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Glossary



Tack

Stickiness of an adhesive or filament reinforced resin prepreg material.


Tenacity

The term generally used in yarn manufacture and textile engineering to denote the strength of a yarn or of a filament of a given size. Numerically it is the grams of breaking force per denier unit of yarn or filament size; grams per denier, gpd. The yarn is usually pulled at the rate of 12 inches per minute. Tenacity equals breaking strength (grams) divided by denier.


Tension Device

A mechanical or magnetic device that controls tension.


Tex

A unit for expressing linear density, equal to the mass in grams of 1 km of yarn, filament, fibre or other textile strand.


Texturised Glass Yarn

A yarn processed from continuous filament yarn in such a manner to induce bulk to the yarn by disorientation of the filaments.


Thermoplastic

Capable of being repeatedly softened by an increase of temperature and hardened by an increase 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 moulding or extrusion.


Thermoset

A material that will undergo a chemical reaction caused by heat, catalyst, etc., leading to the formation of a solid. Once it becomes a solid, it cannot be reformed.


Thickeners

Material added to the resin to thicken it or raise the viscosity index of the resin so that it will not flow as readily.


Thixotropic, Thixotropy

Concerning materials that are gel-like at rest but fluid when agitated.


Thread Count

The number of yarns (threads) per inch in either the lengthwise (warp) or crosswise (fill or weft) direction of woven fabrics.


Tow

An untwisted bundle of continuous filaments (usually carbon) usually designated by a number followed by K, indicating multiplication by 1,000 (for example, 12K tow has 12,000 filaments).


Tracer

A fibre, tow, or yarn added to a prepreg for verifying fibre alignment and, in the case of woven materials, for distinguishing warp fibres from fill fibres.

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