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Article #266: Adhesive - Everything sticking together.

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An adhesive is a substance that is used chemicals that are not adhesive until
to fix or bond two surfaces together. they are mixed together; then they
They come from very small powered rapidly solidify into a chemical bond
substances to incredibly strong. that is very difficult to separate on a
Adhesives can be natural or synthetic but flat surface.
more commonly are the latter, man made Hot or 'thermoplastic' adhesives are the
glues produced for anything from type often found in workshops and are
household repairs to industrial bonding. what many of us used in school. They are
The original adhesives were natural, often loaded in a solid state into a glue
plant resins or animal substances. gun which heats the substance, letting it
Ancient Egyptians used animal glues and run onto the surface that needs it. The
Native Americans used rendered buffalo surface is pressed against the desired
hooves. Natural adhesives are usually object and generally left under light
classed together and are separate from pressure until the glue has cooled. Upon
synthetic ones which themselves come in a cooling the two surfaces should be very
variety of forms. The cheapest and difficult to separate.
weakest are usually simple solvents that The glues used on masking tape are
evaporate and leave a adhesive bond, pressure sensitive and form a bond when
basically drying out, like the white glue pressed into place, but can be peeled
used by younger children in crafts that away at a later date. They also come in
can be painted onto a surface. more permanent forms that are used in
A fairly common form of adhesive is safety labels and sound dampening seals
reactive; the well known two part epoxy among other things.
comes under this group. These are two






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