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,
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Scorch - Premature vulcanization of a rubber
compound, generally due to excessive heat history.
Also see Mooney Scorch;
Scorching - A term frequently used to denote
premature vulcanization of a rubber compound, occurring
on a mill or calender, or in an extruder. Same as
burning or "setting up".
Scraper Rings - A ring which rides tight
against a rod, with a sharp lip to scrape or wipe
off excess oil, dirt or dust in a hydraulic or pneumatic
Scrapers - Also, called a wiper ring - A
ring which rides tight against a rod, with a sharp
lip to scrape or wipe off excess oil, dirt or dust
in a hydraulic or pneumatic cylinder.
Seal - An elastomeric ring-shaped component
used in a constantly moving, dynamic application
- either reciprocating or rotating shaft - providing
a near positive no leak mode in a hydraulic cylinder,
ram, mixer or gear box - as examples. (Note:
no sealing device is absolutely 100% positive).
Seal rings can be u-shaped, v-shaped, o-shaped,
metal inserted, radial lipped, multiple lipped or
a simple flat ring.
Seal Cages - A special device used to assist
a seal ring.
Seal Kits - Any group of seals, o-rings,
wiper rings and back-up rings used to repair a specific
Seal-Master Machine Instant Seal Making Machine
- A special CNC controlled machine for making seals
Seats - A stationary ring which is pressed
into a housing and acts as the matching face of
a mechanical seal.
Shaft Repair Kits - A package of seals which
includes all seals needed to repair the rod end
of a hydraulic or pneumatic cylinder.
Shaft Seal & Packings - Any seal ring
used on the rod of a hydraulic ram.
Shallex - A brand name for vee packings,
chevron or parachute packings.
Sheet Materials - Rubber or fiberous material
used to make gaskets.
Shims - Flat, thin metal gasket-like parts
used as spacers to position machiery or align equipment.
Shore A Hardness - An indentation method
of rating the hardness of rubber using a Shore Durometer
with the A scale from 0 to 100.
Shrinkage - Contraction of molded rubber
Skin - A relatively dense layer at the surface
of a cellular material.
Simulation - The practice of mimick- ing
some or all of the behavior of one system with a
different, dissimilar system.
Simultaneous Engineering - A way of simultaneously
designing products, and the processes for manufacturing
those products, through the use of cross functional
teams to assure manufacturability and to reduce
Single Acting Seals - Rings which are designed
to seal only in one axial direction.
Slip O-rings - A type of ring which fits
over an o-ring to relieve friction.
Smoke sheets - Plantation natural rubber
sheets that, after passing through a mill that puts
the conven- tional ribbing design on them, are washed
and hung on racks in a smoke house where they undergo
a combined smoking and drying process.
Snap-in Wipers - A rod wiper which is made
from one homogeneous material, either rubber or
polyurethane, which is designed to snap-fit into
a matching machined groove.
Solosele - The brand name of a particular
single acting u-cup seals.
Spacers - A ring with flat sides to provide
specific dimensional spacing between two components.
Special Characteristics - Product and process
characteristics designated by the customer including
govern- mental regulatory and safety; and/or selected
by the supplier through knowledge of the product
Specific gravity - The ratio of the mass
of a unit volume of a material to that of the same
volume of water at a specified temperature.
Speedi Sleeves - The name of a thin, round
tube which slips over a rotating shaft to provide
a new, clean sealing surface for a rubber lip oil
or grease seal.
Splice - A joint or junction made by lapping
or butting edges, straight or on a bias, and held
together through vulcanization or mechanical means.
Spring Energized Seals - Any sealing ring
that utilizes a metal garter spring or finger spring
to assist in energizing the seal when there is not
Spring Loaded Seals - See spring energized
Sprue - (1) The primary feed channel that
runs from the outer face of an injection or transfer
mold to mold gate in a single cavity mold or to
runners in a multiple cavity mold; (2) The piece
of material formed or partially cured in the primary
Sprue mark - A mark, usually elevated, left
on the surface of an injection or transfer molded
part, after removal of the sprue.
Squeeze - Cross section diametrical compression
of O-ring between bottom surface of the groove and
surface of other mating metal part in the gland
State of cure - The cure condition of a vulcanizate
relative to that at which optimum physical properties
Stat-O-Seals - See bonded seals.
Stem Packing - A type of homogeneous or multi-braided
packing used on the stem of a valve to stop leakage.
Stepseal - A seal ring with a step cut groove
to match up against a housing machine to fit.
Stoppers - See plugs.
Stress - Force per unit of original cross
sectional area required to stretch a specimen to
a stated elongation.
Stress relaxation - The decrease in stress
after a given time of constant strain.
Substrate - A material upon the surface of
which an adhesive promo- ter is applied for any
purpose such as bonding or coating.
Subsystem - A major part of a system which
itself has the charac- teristics of a system, usually
consisting of several components.
Swelling - The increase in volume or linear
dimensions of a specimen immersed in a liquid or
exposed to a vapor.
Swelling - The property of raw or unvulcanized
rubber absorbing organic liquids such as benzene,
gasoline, etc., arid swelling to many times its
original volume. in a general sense, it may be any
increase in volume of a solid substance caused by
the absorption of a liquid.
Switch Seals - Seals used in electrical switching
devices to keep moisture out.
System - A combination of several components
or pieces of equipment integrated to perform a specific