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Plastic Tank Terms
–
A substance added to a polymer to increase the effectiveness, but not
the strength, of the polymer. Examples of additives include flame-retardants,
anti-static compounds, pigments and lubricants.
– The process in
which atmospheric force is applied to a laminate using an elastic or woven
material.
– A flaw that forms
between the laminate layers or between the laminate and the gel coat film
of a fiberglass tank.
(http://www.blowmoldedplastic.com)
– The formation of a hollow object, such as a tank, by using air
to expand a hollow tube, called a parison, against the internal walls
of a mold.
– The process in which
a mold is filled with a mixture of resin, fillers and/or fibers to form
the end product, such as a tank.
– A process
in which layers of polymer and reinforcement materials are applied to
a single or open mold, producing one finished cosmetic side.
– A polymer made up
of two monomers in which each repeating unit in the chain consists of
units of both monomers.
– Very thin cracks in
a polymeric material caused by chemicals or other agents, such as ultraviolet
radiation.
– The
length of the molecular or monomeric units in a polymer chain. The degree
of polymerization determines the properties of the polymer.
– The breakdown
of a polymer to its original monomers or to a polymer of a lower molecular
weight. Depolymerization often occurs when a polymer is exposed to chemicals
or certain environmental conditions, such as high temperatures.
– A piece of equipment,
usually consisting of metal, through which a substance, such as plastic,
is forced in order to provide shape to the substance.
(http://www.extrudedplastics.com)
– In plastic shaping, the process of softening plastic through the
application of heat and pushing the plastic through a die.
– Typically inert organic
or inorganic material that is added to resins, plastics or gel coats,
in order to change the properties, increase volume or decrease the cost
of the end product.
–
Also called “GFRP (glass fiber reinforced plastic),” “GRP
(glass reinforced plastic)” or “RP (reinforced plastic),”
it is a durable, rust-proof material that is a combination of glass and
resin.
– A surface coat of
colored or clear polyester resin that cosmetically enhances fiberglass
laminate and provides it with good weatherability.
– The process in
which fiberglass and resin layers are built up manually using hand rollers,
spray equipment and brushes.
– The
process of joining two pieces of plastic by blowing heated air or gas
to melt the plastic pieces.
(http://www.injection-molded-plastics.net)
– The process of creating an object, such as a tank, by applying
pressure to molten plastic in order to push the plastic into a mold. The
mold is then cooled to produce the final plastic form.
– A composite formed
by lamination, a process in which thermoset polymers and fiber reinforcement
are layered.
– A hollow, heat-resistant
container in which liquid substances can be formed into solid shapes by
allowing the fluid to solidify within the mold cavity.
– The most basic polymeric
unit, usually a liquid or a gas, consisting of molecules from the same
organic substance.
– The ability of
liquids and gases to flow through a substance. Low permeability is advantageous
in plastic tank resins.
(http://www.plastic-materials.com)
– A material whose essential ingredient is an organic substance
of large molecular weight and whose end state is solid. Plastics can be
shaped by flow at some stage of the manufacturing process.
– A material added
to a plastic to make it more workable and flexible.
– Two or more monomers
bonded together through a chemical reaction. Each polymer consists of
a chain of repeating monomers.
– Water fit for
human consumption.
– Petroleum
or any hazardous substance stored in an industrial tank. Hazardous substances
are defined in the Comprehensive Environmental Response, Compensation,
and Liability Act (CERCLA).
– Substance added
to a polymer to increase the strength of the plastic. Examples include
clay, mica and glass fibers.
– A class of polymers,
or plastics, chemically different to naturally occurring resins, which
are sticky substances obtained from certain trees and plants. Examples
of resins include polyethylene, polyurethane and acrylics.
(http://www.rotationallymoldedplastics.com)
– Also called “rotomolding,” it is the formation of
a hollow object, such as a tank, by simultaneously rotating and heating
a mold filled with thermoplastic resin powder. As the mold rotates, the
resin evenly coats the mold walls and is then cooled into the final form,
providing seamless molding at a low manufacturing cost.
– Cracking that
occurs as a result of mechanical stress. In most cases, tiny cracks caused
from exposure of the plastic to chemicals or ultraviolet radiation are
already present, so that when stress is applied to the plastic, the cracks
enlarge and spread, creating a greater fracture.
– Category of
plastics that have the potential to soften and reform when heated, and
harden again during cooling. During the process, the physical makeup of
the plastic does not change.
– Category of plastics
that cannot be reformed upon reheating. Thermosets remain permanently
hard.
–
Tank system storing a regulated substance, such as petroleum, in which
at least 10% of the tank, tank piping and other equipment associated with
the tank is located underground.
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