CCT CCT Surface Preparation & Bonding Techniques 2

Question 1

What does 'open time' refer to in adhesive bonding?

Accepted Answer

The working time after mixing before the adhesive starts to gel

Answer

Open time is the usable window after adhesive is mixed or applied during which parts must be assembled before gelation prevents proper bonding.

Question 2

Which type of surface contamination is most detrimental to composite adhesive bonding?

Accepted Answer

Mold release agents and silicone oils

Answer

Mold release agents and silicone oils are extremely difficult to remove and severely reduce surface energy, causing bond failure even in trace amounts.

Question 3

Which test is used to verify surface cleanliness before bonding composites?

Accepted Answer

Water break test

Answer

The water break test checks surface cleanliness; clean surfaces cause water to sheet evenly, while contaminated surfaces cause water to bead up.

Question 4

What is co-bonding in composite fabrication?

Accepted Answer

Bonding a cured part to an uncured laminate during the cure cycle

Answer

Co-bonding joins a previously cured component to a fresh uncured laminate, curing the assembly together to form the structural joint.

Question 5

What moisture condition is acceptable on composite surfaces before adhesive bonding?

Accepted Answer

Surfaces must be completely dry — moisture causes bond failure

Answer

Moisture on composite surfaces prevents proper adhesive wetting and dramatically reduces bond strength, so surfaces must be thoroughly dried before bonding.

CCT - Certified Composite Technician Practice Test

CCT - Certified Composite Technician Practice Test

CCT CCT Surface Preparation & Bonding Techniques 2