About PVC Plastisol
Plastisols are fluid
forms of vinyl plastic molding and coating compounds which make
a variety of unique molding processes available. Plastisols are
100% solids. Most plastisols used are low to medium viscosity materials
(having a viscosity between 1000 and 10,000 centipoises at 2.5 rpm
on the Brookfield Viscometer). Some PVC plastisols used in the textile
screen printing industry have viscosities as high as 4 million cps.
at 0.5 rpm. Properties will vary depending on the application the
plastisol will be used for.
Plastisols are very
versatile, offering numerous application and processing possibilities.
Cured (or fused) plastisol has the same basic physical properties
commonly associated with other vinyls: flexibility, toughness, outdoor
stability, abrasion and chemical resistance. Plastisols can be custom
formulated to fit your application and processing needs.
Plastisols are available
in formulations of hardnesses ranging from the Shore D (very hard
compounds) to Shore 00 (very soft-soft plastic worm types). Many
different properties can be incorporated into plastisols. Some of
the available properties are low temperature flexibility, non-marring,
nonflammable, acid resistance, abraision resistance, slip, as well
as many others.
Processing of PVC
'Cure' (or fusion)
of plastisols is a physical change of the resin being solvated by
the plasticizer on heating. The fusion process changes the plastisol
from a liquid to a solid state and brings about ultimate physical
properties. As complete fusion is reached clarity, surface gloss,
tensile and tear strength reach their maximum. Fusion is completed
at approximately 350 to 400°F. Usually processing is done between
350° and 500°F to speed heat transfer. The time required
to reach fusion is a function of the temperature and thickness of
the material. When the heating process is complete the material
is cooled. Through this curing process the plastisol transforms
from a liquid material to a solid material with good physical properties.
There are many different
curing methods which include oven, molten salt, microwave (for very
soft compounds), hot plates, and radiant heat to name a few.
of PVC Plastisol:
to acids, alkalines, detergents, oils and some solvents.
Tensile (psi) 200-4000; Elongation 100-600%; Tear 100-500 #/in.
to certain oils, mild detergents, etc.; this varies with temperature.
to metal/ demoldable
Good to excellent, usually at least 10 years.
7.9 to 20.5 #/gallon
Chemical Foam to 10 #/ft 3
Glossy, Textured, Flat
10 Shore00 to 80 ShoreD
Can be formulated with FDA approved materials
/ Dip Coating:
Used when coating metal parts or making parts (caps) to be put on
to other substrates that can't take the heat.
A "hot dip" would use a heated substrate, such as metal,
while a "cold dip" would use a cold substrate such as
a supported glove. This process is used for tool handles, wire racks,
supported and unsupported gloves and miscellaneous parts.
Used for such products
as athletic padding, mats, life preservers, auto gaskets. These
can be dip molded, slush molded, casted, roll coated, etc. with
many different textures.
This process is used
when part of the mold is open. Used for such products as boots,
toys, automotive parts, etc.
This process is for
molding closed parts such as beach balls, squeeze toys, bicycle
misc. industrial coatings, food can coatings, etc.
Casting / Molding:
Used when making
such products as: toys, bottle cap liners, gaskets, floor mats.
Used when making such
products as auto air and oil filters, hood and trunk lining.
Used to apply a layer
of Plastisol to fabric, release paper, carpet, coil coating, unsupported
For use when coating
vertical pieces and hard to coat pieces.
Used when Printing
on textile and other substrates.
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