Glossary - R's
Radial clearance (r) the difference in the radial dimensions between the sealing surfaces of a radial seal.
Radicals atoms or polyatomic molecules with at least one unpaired electron.
RCA Clean (sc) a multi-step wet chemical process to clean wafers before oxidation; named after RCA, the company that invented the procedure.
Reactive ion etching (RIE) (sc) an etching process that combines plasma and ion beam removal of the surface layer. The etchant gas enters the reaction chamber and is ionized. The individual molecules accelerate to the wafer surface. At the surface, the top layer removal is achieved by the physical and chemical removal of the material.
Recipe (r) a formula, mixing procedure and any other instructions needed for the preparation of a product.
Recovery (r) the degree to which a rubber product returns to its normal dimensions after being distorted.
Reinforcement (r) the act of increasing the mechanical performance capability of a rubber by the incorporation of materials that do not participate significantly in the vulcanization process.
Release agent (mold) (r) a substance applied to the inside surfaces of a mold or added to a material to be molded, to facilitate removal of the product from the mold.
Resilience (r) the ratio of energy output to energy input in a rapid (or instantaneous) full recovery of a deformed specimen.
Resilience, impact (r) the ratio of output to input mechanical energy in a rapid deformation and recovery cycle of a rubber specimen.
Resistivity, volume the ratio of the electric potential gradient to the current density when the gradient is parallel to the current in the material.
Retarder (r) a material used to reduce the tendency of a rubber compound to vulcanize prematurely.
Reticle (sc) a reproduction of the pattern to be imaged on the wafer (or mask) by a step-and-repeat process. The actual size of the pattern on the reticle is usually several times the final size of the pattern on the wafer.
Reversion (vulcanization) (r) deterioration of vulcanizate properties that may occur when vulcanization time is extended beyond the optimum.
Rubber (r) a material that is capable of recovering from large deformations quickly and forcibly, and can be, or already is, modified to a state in which it is essentially insoluble (but can swell) in a boiling solvent such as benzene, methyl ethyl ketone or ethanol toluene azeotrope.
Rubber hardness degree, international (IRHD) (r) a measure of hardness, the magnitude of which is derived from the depth of penetration of a specified indentor into a specimen under specified conditions. The scale is so chosen that zero would represent a material showing no measurable resistance to indentation, and 100 would represent a material showing no measurable indentation.
Runner (r) the secondary feed channel for transferring material under pressure from the inner end of the sprue to the cavity gate.
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