Specification section 3.4

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Presentation transcript:

Specification section 3.4 Adhesives Specification section 3.4

What do you need to learn? The advantages and disadvantages of each adhesive What materials each adhesive is suitable for

PVA (Polyvinyl acetate) 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.

Wood Fabrics Plastics Metals Wood Metals Plastics Fabrics Adhesives 3.4 Contact Adhesive Contact Adhesive Wood PVA PVA Fabrics Plastics Metals Wood Contact Adhesive Contact Adhesive Epoxy Resin Contact Adhesive Metals Contact Adhesive Solvent Cement Epoxy Resin Contact Adhesive Plastics Latex Adhesive Contact Adhesive Contact Adhesive Fabrics PVA