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Types of Adhesives
- and
acrylate adhesives offer fast bonding at room temperature and are highly
resistant to environmental conditions. They are able to stick to oily
surfaces and many types of materials, including most metals, plastics,
glass, ceramics and wood.
- are
industrial spray adhesives that offer convenience and performance for
general purpose, foam and fabric, upholstery, screen printing, labeling,
palletizing, trim and laminating, high bond high strength, high strength
fast tack, pressure sensitive repositionable and temporary or permanent
bond applications.
- cure
in the absence of oxygen. Curing is catalyzed when bonding with surfaces
where metallic ions are present.
- -
- ,
or electrically conductive adhesives, offer electrical and/or thermal
conductivity between components.
- are
fast setting adhesives commonly referred to as "crazy glue." Only
a small amount of these one-component adhesives is necessary to form
a rigid plastic layer that has high strength.
- , or
epoxy resins, are raw materials that can be formulated to make paints,
coatings or adhesives.
- are
very strong and highly heat and chemical resistant. They can be formulated
to be either flexible or rigid, transparent or opaque, fast setting
or extremely slow setting, making them appropriate for nearly any use.
- ,
or thermal adhesives, are viscous liquids at elevated temperatures
and generally set quickly when cooled. Types include fast set, delayed
set and pressure sensitive and common uses are for bookbinding, product
assembly and box and carton heat sealing.
- are
substances that are used for bonding in thin layers. They come on sheets
of release paper that are wound in rolls to be used in lamination presses
or applied by hand with a plastic squeegee or hand roller. The liner
is then removed from the adhesive.
- are
a newer form of adhesive technology developed to offer superior performance
compared to acrylic adhesive, which can be brittle and less reliable.
Methacrylates provide good gap fill, excellent impact resistance, flexibility
and peel and shear strengths, medium to fast curing, and tolerance
of dirty surfaces.
- ,
or UV adhesives, are cured by exposure to ultraviolet light. These
adhesives are commonly used in fiber optics and dentistry.
- bond
with a wide range of materials and are tough and flexible at low temperatures
but weaken due to high temperatures and contact with moisture.
- are
used in membrane press operation. They are heated to the proper temperature
for lamination in the press and then quickly set for the unloading
and trimming of the piece.
- react
with moisture in the air or the bonding substrate to form a cured polymer
layer with high strength. Silicone and polyurethane are the most common.
- come
as two-part formulas or pre-mixed, which need to be mixed very well
to give the best quality tough yet flexible bonds that they can. They
can form strong bonds to most materials and are more flexible than
epoxies.
- can
not be softened with heat once they are set. Thermoset materials include
epoxies, polyesters, silicones, rubbers and polyurethanes.
- consist
of two or more components that react to become chemically cross-linked.
Their higher costs are related to their extremely high bond strengths
and exceptional performance, such as epoxies, polyurethanes, acrylics,
and silicones.
- ,
or aqueous adhesives, use water as a carrier or diluting medium. They
set when the water evaporates or is absorbed by the substrate.
Adhesives Terms
- A
substance that is resistant to adhesion and can be used as a non-sticky
surface coating for baking tins, frying pans, metal pots, etc. Examples
are Teflon and silicone.
- Something bonded
to something else through the use of an adhesive.
- How crack
resistant a bonded adhesive is when stretched and strained.
- Hardening or solidifying
by cooling, drying or crystallization. Also referred to as setting.
- Covers large
areas with a relatively heavy coating of adhesive. Parts are passed through
a "waterfall" of coating in an automated conveyor line.
- Can be an adhesive
coating that hardens to form a protective layer to prevent degradation
of whatever it encapsulates, such as electronic components.
- The maximum
load an adhesive bond will sustain when subjected to repeated stress. - An adhesive's ability to resist shock from
a direct perpendicular physical blow. - A measurement of the bond strength of an adhesive
determined by the force per unit width required to separate bonded materials
by applying stress in a "peeling" motion. - An easily removable protecting and/or carrier sheet
for certain adhesives, commonly film and laminating adhesives. - Thick, sticky hydrocarbon plant secretions great for varnishes
and adhesives. - A method for applying adhesive, the simplest form
of which is using a paint roller, but usually the coating rolls are part of a
roll coating machine that precisely controls layer thickness, does not allow
waste and is good for large surfaces at high speeds.
- A method
of applying adhesive in specific patterns by way of forcing it through
a screen using a squeegee. The size of the screen openings determines
the coating thickness.
- How resilient
a material, such as a cured adhesive, is to a parallel stress acting
upon it, which can cause an irreversible continuous, non-fracturing deformation. - The material surface upon which an adhesive is spread
for bonding or coating. More specifically adherend. - A measurement of an adhesive's bond strength
based on how resistant it is to tension, being stretched and strained. - A fast method of applying a thin layer of adhesive
in a precise pattern, such as on envelope flaps. Usually done using rollers;
flat plates can also be used. - An adhesive's bond strength immediately after
it has been immersed in a liquid under specified conditions of time, temperature
and pressure.
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