| There
are a lot of different adhesives all manufactured
all for various purposes. Adhesives work on several
different purposes.
Adhesives table
| |
Fabric |
Plastics |
Metals |
Woods |
Woods |
PVA
|
Contact Adhesive
|
Contact Adhesive
|
PVA or Synthetic resin
|
Metals |
Contact Adhesive
|
Contact Adhesive
|
Expoxy Resin
|
Contact Adhesive
|
Plastics |
Contact Adhesive
|
Solvent Cement
|
Expoxy Resin
|
Contact Adhesive
|
Fabric |
Latex Adhesive
|
Contact Adhesive
|
|
PVA
|
PVA – (wood
to fabric)
Polyvinyl acetate is a water based
adhesive which is coloured white. PVA works when
it soaks into the surface of the wood and sets
once all the water is absorbed. PVA makes an extremely
strong bond and is often stronger than the actual
wood fibres itself. PVA is good to for gluing
wood to fabric.
Synthetic resin –
(wood to wood)
Synthetic resin is a waterproof
adhesive. It needs to be mixed into a creamy consistency
with water for it to set hard. Chemical hardening
then takes place and the adhesive will set as
a hard but brittle adhesive. Synthetic resin will
set hard within a pipe, so ensure you don’t
wash the residue down a sink or basin. Synthetic
resin is good to for gluing wood to wood.
Solvent cement –
(plastic to plastic)
There are many types of solvent
cement however the most common is dichloromethane.
Dichloromethane works by dissolving the surface
of hard plastics such as Acrylic and High impact
polystyrene. Solvent cement is very dangerous
and will give off fumes so it is important to
use this within a well ventilated room. Solvent
cement is good to for gluing plastic to plastic.
Hot glue guns –
(Card to card / modelling)
Hot Glue guns are used a lot in
schools for quick modelling of work. However these
can be rarely used on final products as it is
not strong enough. Hot Glue guns are good to for
gluing card to card and modelling materials together.
Epoxy resin –
(Plastics to metal, metal to metal)
Epoxy resin is a very flexible but
very expensive adhesive. Epoxy resin will glue
most dry and clean materials together. The Epoxy
resin sets when equal amounts of resin and hardener
are mixed together. It then chemically sets to
form a very hard material. Epoxy resin is good
to for gluing plastics to metals and metals to
metals.
Contact adhesive -
(plastics, woods to metals, metals to fabrics,
metals to plastics and plastics to fabrics)
Contact adhesive works when
both material surfaces are coated and are allowed
to become touch dry. Adhesion works as soon as
the two touch dry surfaces meet. Contact adhesives
solvent fumes are tremendously dangerous and good
ventilation is imperative. Contact adhesive is
good to for gluing woods to plastics, woods to
metals, metals to fabrics, metals to plastics
and plastics to fabrics.
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Mr DT says 'Read the text above and then answer
these questions below'. Write your answers
on a sheet of paper, dont forget to write
your name on the sheet!:-
1). What does PVA stand for?
2.) Write a brief description about synthetic
resin?
3.) How does solvent cement work?
4.) What are glue guns good for?
5.) How does epoxy resin set?
6.) What is epoxy resin good for gluing?
7.) What is contact adhesive good for gluing?
8.) How does contact adhesive work?
9.) Which adhesive above can glue together
the most amounts of different materials?
10.) How does PVA work?
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