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A_B_C_D_E_F_G_H_I_J_K_L_M_N_O_P_Q_R_S_T_U_V_W_X_Y_Z
ACCELERATED AGING: Simulated
aging designed to predict the performance of an adhesive after natural
aging, typically by using heat, UV radiation and moisture alone
or in combination.
ACRYLIC ADHESIVE: Adhesive
made from acrylic monomers that have been polymerized. They have
good resistance to UV radiation, plasticizer and extreme temperatures.
BLOOM: A coating or
efflorescence creating a discoloration or change in appearance of
the surface of a rubber product caused by the migration of a liquid
or solid to the surface. Examples: Sulfur Bloom, Wax Bloom. Not
to be confused with dust on the surface from external sources.
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BLOWING AGENT: Mixed
with a rubber compound, this material decomposes when heated to
form the gases that create sponge rubber.
CELLULAR RUBBERS: Rubber products that contain
cells or small hollow receptacles. The cells may either be open
or interconnecting or closed and not interconnecting.
CI: The abbreviation for cloth-inserted,
indicating a sheet of rubber containing one or more plies of fabric
covered with rubber.
CLOSED CELL: A cell totally enclosed
by its walls and hence not interconnecting with other cells.
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COMPOUND: An uncured
mixture of a rubber polymer and other ingredients (fillers, vulcanizing
agent, etc.).
COMPRESSION SET: The deformation which remains in rubber
after it has been subjected to and released from a specific compressive
stress for a definite period of time at a prescribed temperature.
Compression set measurement is for the purpose of evaluating creep
and stress relaxation properties of rubber.
CONFORMABILITY: The ability of an
adhesive tape to mold itself to the shape of an object without wrinkling
or creasing.
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CREEP RELAXATION: In a flange gasket,
loss of stress accompanied by constantly decreasing compressed thickness.
This type of relaxation is encountered in bolted flange joints.
CROSSLINKED: The establishment of
a chemical bond between the molecular chains of a given polymer,
thereby enhancing physical properties.
DENSITY: The weight
per unit volume of a material – usually expressed in PCF (pounds
per cubic foot).
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DOUBLE-COATED: Tape
with adhesive on both sides.
DUROMETER: An instrument for measuring
the indentation hardness of rubber; also, sometimes used as a synonym
for hardness.
ELASTOMER:
A macromolecular material which, in the vulcanized state, at room
temperature can be stretched repeatedly to at least twice its original
length and which, upon release of the stress, will immediately return
to approximately its original length.
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ELONGATION: An increase
in length expressed numerically as a fraction or percentage of the
initial length.
EXPANDED RUBBER: Cellular rubber having closed cells made
from a solid rubber compound.
GASKET (Mechanical):
A deformable material clamped between essentially stationary faces
to prevent the passage of matter through an opening or joint.
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KISS-CUT:
Die-cutting material so that it stays in roll form. The finished
pieces are easily peeled from the release liner.
LAMINATE:
Product made by bonding together two or more layers of like,
or unlike materials.
LINER SIDE: The adhesive side covered
by the release liner.
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MILS:
Thousandths of an inch.
MONOMER: A simple chemical compound that enters into the
production of a polymer.
OPEN CELL:
A cell not totally enclosed by its walls and hence interconnecting
with other cells.
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PATTERN COATING:
Adhesive applied in patterns in the machine direction causing alternating
bands of adhesive and non-adhesive areas.
PLASTICIZER: A material which,
when incorporated in rubber or a polymer, will change its hardness,
flexibility, process-ability and plasticity.
POLYMER: Material made from chains
of identical molecules (monomers). The basis of most plastics and
adhesives.
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PRESSURE SENSITIVE:
Adhesive that can be applied to a substrate by using light pressures.
RELEASE LINER: Coated paper
applied to the adhesive to protect it until ready for use.
REMOVABLE ADHESIVE: Adhesive that can be removed from a surface
without leaving a residue.
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RUBBER: A material that
is capable of recovering from large deformations quickly and forcibly,
and can be, or already is, modified to a state in which it is essentially
insoluble (but can swell) in boiling solvent, such as benzene, methyl
ethyl ketone, and ethanol-toluene azeotrope. A rubber in its modified
state, free of diluents, retracts within 1 minute to less than 1.5
times its original length after being stretched at room temperature
(18 to 29oC) twice its length and held for 1 minute before release.
RUBBER BASED ADHESIVE: Made from natural and synthetic rubber
compounds. They have excellent initial tack but low temperature
and aging resistance.
SILICONE ADHESIVE: Adhesives made from silicone
polymers that have excellent high temperature resistance.
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SPONGE RUBBER: Cellular
structure produced by adding gasifying substance to rubber compound,
expanding and curing in heated mold. Cells may be open (interconnecting)
or closed.
SURFACE ENERGY: Characteristic
of a substrate surface affecting bonding of an adhesive. The higher
it is, the better an adhesive bonds. Can be increased by Corona
treatment.
TACK: The stickiness
of a tape.
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TENSILE STRENGTH: The
maximum tensile stress applied while stretching a specimen to rupture.
THERMOPLASTIC RUBBER: Rubber that does not require chemical
vulcanization and will repeatedly soften when heated and stiffen
when cooled; and which will exhibit only slight loss of its original
characteristics.
THERMOSETTING RUBBER: Chemically vulcanized rubber that cannot
be remelted or remolded without destroying its original characteristics.
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TRANSFER TAPE: An unsupported
adhesive on a liner.
UL94: Underwriters
Laboratory’s rating for flame spread.
VULCANIZATION:
An irreversible process during which a rubber compound through a
change in its chemical structure (for example, cross-linking) becomes
less plastic and more resistant to swelling by organic liquids and
elastic properties are conferred, improved, or extended over a greater
range of temperature.
WATER
ABSORPTION: Measurement of water absorbed by flexible cellular
materials during submersion in water under pressure.
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