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VULCAMETRY BY MDR ACCORDING TO ISO 6502


The aim of rheometric (vulcametric) measurements is prompt determination of crosslinking (vulcanization) properties of rubber compounds. The measurements are intended for control and development of compounds possessing desired vulcanization properties at given temperature. Accredited is rheometric (vulcametric) method by the instrument MDR (Moving Die Rheometer) in accordance with ISO 6502.

Pursued is the so-called vulcametric curve, representing time dependence of rheometric torque on instrument's rotor axis within heated dies, imposed by rubber compound during crosslinking (vulcanization). The measured torque is proportional to the compond's shear modulus at a given temperature, and the latter, in turn, to the crosslink density. The torque thus increases with time, the measurement being terminated upon attainment of the torque maximum or upon elapse of the preset measurement time. Determined are the minimum and the maximum in rheometric torque, as well as characteristic times for achieving specific degrees of vulcanization (crosslink densities).


MDR: instrument for determination of rubber compound vulcanization properties   MDR: instrument for determination of rubber compound vulcanization properties (detail)

 

Vulcametric curve: Temperature (top) and torque (bottom) as a function of time

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