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