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

Total time to fully cure the adhesive

Answer

Time to open the adhesive container

Answer

Shelf life of the unmixed adhesive

Question 2

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

Accepted Answer

Mold release agents and silicone oils

Answer

Airborne dust

Answer

Water condensation

Answer

Metallic particles

Question 3

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

Accepted Answer

Water break test

Answer

Tensile test

Answer

Hardness test

Answer

Bend test

Question 4

What is co-bonding in composite fabrication?

Accepted Answer

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

Answer

Bonding two fully cured laminates together with adhesive

Answer

Curing two uncured laminates together without adhesive

Answer

Post-cure bonding with mechanical fasteners only

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

Up to 5% moisture by weight

Answer

Any amount is acceptable with epoxy adhesives

Answer

Up to 10% moisture by weight

Question 6

Which grit sandpaper is typically recommended for composite surface preparation before secondary bonding?

Accepted Answer

180 to 220-grit

Answer

36-grit

Answer

600-grit

Answer

1500-grit