The approximate midpoint of the temperature range at which a non-crystalline (amorphous) polymer changes from brittle (glass) to rubbery.

The temperature at which a material changes from a soft, rubbery state to a more brittle state.

The temperature at which the transition in the amorphous regions between the glassy and rubbery state occurs.

(extended definition) Temperature point where a polymer experiences a significant change in properties. The polymer structure turns to glassy and visco-elastic states. Below Tg even segmental movement in polymer molecules is restricted, and polymers become rigid and sometimes even brittle bodies. Above Tg polymers are rubber-like.

the temperature below which the material is "glassy" or rigid and above which is "rubbery" or ductile.

is the temperature at which a food product changes from a rubbery state to a solid glassy state.

The inflection point on a modulus vs. temperature plot at which properties significantly decrease.

Temperature at which a glass changes from a supercooled liquid into a solid.

amorphous regions of a thermoplastic soften at this temperature (Tg)

The temperature at which a reversible change occurs in an amorphous polymer when it is heated to a certain temperature and undergoes a rather sudden transition from a hard, glassy, or brittle condition to a flexible or elastomeric condition.

That temperature at which, upon cooling, a noncrystalline ceramic or polymer transforms from a supercooled liquid to a rigid glass.

The temperature at which an amorphous polymer (or the amorphous regions in a partially crystalline polymer) changes from a hard and relatively brittle condition to a viscous or rubbery condition. When this transition occurs, many physical properties undergo significant changes. Some of those properties are hardness, brittleness, coefficient of thermal expansion, and specific heat.

the temperature at which a polymer changes from hard and brittle to soft and pliable.

Term that reflects the temperature when a substance changes from a hard glass to a rubber consistency. Polymers become weak at temperatures below their transition temperature.

The Tg of a resin system is the temperature at which the material transforms from a relatively rigid or glassy state to a more deformable or softened state.

It is the point at which the polymer hardens into an amorphous solid.

The critical temperature at which a polymer will lose the properties of glass and obtains the properties of an elastomer.

The TG can loosely be defined as a temperature point where a polymer experiences a significant change in properties. Typically, a large change in Young's Modulus is experienced. The TG is where a polymer structure turns "rubbery" upon heating and "glassy" upon cooling. Amorphous polymers are structural below TG . Amorphous materials go through one stage of the change from a glassy to a rubbery consistency with a simultaneous loss in stiffness (modulus of elasticity or Young's Modulus). This stage of going from stiff to flowing is over a wide temperature range. Crystalline, materials, on the other hand, go through a stage of becoming leathery before becoming rubbery. There is a loss of stiffness (modulus of elasticity or Young's Modulus) in both of these stages. However, crystalline materials have a sharp, defined melting point.

Approximate midpoint of the temperature range over which a material undergoes a phase change from brittle to rubbery or vice versa.

The temperature region in which the glass transition occurs. (See Glass transition.) The measured value of the glass transition temperature depends to some extent on the method of test.

See SECOND-ORDER TRANSITION TEMPERATURE.

(pronounced "T sub g") The temperature at which a polymer changes from a hard and relatively brittle condition to a viscous or rubber condition. This transition generally occurs over a relatively narrow temperature range. Although there is no phase transition, in this temperature region many physical properties (such as hardness, brittleness, thermal expansion and specific heat) undergo significant and rapid changes. Glass transition temperature is also used as a shorthand way of indicating the temperature at which the mechanical and electrical properties of a laminate begin to degrade

The glass transition temperature is the temperature, below which the physical properties of amorphous materials vary in a manner similar to those of a crystalline phase (glassy state), and above which amorphous materials behave like liquids (rubbery state). A material’s glass transition temperature, Tg, is the temperature below which molecules have little relative mobility. Tg is usually applicable to wholly or partially amorphous phases such as glasses and plastics.