for Seals, Gaskets, O-Rings, Orings, Rubber.
the terms and definitions for seals, seal, orings,
gasket, gaskets, hydraulic seals, hydraulic seal,
metric seals, metric seal, o-rings, o-ring, viton,
teflon, silicone, rubber, nitrile, ucup, plastic,
metric orings, injection molding, oil seals, packings,
parts, molding, machining.
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Packaging - A unit that provides protection
and containment of items plus ease of handling by
manual or mechanical means.
Packing - An adjustable sealing device on
a ram, valve stem or pump shaft --- old technology
and leakage is required for lubrication. If packing
leaks, it is simply tightened slightly to 'control'
the leakage. For pumps and valves, packings can
be rope-like, braided into continuous lengths and
then cut to size to fit a shaft. For hydraulic applications,
v-shaped fabric reinforced rubber rings are used.
Early hydraulic packings were made from leather.
For a rubber o-ring, that particular item can be
found called a seal, a gasket and a packing ring
- even in U.S. government technical specifications
dating back 50 years.
Pads - A rubber part used as an anti-vibration
Parachute Packings - Also called V-Packing,
Vee packing, Chevron Packing, Parachute packing
or v-set packing. A complete vee packing set contains
multiple "V" shaped sealing rings stacked and nested
together with a male adapter on one end and a female
adapter on the other end.
Parbacks - A back-up ring with a concave
shape on one side, used as an anti-extrusion ring
for an o-ring.
Permanent set - The amount by which an elastic
material fails to return to its original form after
Permanent Set - The amount by which an elastic
material fails to return to its original form after
a deformation. in the case of elongation, the difference
between the length after retraction and the original
length, expressed as a percentage of the original
length, is called the permanent set. Permanent set
is dependent on quality and type of rubber, degree
and type of filler loading, state of vulcanization,
and amount of deformation.
Permeability - To permit passage of gas through
the molecular structure of a given material.
Piston Bearing Rings - Also called guide
rings, wear rings, piston guide rings.
Piston Guide Rings - Also called guide rings,
wear rings, piston rings usually made from nylon
Piston Rings - Any ring used on the piston
of a hydraulic or pneumatic cylinder.
Piston Seals & Packings - Any seal or
packing ring used on the piston of a hydraulic or
Piston T-Seals - A "T" shaped rubber seal,
with back-up rings of a harder material on each
side, used as a piston seal.
Plasticity - (1) A measure of the resistance
to shear of an unvulcanized elastomer; (2) A tendency
of a material to remain deformed after reduction
of the deforming stress to or below its yield stress.
Plasticizer - A substance that softens or
plasticizes another substance through its solvent
Plunger Pump Seals - Packing seal rings used
to seal the plunger of a reciprocating pump.
Plunger Seals - Sealing rings used on a plunger.
Plugs - A cone shaped rubber part used
to be forced into a tube end or hole to make a complete
Pneumatic Seals - Any seal or packing ring,
usually flexible rubber, used to seal against compressed
air instead of hydraulic fluid or other liquid.
Pock marks - Uneven blister-like elevations,
depressions, or pimpled appearance.
Poisson's Ratio - The ratio of lateral concentration
per unit of diameter to longitudinal extension per
unit of length in a bar of material longitudinally
stressed. For a body which does not change its volume
on deformation, it is 0.5. For metals, the ratio
is usually considerably less than 0.5. In the case
of vulcanized rubber, pure gum, having practically
no volume change on extension, shows a ratio of
approximately 0.5 for small deformations; compounded
rubber may increase in volume on extension, consequently
the ratio drops below 0.5. For rubber the ratio
is constant only for small extensions.
Polymer (a) - A material formed by the joining
together of many (poly) individual units (mar) of
Polymer (b) - A polymer is a very long chain
of units of monomers prepared by means of an addition
and/or a condensation polymerization. The units
may be the same or different. There are copolymers,
dipolymers, tri- or terpolymers, quadripolymers,
high polymers, etc...
Porosity - The presence of numer- ous small
holes or voids.
Post cure - Heat or radiation treatment,
or both, to which a cured or partially cured thermosetting
plastic or rubber composition is subjected to enhanced
the level of one or more properties.
Preliminary Bill of Material - An initial
Bill of Material completed prior to design and print
Preliminary Process Flow Chart - An early
depiction of the anticipated manufacturing process
for a product.
Press-in Wipers - A wiper or scraper ring
for a hydraulic cylinder which has a metal outside
diameter so that it can be press-fitted into a housing.
Pressure - (No, Low, Poor) - May refer to
inadequate pressure in mold/press, oven heater or
autoclave during Cure. Symptoms may be porosity,
unfills, blister, low adhesions, etc...
Process Failure Mode and Effects Analysis (PFMEA)
- An analytical technique used by a manufacturing
responsible engineer/ team as a means to assure
that, to the extent possible, potential failure
modes and their associated causes/mechanisms have
been considered and addressed.
Processing Aids - Waxes, low molecular weight
polyethylene, metal soaps, petroleum oils, and other
agents which dissolve or lubricate rubbers, soften
them and act as processing aids.
Product Assurance Plan - A part of the Product
Quality Plan. It is a prevention-oriented management
tool that addresses product design, process design,
and when applicable software design.
Production Trial Run - Product made using
all production tools, processes, equipment, environment,
facility; and cycle time.
Protectors - A rubber or plastic cap or cup
shaped ring used to protect threads or fragile items
during shipping or assembly.
Proto-Types - A part that is made during
the design process to determine the feasibilty or
suitability of a project.
Proto Types - See proto-types
Pusher Rings - A ring that fits against another
sealing device to push it in order to activate it
or enegize it in the absence of pressure or in low