GLOSSARY OF TERMS
T

Tack: surface stickiness.

Tack Free: surface which is not sticky after cure.

Tangent Modulus: slope of the line at a predefined point on a static stress-strain curve, expressed in force per unit area per unit strain. This is the tangent modulus at that point in shear, tension, or compression, as the case may be. See also secant modulus.

Tape: narrow width reinforcing fabric or mat.

Tensile Elongation: engineering term referring to the amount of stretch a sample experiences during tensile strain.

Tensile Load: load applied away from and to opposite ends of a given sample.

Tensile Modulus: When a bar is pulled in tension, it has to get longer. The tensile modulus is used to calculate how much longer it will get when a certain load is applied to it. Units are normally millions of pounds per square inch. (10 6 psi) - Giga Pascals (gPa). Higher numbers indicate materials which will not elongate as much as others when they are being compared under equal tensile loading conditions.

Tensile Strength: how large a non-moving load a bar can withstand before it breaks due to elongation. Units are normally thousands of pounds per square inch. (103 psi) - Mega Pascals (mPa). Higher numbers indicate materials which can withstand a stronger pull before breaking.

Tensile Stress: normal stress caused by forces directed away from the plane on which they act.

Thermal Coefficient of Expansion: see Coefficient of Thermal Expansion.

Thermal Conductivity: measures the transfer of heat through a material.

Thermoplastic: capable of being repeatedly softened by an increase of temperature and hardened by a decrease in temperature. Applicable to those materials whose change upon heating is substantially physical rather than chemical and that in the softened stage can be shaped by flow into articles by molding or extrusion.

Thermoplastic Polyesters: class of thermoplastic polymers in which the repeating units are joined by ester groups. The two important types are (1) polyethylene terephthalate (PET), which is widely used as film, fiber, and soda bottles; and (2) polybutylene terephthalate (PBT), primarily a molding compound.

Thermoset: plastic that, when cured by application of heat or chemical means, undergoes an irreversible change.

Thermosetting Polyesters: class of resins produced by dissolving unsaturated, generally linear, alkyd resins in a vinyl-type active monomer such as styrene, methyl styrene, or diallyl phthalate. Cure is effected through vinyl polymerization using peroside catalysts and promoters or heat to accelerate the reaction. The two important commercial types are (1) liquid resins that are cross-linked with styrene and used either as impregnants for glass or carbon fiber reinforcements in laminates, filament-wound structures, and other built-up constructions, or as binders for chopped-fiber reinforcements in molding compounds, such as sheet molding compound (SMC), bulk molding compound (BMC), and thick molding compound (TMC); and (2) liquid or solid resins cross-linked with other esters in chopped-fiber and mineral-filled molding compounds, for example, alkyd and diallyl phthalate.

Tooling Gel Coat: gel coat formulated for mold surfaces.

Translucent: permits a percentage of light to pass but not optically clear like window glass.

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