Reinforcers: They are used for technical reasons to increase the mechanical strength of the vulcanized.
Thinners: They are used for purely economic reasons.
Polar compound: Tends to be oriented in a preferred direction by subjecting it to an electric field.
Hardness: Indicator of the stiffness of a rubber against moderate efforts. The most popular method is the Shore A, based on the measurement of the penetration of a frustoconical tip against the reaction of a calibrated metal spring.
Extrusion: Process of forming a raw mixture, in which it is forced to pass through a nozzle in a certain way, driven by the rotation of a screw in a cylindrical chamber.
Hysteresis: Fraction of energy supplied to produce a deformation that is absorbed by the rubber and transformed into heat. It is the complement of resilience.
Injection: Introduction of a pressure mixture into the cavity of a previously closed mold. The injection unit also performs a previous plasticization and heating of the mixture, before its introduction into the mold.
Compression molding: Introduction of an adequate amount of mixture into the cavity of a mold, then the mold is closed under a compression force, whereby the mixture is distributed and fills the cavity of the mold.
Polymer: Material resulting from the chemical union of a large number of molecules of one or several simpler chemicals (monomers). If it is constituted by a single monomer it is called homopolymer, by two different copolymer monomers, by three different terpolymer monomers.
Post-curing / post-vulcanization: Thermal treatment after vulcanization to eliminate undesirable products from it.
Rheometer: Instrument used to evaluate the behavior of the material during vulcanization.
Resilience: Relationship between the energy restored after a deformation and the total energy supplied to produce said deformation.
Vulcanization / Curing: Transformation of a relatively plastic material (raw rubber), in a highly elastic material (vulcanized rubber).