Glossary - H's

Hardness (r) a material’s ability to resist a distorting force (indentor point).

Heat buildup (r) the accumulation of thermal energy generated within a material as a result of hysteresis, evidenced by an increase in temperature.

Hertz (Hz) an international unit for frequency—the number of cycles per second.

Hole (sc) the absence of a valence electron in a semiconductor crystal. Motion of a hole is equivalent to motion of a positive charge.

Homogeneous having uniform composition or structure.

Homogenization (r) repeated passage of raw rubber through a mill or other mixing device, under specified conditions, to ensure uniformity.

Homopolymer (r) a polymer formed from a single monomer species.

Hybrid integrated circuit (sc) a structure consisting of an assembly of one or more semiconductor devices and a thin-film integrated circuit on a single substrate, usually ceramic.

Hydrogen bonding unusually strong dipole-dipole attractions that occur among molecules in which hydrogen is bonded to a highly electronegative atom.

Hydrophilic affinity toward water (water-loving); a hydrophilic surface is one that will allow water to spread across it in large puddles.

Hydrophobic aversion to water; a hydrophobic surface will not allow large puddles of water, but rather will form droplets. These surfaces are often termed “de-wetted.”

Hydroscopic attracts and absorbs water.

Hysteresis the lagging of strain behind stress during deformation.

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