Cap Material
Thermoset or Phenolic (Bakelite)
These
caps are known for providing the widest range of chemical compatibility and for
being the most temperature tolerant of plastic closures. They also provide the
most consistent adherence to close dimensional tolerances. Ideal for
pharmaceutical applications. Thermoset closures cannot be remelted after they
are formed. Common resins include urea, phenolic, and melamine.
Metal
Metal
caps offer the widest range of temperature tolerances and are very resistant to
fracture from impact. Metal caps are great for industrial and food
applications. A metal closure is manufactured from either steel (coated with
anti-corrosive coating of either chromeplate or tinplate) or aluminum.
Polypropylene (Thermoplastic)
Polypropylene caps are known for good impact
strength, cost effectiveness, and pliability. They can be remelted after they
are formed.
Liner Material
F217 & PTFE Lined Caps
Foam
backed PTFE liners resist attack from virtually all chemicals at room
temperature and provides resilience for a tight seal with a low moisture
transmission rate. F217 has a low density foam core between two solid layers of
LDPE. Uses include: Analytical lab samples, high purity chemicals, strong
acids, solvents, environmental samples, pharmaceuticals, and diagnostic
reagents. The color green easily identifies the PTFE liner system. Available in
Thermoset and Phenolic caps.
Pulp/Vinyl Lined Caps
Phenolic
caps with pulp and vinyl liners are perfect for general use. The liner is made
of a vinyl coating applied to high density polyethylene coated paper and then
it is laminated to pulpboard. This general purpose liner is commonly used for
food, beverage, medical and chemical applications packed at less than 120° F.,
including mild acids, alkalis, solvents, alcohols, oils and aqueous products;
not recommended for active hydrocarbons or bleaches. Available in Phenolic
caps.
PolyCone Lined Caps
These caps form an exceptionally tight seal and
offer a good chemical barrier. This liner molds itself around the sealing areas
of the finish as the cap is screwed on, virtually eliminating leakage,
evaporation, contamination, binding and backing off. Great for everything from
liquids, to soaps, to macro-invertebrates. Available in Phenolic caps.
Rubber Lined Caps
Black
phenolic caps with rubber liners are autoclavable. This liner is FDA approved
for food and pharmaceutical applications. Excellent properties of resilience,
resistance to moisture vapor and relatively low gas transmission. Also widely
used for packaging injectables. Great for culture work. They also provide the
most consistent adherence to close dimensional tolerances. Available in
Phenolic caps.
Rubber Backed/PTFE Faced Caps
Designed for the ultimate in product safety.
Autoclavable PTFE provides totally inert inner seal and surface facing the
sample or product.
.030 Solid Polyethylene Lined Caps
Caps with solid PE liners offer good chemical
resistance and low moisture vapor transmission rate and is great for nail
polish remover and higher concentration acids & alkalis. Good for non-oil
products filled at room temperature. Because this lining system is paperless,
your samples will not be contaminated with fiber or paper particles from the closure.
Available in Phenolic caps.
Aluminum Foil Lined Caps
These caps are typically used for food
applications. Free of odor and taste problems. Also can be used for non-acid,
non-alkaline products. Great for organic solvents, chrome cleaners, brake
fluids and mineral oils. Available in Phenolic and Metal caps.
Tin Foil Lined Caps
These
caps offer good chemical resistance and are typically used with solids and
powders. Good resistance to hydro-carbons, alcohols, ketones and oils. Not
recommended for acids and alkalis. Available in Phenolic caps.
SturdeeSeal® PE Foam Lined Caps
These polypropylene caps have excellent sealing
characteristics and offer good chemical resistance including acids, alcohols,
alkalis, aqueous products, cosmetics, and household oils.
F422 HDPE Foam Lined Caps
Also
called Acid Caps, these polypropylene caps are acid resistant. This F422 liner
is comprised of a .38” LDPE core sandwiched between identical layers of .002” -
.003” virgin HDPE.
Unlined Caps
Unlined polypropylene closures are available in
white or black. These caps are autoclavable and are suitable for many dry
products.
Plastisol Lined Caps
Metal caps with a Plastisol liner offer
excellent resistance to mild acids as in food products. Permits “hot fill” operations
to effectively produce a vacuum seal.
Pulp/Polyethylene Lined Caps
These metal caps are a great general purpose
closure. They are ideal for powders and non-acidic food products and consumer
products such as jar candles and honey.