparation and adhesive application according to most aerospace bonding specifications?

Accepted Answer

4 to 8 hours

Answer

48 hours

Answer

72 hours

Answer

1 minute

Question 5

Why is a water-break test performed on a composite surface before bonding?

Accepted Answer

To verify the surface is clean and free of oil contamination

Answer

To measure the thickness of the substrate

Answer

To determine the cure state of the resin

Answer

To check for porosity

Question 6

Which primer is commonly applied to aluminum substrates before structural adhesive bonding in composite assemblies?

Accepted Answer

Corrosion-inhibiting epoxy primer (e.g., BR-127)

Answer

Zinc chromate wash primer only

Answer

Polyurethane topcoat

Answer

Silicone sealant