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IMPACT RESISTANCE: The resistance of a tape to breaking
under a shock load, as in bundling application.
IMPACT STRENGTH: Refers to the strength of a length of
tape when a sudden dynamic force is applied to the tae itself.
Differs from tensile in that tensile strength is measured at a
slower rate with direct force at 180 degrees. Glass fibers or
strands have high tensile, low elongation and low Impact Strength.
Polyester threads or fibers have higher elongation, but somewhat
lower tensile strength and, thus, high Impact Strength as compared
to glass.
IMPREGNATION: Refers to the treatment of a backing (especially
paper) in which individual fibers are unified and bonded together
to improve physical and chemical characteristics of the backing.
Impregnates prevent de-lamination, increase moisture and solvent
resistance, improve tear and tensile properties. All paper tapes
are usually impregnated.
IMPRINTING: Refers to an actual mechanical impression of
a tape pattern into the surface of the material to which the tape
has been applied. Generally results from the finish being too
soft at the time the tape was applied.
INHIBITOR: A substance which slows down chemical reaction.
Inhibitors are sometimes used in certain types of adhesives to
prolong storage or working life.
INORGANIC: Refers to chemical substances not based on carbon
(carbonates, carbon oxides and carbides are exceptions, being
considered inorganic). Examples are minerals, water and air. See
"Organic".
INSULATION: Any material that inhibits the flow of electrical
current.
INSULATION RESISTANCE: The ability of a tape to resist
flow of current along its surface under specific conditions.
KAPTON FILM: See "Polyimide
Film".
KETONE: An oxygen containing solvent, often found in lacquer
finishes.
KNIFE: See "Sitter
Knife".
KODACEL FILM: A cellulose acetate transparent film.
KRAFT PAPER: A paper made from sulphate wood pulp.
KRATON: A family of synthetic rubber polymers based on
Styrene and Butadiene or Styrene and Isoprene.
