CCT CCT Surface Preparation & Bonding Techniques

Question 1

What is the primary purpose of surface preparation before bonding composite parts?

Accepted Answer

To improve adhesion by removing contaminants and creating surface energy

Answer

Surface preparation removes contaminants and increases surface energy to maximize adhesive bond strength.

Question 2

Which solvent is commonly used to clean composite surfaces before bonding?

Accepted Answer

Methyl ethyl ketone (MEK) or acetone

Answer

MEK and acetone effectively remove oils, mold release agents, and other contaminants from composite surfaces before bonding.

Question 3

What does peel ply leave behind when removed from a cured composite surface?

Accepted Answer

A textured, chemically active surface ready for bonding

Answer

Peel ply creates a textured, resin-rich surface that is chemically active and ready for secondary bonding without additional abrasion.

Question 4

What is the purpose of abrasion sanding during composite bonding surface preparation?

Accepted Answer

To create mechanical interlocking sites and increase surface area

Answer

Abrasion sanding creates microscopic mechanical interlocking sites and increases surface area, improving mechanical adhesion of the bond.

Question 5

How must aerospace film adhesives typically be stored to maintain their properties?

Accepted Answer

In a freezer to prevent premature cure

Answer

Aerospace film adhesives are stored in a freezer to halt the cure reaction and preserve their tack and mechanical properties until use.

CCT - Certified Composite Technician Practice Test