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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Radial Shaft Seals - Also called grease seals,
rotary seals or shaft seals. Made of rubber to seal
grease in a housing with a rotating shaft.
Rebound - Rebound is a measure of the resilience,
usually as the percent- age of vertical return of
a body which has fallen and bounced.
Rebound test - Method of deter- mining the
resilient properties of vulcanized rubber, by measuring
rebound of a steel ball or pendulum falling from
a definite height onto a rubber sample.
Register - The accurate matching of the plates
of a mold.
Reinforcing Agent - In rubber compounding,
a finely-divided substance or filler which, when
properly dispersed in rubber, produces improved
physical properties in the vulcanized product, i.e.,
greater energy of resilience, greater resistance
to abrasion, higher modules of elasticity and tensile
strength Certain grades of furnace blacks are the
most important reinforcing agents for black stocks.
For light-colored stocks, calcium silicate, precipitated
calcium carbonates, silica and clay are the most
Reliability - The probability that an item
will continue to function at customer expectation
levels at a measurement point, under specified environmental
and duty cycle conditions.
Reproducibility - The variation in the average
of measurements made by different operators using
the same gage when measuring identical characteristics
of the same parts.
Resilience - The property of a material that
enables it to return to its original size and shape
after removal of the stress which causes the deformation.
Resilience - The energy returned by vulcanized
rubber when it is suddenly released from a state
of strain or deformation. The returned energy, expressed
as a percentage of the original potential energy,
is a measure of the resilience. Various rebound
testers are used to measure rebound (Bashore, Lupke).
Retarder - Any substance whose presence ill
relatively small proportion retard a chemical reaction.
Specifically, a substance which when added in small
proportion to a rubber compound, retards the rate
of vulcanization. An anti-scorching agent; examples,
phthalic anydride, salicylic acid.
Reversion - (1) A deterioration of physical
properties that may occur upon excessive vulcanization
of some elastomers, evidenced by a decrease in hardness
and tensile strength, and an increase in elonga-
tion; (2) A similar change in proper- ties after
air aging at elevated temperatures. Natural rubber,
butyl, polysulfides and epichlorobydrin polymers
exhibit this effect (extreme reversion may result
in tackiness). Most other polymers will harden and
suffer loss of elongation on hot air aging.
Reversion - The softening of some vulcanized
rubbers when they are heated too long. Usually accompanied
by an increase in extensibility, a decrease in tensile
strength and a lowering of the stress required to
produce a given elongation. Extreme reversion may
result in tackiness; the rubbers "revert"
to an unvulcanized then to a non-polymeric condition.
Rheology - The science of deformation and
flow of matter. Deals with the laws of plasticity,
elasticity and viscosity and their connections with
paints, plastics, rubber, oils, glass, cement, etc...
Rheometer (Monsanto) - An oscillating disk
cure meter used for determining vulcanization charac-
teristics of a rubber compound.
Rimseal - A sealing device used on the rim
of round plate or rim of a wheel.
Rings - Round sealing devices.
RMS - Root Mean Square - The measure of surface
roughness, obtained as the square root of the sum
of the squares of micro-inch deviation from true
Rod Seals - Any seal used on the rod of a
hydraulic or pneumatic cylinder made from rubber
Rollers - A round, flat ring used as a wheel
Rotary Seals - Seals used on rotating shafts
- see lips seals, grease seals, oil seals.
Rotocure - Rotory press.
Roto Glyd - A flat plastic, PTFE or Teflon
ring used on a rotatinfg shaft.
Rubber - A material that exhibits elastic
properties that allow recovery from large deformations
quickly and forcibly. A tough, waterproof substance
obtained through polyme- ric synthesis or in natural
form from the sap of various species of plants or
Rubber Latex - Colloidal aqueous emulsion
of an elastomer.