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MOLD MARKS
Indentations or ridges embossed into the skin of the molded
product by irregularities in the mold cavity surface.
MOLD REGISTER
Means used to align the parts of a mold.
MOONEY SCORCH
The measurement of the rate at which a rubber Compound will
precure or set up by means of the Mooney Viscometer.
MOONEYVISCOSITY
The measurement of the plasticity or viscosity of an
uncompounded or compounded unvulcanized rubber and
rubber-like materials by means of the Mooney Shearing Disk
Viscometer.
NICK
A small notch, slit, or cut.
NOMINAL LENGTH
The desired length from which tolerances are set.
NON-BLOOMING
The absence of bloom.
OIL RESISTANT
Ability of a vulcanized rubber to resist the swelling and
deteriorating effects of various type oils.
OIL SWELL
The change in volume of a rubber article due to absorption of oil.
O-RING
An elastomeric seal of homogeneous composition molded in
one piece to the configuration of a torus with circular cross-
section (doughnut). The O-Ring is used as a dynamic or static
seal usually installed in a machined groove.
OPTIMUM CURE
State of vulcanization at which maximum desired property is
attained.
OVER CURE
A degree of cure greater than the optimum.
OXIDATION
The reaction of oxygen on a rubber product, usually detected by
a change in the appearance or feel of the surface or by a change
in physical properties.
OXYGEN BOMB
A chamber capable of holding oxygen at an elevated pressure
which can be heated to an elevated temperature. Used for an
accelerated aging test.
OZONE RESISTANT
Withstands the deteriorating effects of ozone (generally
cracking).
PACKING
A flexible device used to retain fluids under pressure or seal out
foreign matter.
PACKING GROOVE
A groove carved in a flange, or in one member of a concentric
joint, to accommodate a packing.
PERMANENT SET
Permanent set is the deformation remaining after a specimen
has been stressed in tension a prescribed amount for a definite
period and released for a definite period.
PERMEABILITY
Property of rubber or other materials which permits passage of
gas through the molecular structure of the material.
PIT OR POCK MARK
A circular depression, usually small.
POLYMER
A material formed by the joining together of many (poly)
individual units (mer) of a monomer.
POROSITY
Quality of state of being porous due to presence of globular
structural voids.
REGISTER, OFF OR MISMATCH
Nonconformity of finished article with design dimensions due to
mold misalignment during cure.
RELATIVE HUMIDITY
The ratio of the quantity of water vapor actually present in the
atmosphere to the greatest amount possible at the given
temperature.
RESILIENCE
Capable of returning to original size and shape after
deformation.
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 flat.
ROUGHTRIM
Removal of superfluous parts by pulling or picking. Usually a
small portion of the flash or sprue remains attached to the
product.
RUBBER, NATURAL
Raw or crude rubber obtained from vegetable sources, basically
the Unsaturated polymer of isoprene.
RUBBER, NITRILE (BUNA N)
Copolymer of butadiene and acrylonitrile; known commercially
as Butaprene, Chemigum, Hycar OR, Perbunan and Paracril.
RUBBER, SILICONE
Semi-organic elastomer, containing silicone.
RUBBER, SYNTHETIC
Manufactured elastomers.