11.1.8 Define adhesive.
Adhesives are available in many forms and are suitable for specific materials in specific situations.
Complete the table:
Type of Adhesive
Brief description and examples where appropriate
Natural adhesives
Synthetic adhesives
Drying adhesives
PVA
Latex
Cyanoacrylate
Contact adhesives
Hot melt adhesive or hot glue
Reactive adhesives
11.1.7 Discuss how permanent joining techniques lead to planned obsolescence and environmental issues
What does planned obsolescence mean?
If products, components and subassemblies are permanently joined and are therefore difficult to repair, reuse or
recycle, what effect can this have on the environment?
If permanent joining methods have a negative impact on the environment, why do companies continue to
manufacture products using these techniques?
11.1.9 Identify a range of adhesives suitable for joining metals, woods and plastics
You should make yourself familiar with this table of information.
Adhesive
Material
Description and Use
Contact adhesive e.g. Evostick
Plastic laminates
A thick brown rubbery glue that is spread on both
surfaces and allowed to dry before placing together.
Copydex
Fabrics
A white rubbery glue, especially made for gluing
fabrics.
Epoxy resin e.g. Araldite
Metal, plastics to other materials
A two-part mix that will stick almost anything. Slow to
set fully.
Polystyrene glue
Rigid polystyrene
Commonly called model glue, as used in kit
construction.
Polyvinyl acetate (PVA) e.g.Resin
Expanded polystyrene, timber
(interior), paper and card.
A white ready mixed glue. Not waterproof.
Synthetic resin e.g. cascamite
Timber (exterior)
A white powder that is mixed with water. Some types
have a separate hardener.
Tensol No. 6
Acrylic to acrylic
Ready mixed adhesive. Interior use only. Use of tape
to mask unjointed areas is suggested.
Tensol No. 7
Acrylic to acrylic
Waterproof adhesive. A two-part mix
for exterior use.
Tensol No.53
PVC
Can be glued readily. Acetone used as a glue Solvent.
11.1.10 Discuss the advantages and disadvantages of using adhesive bonding in products
What are the advantages of using adhesive bonding in comparison to other permanent joining techniques?
Complete the table:
Advantages of using adhesive bonding in comparison to other permanent joining techniques
Preparation of surfaces
Clamping
Bonding time
Type of material
Health and safety
What are the disadvantages of using adhesive bonding in comparison to other permanent joining techniques?
Complete the table:
Disadvantages of using adhesive bonding in comparison to other permanent joining
techniques
Preparation of surfaces
Clamping
Bonding time
Type of material
Health and safety