Abstract: A rotational rheometer has a cylindrical outer housing into which a measuring container can be inserted substantially coaxially thereby forming a radial annular space. The measuring container has a measuring chamber for receiving a sample material. A fluid may flow through the annular space to bring the outside of the measuring container and thereby the sample material to a desired temperature. The fluid is a gas and a circulating device is provided within the outer housing for circulating the gas.

Abstract: In a method for continuous or discontinuous measurement of shear and strain viscosities of Newtonian and non-Newtonian liquids, in particular structurally viscous liquids such as polymer melts and solutions and elastomers as well as other structural liquids, the liquid is passed through a first capillary or capillary configuration and through a second capillary connected in series therewith, wherein the liquid in the first capillary or capillary configuration shears only within a defined shear velocity range and the shear viscosity is determined, and, subsequently, the liquid in the second capillary having the same or somewhat smaller shear velocity range, shears and is additionally subjected to a strain-flow so that its flow-through resistance comprises shear as well as strain resistances.