Specification section3.4

What do you need to learn?

The advantages and disadvantages of each

adhesive

What materials each adhesive is suitable for

Adhesives 3.4

PVA

(Polyvinyl acetate)

• Polyvinyl Acetate is a white water-based adhesive.

• The PVA soaks into the surface and sets once the water is absorbed into the material.

• Once set, it is often regarded as being stronger than the material it is gluing, making a very strong bond.

Adhesives 3.4

Contact adhesive

• Both surfaces are coated with this glue which is then allowed to become touch dry.

• Adhesion takes place as soon as the two surfaces are placed together. There is no opportunity to reposition the pieces.

• Gives off solvent fumes which are dangerous so good ventilation is essential.

Adhesives 3.4

Epoxy resin

• A very versatile but expensive adhesive which will stick most materials.

• Equal amounts of resin and hardener are mixed together into a paste which then sets chemically.

• Quick setting epoxy resins can dry as quickly as 15 minutes.

• Araldite is an example of Epoxy Resin.

Adhesives 3.4

Tensol cement

• There are several types available.

• The most common is Dichloromethane, which works by dissolving the surfaces of hard plastics such as acrylic and polystyrene.

• Sets very quickly.

• Very dangerous fumes given off so ventilation is essential.

Adhesives 3.4

Wood

Metals

Plastics

Fabrics

Wo

od

Metals

Plastics

Fab

rics

PVA

PVA

Contact Adhesive

Contact Adhesive

Contact Adhesive

Contact Adhesive

Contact Adhesive

Contact Adhesive

Contact Adhesive

Contact Adhesive

Contact Adhesive

Latex Adhesive

Solvent Cement

Epoxy Resin

Epoxy Resin

PVA