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EXTRUSION
Distortion, under pressure, of portion of seal into clearance
between mating metal parts.
FILLER
Chemically inert, finely divided material added to the polymer to
aid in processing and improving properties of abrasion
resistance and strength - gives it varying degrees of hardness.
FLASH
Excess rubber left around rubber part after molding due to space
between mating mold surfaces; removed by trimming.
FLEX CRACKING
A surface cracking induced by repeated bending or flexing.
FLEX LIFE
The relative ability of a rubber article to withstand dynamic
bending stresses.
FLOCK
Fibers added to rubber Compounds.
FLOW CRACKS
Surface imperfections due to improper flow and failure of stock to
knit or blend with itself during the molding operation.
FRICTION
Resistance to motion due to the contact of surfaces.
FRICTION, BREAKOUT
Initial or starting friction developed when employed as a dynamic
seal.
FRICTION, RUNNING
Constant friction developed during operation of a dynamic O-
Ring
FUEL, AROMATIC
Fuel which contains benzene or aromatic hydrocarbons.
FUEL, NON-AROMATIC
Fuel which is composed of straight chain hydrocarbons.
GLAND
Seal assembly, including O-Ring, groove which holds the O-
Ring, and contacting surfaces.
HARDNESS
Property or extent of being hard. Measured by extent of failure of
the indentor point or any one of a number of standard hardness
testing instruments to penetrate the product.
HARDNESS SHORE A
Durometer reading in degrees of the hardness of the rubber.
(Shore A hardness of 35 is soft; 90 is hard.)
HOMOGENEOUS
General - a material of uniform composition throughout.
HYCAR P.A.
Commercial name for polymer or acrylic acid ester.
HYPALON
Commercial name for chlorosulphonated derivative of
polyethylene.
IDENTIFICATION
Colored dots or stripes on O-Rings for identification purposes.
IMMEDIATE SET
The deformation found by measurement immediately after
removal of the load causing the deformation.
IMMERSION
Placing an article into a fluid, generally so it is completely
covered.
IMPACT
The single instantaneous stroke or contact of a moving body with
another either moving or at rest, such as a large lump of material
dropping on a conveyor belt.
LIFETEST
A laboratory procedure used to determine the amount and
duration of resistance of a rubber article to a specific set of
destructive forces or conditions.
LINEAR EXPANSION
Expansion in any one linear dimension or the average of all
linear dimensions.
LOGY
Sluggish, low snap or recovery of a material.
LOWTEMPERATURE FLEXIBILITY
The ability of a rubber product to be flexed, bent or bowed at low
temperatures.
LOWTEMPERATURE FLEXING
Act or instance of repeated bending or bowing a rubber product
under conditions of low temperature.
MIRROR FINISH
A bright, polished surface.
MISALIGNMENT
Departure from alignment.
MISMATCH
Poor matching or meeting in splice.
MODULUS
Tensile stress at a specified elongation.
MODULUS OF ELASTICITY
One of the several measurements of stiffness or resistance to
deformation, but often incorrectly used to indicate specifically
static tension modulus.
MOLD CAVITY
Hollow space or cavity in the mold which is used to impart the
desired form to the product being molded.
MOLD FINISH
The uninterrupted surface produced by intimate contact of
rubber with the surface of the mold at vulcanization.